Boeing 737 MAX groundings
A parking lot at Boeing Field in Seattle, Washington, filled with undelivered Boeing 737 MAX aircraft during the grounding
Date
Duration
  • between accidents: 4 months and 10 days
  • of grounding by the FAA: 1 year, 8 months and 5 days (619 days)
CauseAirworthiness revoked after recurring flight control failure and Uncontrolled decompression
Budget
  • direct costs: US$20 billion[2]
  • indirect costs: US$60 billion[2]
Deaths346 total:

The Boeing 737 MAX passenger airliner was grounded worldwide between March 2019 and December 2020 – longer in many jurisdictions – after 346 people died in two similar crashes: Lion Air Flight 610 on October 29, 2018 and Ethiopian Airlines Flight 302 on March 10, 2019. The U.S. Federal Aviation Administration (FAA) resisted grounding the aircraft until March 13, 2019, when it received evidence of accident similarities. By then, 51 other regulators had already grounded the plane,[3] and by March 18, 2019, all 387 of the aircraft in service were grounded.

In 2016, FAA approved Boeing's request to remove references to a new Maneuvering Characteristics Augmentation System (MCAS) from the flight manual. In November 2018, after the Lion Air accident, Boeing instructed pilots to take corrective action in case of a malfunction, when the airplane would enter a series of automated nosedives. Boeing avoided revealing MCAS until pilots requested further explanation. In December 2018, the FAA privately predicted that MCAS could cause 15 crashes over 30 years. In April 2019, the Ethiopian preliminary report stated that the crew had attempted the recovery procedure, and Boeing confirmed that MCAS had activated in both accidents.[4]

FAA certification of the MAX was subsequently investigated by the U.S. Congress and multiple U.S. government agencies, including the Transportation Department, FBI, NTSB, Inspector General and special panels. Engineering reviews uncovered other design problems, unrelated to MCAS, in the flight computers and cockpit displays. The Indonesian NTSC and the Ethiopian ECAA both attributed the crashes to faulty aircraft design and other factors, including maintenance and flight crew actions. Lawmakers investigated Boeing's incentives to minimize training for the new aircraft.[5] The FAA revoked Boeing's authority to issue airworthiness certificates for individual MAX airplanes and fined Boeing for exerting "undue pressure" on its designated aircraft inspectors.

In August 2020, the FAA published requirements for fixing each aircraft and improving pilot training. On November 18, 2020, the FAA ended the 20-month grounding, the longest ever of a U.S. airliner. The accidents and grounding cost Boeing an estimated $20 billion in fines, compensation, and legal fees, with indirect losses of more than $60 billion from 1,200 cancelled orders.[6][2][7] The MAX resumed commercial flights in the U.S. in December 2020, and was recertified in Europe and Canada by January 2021.[8]

In January 2024, the FAA grounded some 737 MAX 9s with a configuration similar to that of Alaska Airlines Flight 1282 which suffered a mid-flight blowout of a plug filling an unused emergency exit, causing rapid decompression of the aircraft.

Groundings

Five Shenzhen Airlines 737 MAX 8s (foreground, red livery) grounded at the Shenzhen Bao'an International Airport, March 2019

After the Ethiopian Airlines crash, China and most other civil aviation authorities grounded the airliner over safety concerns. Other jurisdictions, including the U.S., followed suit as new evidence revealed similarities between both crashes. The groundings were ordered despite Boeing CEO Dennis Muilenburg's public assurances that the airplane was safe and a phone conversation with President Trump in which he "reiterated to the President our position that the MAX aircraft is safe", according to a Boeing statement.[9] In response to increasing domestic and international pressure to take action,[10][11][12] the U.S. Federal Aviation Administration (FAA) grounded the aircraft on March 13, 2019, reversing a Continued Airworthiness Notice issued two days prior.[13] About 30 MAX aircraft were flying in U.S. airspace at the time and were allowed to reach their destinations.[14] By March 18, every single Boeing 737 MAX plane (387 in total) had been grounded, which affected 8,600 weekly flights operated by 59 airlines across the globe.[15] Several ferry flights were operated with flaps extended to circumvent MCAS activation.

Accident investigations

Vertical airspeeds of Boeing Max 737s in 2018-2019 crashes
Vertical airspeeds of both flights, showing altitude loss in 20-second intervals.

ICAO regulations Annex 13, "Aircraft Accident and Incident Investigation", defines which states may participate in investigations. For the two MAX accidents these are:[16]

  1. Indonesia, for Lion Air Flight 610 as the state of registration, state of occurrence, and state of the operator.
  2. Ethiopia, for Ethiopian Airlines Flight 302, as the state of registration, state of occurrence, and state of the operator.
  3. The United States, as the state of manufacturer and issuer of the type certificate.

The participating state or national transportation safety bureaus are the NTSB for the US and the NTSC for Indonesia. Australia and Singapore also offered technical assistance, shortly after the Lion Air accident, regarding data recovery from the new generation flight recorders (FDR). With the exception of Ethiopia, the officially recognized countries are members of the Joint Authorities Technical Review (JATR).

Lion Air Flight 610

PK-LQP, the aircraft involved in the crash of Flight 610

Preliminary investigations revealed serious flight control problems that traumatized passengers and crew on the aircraft's previous flight, as well as signs of angle-of-attack (AoA) sensor and other instrument failures on that and previous flights, tied to a design flaw involving the Maneuvering Characteristics Augmentation System (MCAS) of the 737 MAX series. The aircraft maintenance records indicated that the AoA sensor was just replaced before the accident flight.[17] The report tentatively attributed the accident to the erroneous angle-of-attack (AoA) data and automatic nose-down trim commanded by MCAS.[18][19]

The NTSC final report, published on October 23, 2019, was prepared with assistance from the U.S. NTSB. NTSC's investigator Nurcahyo Utomo identified nine factors to the accident, saying:

"The nine factors are the root problem; they cannot be separated. Not one is contributing more than the other. Unlike NTSB reports that identify the primary cause of accidents and then list contributing issues determined to be less significant, Indonesia is following a convention used by many foreign regulators of listing causal factors without ranking them".[20][21]

The final report has been shared with families of Lion Air Flight 610, then published on October 25, 2019.[22][23][24][25]

Ethiopian Airlines Flight 302

ET-AVJ, the MAX 8 that crashed as Flight 302

On March 11, the FAA defended the MAX against groundings by issuing a Continued Airworthiness Notice to operators. The initial reports for Flight 302 found that the pilots struggled to control the airplane in a manner similar to the Lion Air flight 610 crash.[26] On March 13, 2019, the FAA announced that evidence from the crash site and satellite data on Flight 302 suggested that it might have suffered from the same problem as Lion Air Flight 610 in that the jackscrew controlling the pitch of the horizontal stabilizer of the crashed Flight 302, was found to be set in the full "nose down" position, similar to Lion Air Flight 610.[27] This further implicated MCAS as contributory to the crash.[28][29][30]

Ethiopian Airlines spokesman Biniyam Demssie said that the procedures for disabling MCAS had just been incorporated into pilot training. "All the pilots flying the MAX received the training after the Indonesia crash," he said. "There was a directive by Boeing, so they took that training."[31] Despite following the procedure, the pilots could not recover.[32]

The Ethiopian Civil Aviation Authority (ECAA) led investigations for Flight 302, and the United States Federal Aviation Administration assisted in the investigation.[33] Both flight recorders (voice and data) were recovered from the crash site on March 11, 2019.[34] The French aviation accident investigation agency BEA announced that it would analyze the flight recorders from the flight.[35] BEA received the flight recorders on March 14, 2019.[36]

On March 17, 2019, Dagmawit Moges, Ethiopia's transport minister, announced that the black box had been found and downloaded, and that the preliminary data retrieved from the flight data recorder show a "clear similarity" with those of Lion Air Flight 610 which crashed off Indonesia.[37][38] Due to this finding, some experts in Indonesia suggested that the NTSC should cooperate with Flight 302's investigation team.[39] Later on the evening, the NTSC offered assistance to Flight 302's investigation team, stating that the committee and the Indonesian Transportation Ministry would send investigators and representatives from the government to assist with the investigation of the crash.[40]

The Ethiopian Civil Aviation Authority published an interim report on March 9, 2020, one day before the March 10 anniversary of the crash.[41] Investigators tentatively concluded that the crash was caused by the aircraft's design.[42][43][44][45] On December 23, 2022 the Ethiopian Aircraft Accident Investigation Bureau published its final report on the crash, concluding the probable cause was "Repetitive and uncommanded airplane-nose-down inputs from the MCAS", due to false input from the angle of attack (AoA) sensor.[46]

Timeline

2016

A MAX 8 at Farnborough Airshow
  • March 2016, The General Manager of Boeing's 737 MAX program and the former Chief Project Engineer on the 737 MAX program both approved a redesign of MCAS to increase its authority to move the aircraft's stabilizer at low speed, in order to address "stall characteristics" requirements necessary for FAA certification. Just hours after the approval for MCAS's redesign was granted, Boeing sought, and the FAA approved, the removal of references to MCAS from Boeing's flight crew operations manual (FCOM). The FAA officials who authorized this request remained unaware of the redesign of MCAS until after the crash of the Lion Air flight.[47]

2018

PK-LQP, the 737 MAX 8 involved in the Lion Air crash.
  • January 10, The Operational Evaluation Report of the National Civil Aviation Agency of Brazil (ANAC) mentions the MCAS.[48] The FAA had approved Boeing's request to remove MCAS from differences tables and quick reference handbook (QRH);[49][50] The Operational Evaluation Report prepared by Transport Canada contained the same table as ANAC's, except the reference to MCAS.[48]
  • October 29, a 737 MAX 8 operating Lion Air Flight 610 crashed after take-off from Jakarta, killing all 189 on board. Boeing started redesigning the MCAS system right after the accident.[51]
  • November 6, Boeing issued an Operations Manual Bulletin (OMB),[52] describing a MAX-specific feature of the pitch trim system, warning that with "erroneous AoA data, the pitch trim system can trim the stabilizer nose down in increments lasting up to 10 seconds" which "can be stopped and reversed with the use of the electric stabilizer trim switches but may restart 5 seconds after" and instructed pilots to counteract it by running the Runaway stabilizer and manual trim procedure.[53] The background introduction of the bulletin states: "This bulletin directs flight crews to existing procedures to address this condition", and reminds operators to use the "existing procedures in the Runaway Stabilizer NNC [Non-Normal Checklist]" when the MAX reacts to a false stall detection.[54] This was Boeing's first public announcement about MCAS, albeit not by name.[55]
  • November 7, the FAA issued an Emergency airworthiness directive to owners and operators,[56] requiring revising the aircraft flight manual (AFM) "to provide the flight crew with runaway horizontal stabilizer trim procedures" when "repeated nose-down trim commands" are caused by "an erroneously high single AoA sensor",[53] reinforcing the Boeing bulletin.[57] The FAA directive warned that the problem was an "unsafe condition" that could result in "impact with terrain".[58] The directive informs pilots of a new function specific to MAX models : "Note: The 737-8/-9 uses a Flight Control Computer command of pitch trim to improve longitudinal handling characteristics. In the event of erroneous Angle of Attack (AOA) input, the pitch trim system can trim the stabilizer nose down in increments lasting up to 10 seconds." The FAA had removed reference to MCAS from its draft EAD.[59]
  • November 10, Boeing referred publicly for the first time to the MCAS by name in a Multi Operator Message to operators.[60][61][62] The MCAS control law, a few lines of software code in the FCC, could autonomously command nosedives, when even a single sensor failure resulted in bad data; MCAS was omitted from aircraft manuals and training,[63] therefore flight crews had no knowledge of its existence or functioning until Boeing published a bulletin on November 6.
  • November 27, the Allied Pilots Association of American Airlines had a meeting with Boeing to express concerns with the MCAS effectiveness, and was unnerved by the airframer's responses. Union president Daniel Carey later said, "The huge error of omission is that Boeing failed to disclose the existence of MCAS to the pilot community. The final fatal mistake was, therefore, the absence of robust pilot training in the event that the MCAS failed".[64] The Boeing officials acknowledged that they were considering some changes, for example preventing MCAS's repetitive activation to ensure that it only triggers once.[65]
  • December 3, the FAA Seattle Certification Office reviewed an unpublished quantitative risk assessment analysis of the MAX, prepared using the "Transport Aircraft Risk Assessment Methodology" (TARAM). The U.S. House Committee on Transportation and Infrastructure made the report public just over a year later, on December 11, 2019. In the committee's words, the report concluded that "if left uncorrected, the MCAS design flaw in the 737 MAX could result in as many as 15 future fatal crashes over the life of the fleet", predicting 2900 deaths over 30 years.[66]
  • December 17, in a presentation to the FAA, Boeing deflected blame and continued to assert that appropriate crew action would save the aircraft.[67]

2019

  • March 10, another 737 MAX 8 operating Ethiopian Airlines Flight 302 crashed shortly after take-off from Addis Ababa airport, killing all 157 on board, due to a similar faulty MCAS, initiating a worldwide flight ban for the aircraft, starting with China on March 11. This was followed in quick succession the following day, March 12 by Singapore, India, Turkey, South Korea, the European Union, Australia and Malaysia. See timeline and list of groundings by other countries & regions. The US FAA issued an affirmation of the continued airworthiness of the 737 MAX.[68]
  • March 13, the U.S. FAA was among the last to order the grounding of the 737 MAX, after claiming there was no reason: China had the most aircraft in service, 96, followed by the U.S. with 72, Canada with 39 and India with 21. The FAA issued an Emergency Order of Prohibition grounding Boeing 737 MAX airplanes, followed by a CANIC.[69]
  • March 20, EASA and Transport Canada indicated that they would conduct their own reviews of Boeing's proposed software update.[70]
  • March 27, Boeing unveiled a software update to avoid MCAS errors, which was pending certification after already being developed and tested in-flight.
  • April 5, Boeing announced it was cutting 737 production by almost a fifth, to 42 aircraft monthly, anticipating a prolonged grounding, and had formed an internal design review committee.
  • May 13, Republican Congressman Sam Graves at the House Aviation subcommittee hearing, blamed the 737 MAX crashes on poor training of the Indonesian and Ethiopian pilots; he stated that "pilots trained in the U.S. would have been successful" in handling the emergencies on both jets.[71][72]
  • June 18, IAG signed a letter of intent for 200 737 MAXs at the Paris air show, followed by Turkish SunExpress and Air Astana later in the year.
  • June 26, flight tests for the FAA uncovered a data processing issue affecting the pilots' ability to perform the "runaway stabilizer" procedure to respond to MCAS errors.
  • October 30, Boeing CEO Dennis Muilenburg testified before U.S. Congress committees, defending Boeing's safety culture and denying knowledge of internal messages in which Boeing's former chief technical pilot said he had unknowingly lied to regulators, and voiced his concerns on MCAS.
  • November 22, Boeing unveiled the first 737 MAX 10 flight-test aircraft.[63]
  • November 26, the FAA revoked Boeing's Organization Designation Authorization to issue airworthiness certificates for individual MAX airplanes.[73]
  • December 17, Boeing confirmed the suspension of 737 MAX production from January 2020.
  • December 23, Dennis Muilenburg resigned, to be replaced by board chairman David Calhoun.[63]

2020

Grounded 737 MAX aircraft at the Grant County International Airport.
  • January 7, Boeing recommended "simulator training in addition to computer based training".[74]
  • January 9, Boeing released previous messages in which it claimed no flight simulator time was needed for pilots, and distanced itself from internal emails mocking airlines and the FAA, and criticizing the 737 MAX design.
  • January 13, David Calhoun became CEO, pledging to improve Boeing's commitment to safety and transparency, and estimating the return to service in mid-2020.
  • January 21, Boeing estimated the ungrounding could begin in mid-2020.[63]
  • May 27, Boeing resumed production of the MAX at a "very gradual pace".[75]
  • June 28 to July 1, the FAA conducted flight tests with a view to recertification of the 737 MAX.[76]
  • September 16, the U.S. House of Representatives releases its concluding report, blaming Boeing and the FAA for lapses in the design, construction and certification.[77]
  • September 30, a Boeing 737 MAX test aircraft was flown by FAA administrator Stephen Dickson.[78]
  • October 16, Patrick Ky, the executive director of the European Union Aviation Safety Agency, claimed that the updated 737 MAX reached the level of safety "high enough" for EASA.[79]
  • November 18, the FAA issued a CANIC (Continued Airworthiness Notification to the International Community), subject to mandatory updates on each individual aircraft.[lower-alpha 1][80] Other regulators were expected to follow.[7][81]
  • December 9, Brazilian low-cost carrier Gol Transportes Aéreos was the first airline to resume passenger service.[82]
  • December 29, American Airlines was the first US airline to resume commercial operations.[83]

2021

Southwest Airlines remains as the 737 MAX's largest operator. This Southwest MAX 8, registered as N8749Q, is seen on approach to Harry Reid International Airport, on 8 June 2021.
  • January 7, Boeing settled to pay over $2.5 billion after being charged with fraud over the company's hiding of information from safety regulators: a criminal monetary penalty of $243.6 million, $1.77 billion of damages to airline customers, and a $500 million crash-victim beneficiaries fund.[84][85]
  • January 13, the Trinidad and Tobago Civil Aviation Authority authorized the MAX to resume flights in Trinidad and Tobago's airspace.[86]
  • January 18, Transport Canada authorized the MAX to resume flights in Canadian airspace.[87] Canadian operators must modify the aircraft to enable pilots to disable the stick shaker when it is erroneously activated, if they are certain that they understand the underlying cause.[88]
  • January 27, EASA cleared the MAX to resume service in Europe, subject to additional restrictions similar to those mandated by Transport Canada.[89] Certain approaches requiring precision navigation were however not yet approved as EASA was awaiting data from Boeing as to the aircraft's ability to maintain the required performance in the event of sensor failures.[90]
  • February 26, the Australian Civil Aviation Safety Authority lifted its ban on the MAX, accepting the return-to-service requirements set by the FAA. Australia was the first nation in the Asia-Pacific region to clear the aircraft to return to service.[91]
  • April 9, Boeing announces that it has notified 16 airlines and the FAA of a potential electrical problem. Boeing refused to say how many planes were affected but four airlines grounded nearly 70 MAX aircraft.[92]
  • August 26, the Indian Directorate General of Civil Aviation rescinds its ban on MAX airplanes in India on the condition that they meet the requirements set by the FAA and EASA.[93][94]
  • September 2, Boeing and Ethiopian Airlines reach an undisclosed out-of-court settlement, with Ethiopian Airlines announcing that the MAX could return to service in January 2022.[95] The same day, the Civil Aviation Authority of Malaysia rescinded its ban on the MAX.[96][97]
  • October 14, federal prosecutors indict former Boeing pilot Mark Forkner for fraud, stating he lied to the FAA in an attempt to obtain money from customers. Forkner is the first person to receive criminal charges in the investigation.[98]
  • December 2, China's civil aviation regulator cleared the 94 jets stored by 11 carriers in China to fly again, before resuming deliveries in early 2022 of the ~120 planes currently stored by Boeing, as over 180 countries out of 195 have lifted the grounding.[99] However, the Civil Aviation Administration of China does not give a date as to when the aircraft can begin passenger operations.
  • December 28, Indonesia's ministry of transport removes its ban on the MAX.[100]

2022

The CAAC grounded the 737 MAX in China until 13th January 2023, when Air China resumed operations of the type. This Air China MAX 8, registered as B-1225, was seen at Beijing Capital International Airport on 11 March 2019, the day after the crash of Ethiopian Airlines Flight 302.
  • February 1, Ethiopian Airlines cleared the MAX to return to service, with a demonstration flight being held the same day.[101]
  • March 23, Mark Forkner is acquitted of fraud.[102]

2023

  • January 13, China Southern Airlines returned the MAX to service.[1] In 2019, Chinese aviation authorities grounded all Boeing 737 Max over safety concerns. The planes were allowed to return to service approximately 4 years later.[103][104]
  • In April of 2023, it was revealed that US engineers had recommended grounding 737 Max immediately following the Ethiopian Airlines accident.[105]
  • December 28, the FAA revealed that Boeing had asked airlines to check newer 737 MAX aircraft for a possible loose screw in the rudder control system. The FAA wants to “closely monitor” the targeted inspections and consider additional measures if further loose or missing components are discovered. [106]

2024

  • January 5: Alaska Airlines grounds their 737 MAX 9 fleet after a door plug blows out mid-air.[107][108]
  • January 6: the FAA issues an emergency airworthiness directive (EAD) mandating inspection of door plugs on 737 MAX 9 aircraft, temporarily grounding the 171 aircraft affected.[109][110][111]
  • January 7: EASA mandates inspection of affected 737 MAX 9 aircraft under its jurisdiction.[112]
  • January 8: the FAA approved a method to comply with the January 6 EAD. They also release a statement that all affected "aircraft will remain grounded until operators complete enhanced inspections which include both left and right cabin door exit plugs, door components, and fasteners. Operators must also complete corrective action requirements based on findings from the inspections prior to bringing any aircraft back into service."[113]
  • January 8: United Airlines and Alaska Airlines confirm in statements that they found loose bolts and other installation issues in the plug doors in multiple aircraft.[114][115][116][108]
  • January 11: The FAA announces an investigation into Boeing “to determine if Boeing failed to ensure completed products conformed to its approved design and were in a condition for safe operation."[117]
  • January 12: The FAA announces that they are auditing the 737 MAX production, increase monitoring of "In-service events" and accessing the "safety risks around delegated authority and quality oversight"[118]

Type certification and return to service

Investigations in both crashes determined that Boeing and the FAA favored cost-saving solutions, but ultimately produced a flawed design of the MCAS instead.[119] The FAA's Organization Designation Authorization program, allowing manufacturers to act on its behalf, was also questioned for weakening its oversight of Boeing.

Boeing wanted the FAA to certify the airplane as another version of the long-established 737; this would limit the need for additional training of pilots, a major cost saving for airline customers. During flight tests, however, Boeing discovered that the position and larger size of the engines tended to push up the airplane nose during certain maneuvers. To counter that tendency and ensure fleet commonality with the 737 family, Boeing added MCAS so the MAX would handle similar to earlier 737 versions. Boeing convinced the FAA that MCAS could not fail hazardously or catastrophically, and that existing procedures were effective in dealing with malfunctions. The MAX was exempted from certain newer safety requirements, saving Boeing billions of dollars in development costs.[120] In February 2020, the US Justice Department (DOJ) investigated Boeing's hiding of information from the FAA, based on the content of internal emails.[121] In January 2021, Boeing settled to pay over $2.5 billion after being charged with fraud in connections to the crashes.

In June 2020, the U.S. Inspector General's report revealed that MCAS problems dated several years before the accidents.[122] The FAA found several defects that Boeing deferred to fix, in violation of regulations.[123] In September 2020, the House of Representatives concluded its investigation and cited numerous instances where Boeing dismissed employee concerns with MCAS, prioritized deadline and budget constraints over safety, and where it lacked transparency in disclosing essential information to the FAA. It further found that the assumption that simulator training would not be necessary had "diminished safety, minimized the value of pilot training, and inhibited technical design improvements".[124]

In November 2020, the FAA announced that it had cleared the 737 MAX to return to service.[125] Various system, maintenance and training requirements are stipulated, as well as design changes that must be implemented on each aircraft before the FAA issues an airworthiness certificate, without delegation to Boeing. Other major regulators worldwide are gradually following suit: In 2021, after two years of grounding, Transport Canada and EASA both cleared the MAX subject to additional requirements.[126][127]

Maneuvering Characteristics Augmentation System

The MAX uses an adjustable stabilizer, moved by a jackscrew, to provide the required pitch trim forces. Generic stabilizer illustrated.

MCAS on the 737 MAX was designed to mimic the pitching behavior of the previous generation of the series, the Boeing 737 NG, by pushing down the aircraft nose from an elevated angle of attack (AoA) by automatically adjusting the horizontal stabilizer and trim tab. The system was intended to protect pilots from inadvertently flying at too steep an angle, which could result in a stall. Boeing, however, asserted that MCAS was not an anti-stall system, as the media widely reported it to be. Pilot movement of the control column on the MAX did not disable MCAS, unlike an earlier implementation of MCAS on the U.S. Air Force Boeing 767 Tanker. During certification of the MAX, Boeing requested and received permission from the FAA to remove a description of MCAS from the aircraft manual, leaving pilots unaware of the system when the airplane entered service in 2017.[128][129] Boeing had also knowingly withheld knowledge, for at least a year before the Lion Air crash, that a system to warn of a possible AoA malfunction did not work as advertised.[130]

On November 6, 2018, Boeing published a supplementary service bulletin prompted by the first crash. The bulletin describes warnings triggered by erroneous AoA data could cause the pitch trim system to repeatedly push down the nose of the airplane and referred pilots to a "non-normal runaway trim" procedure as resolution, specifying a narrow window of a few seconds before the system would reactivate and pitch the nose down again.[131] The FAA issued an emergency airworthiness directive, 2018-23-51, on November 7, 2018, requiring the bulletin's inclusion in the flight manuals, and that pilots immediately review the new information provided.[132][133] Pilots wanted to know more about the issue, and Boeing responded by publicly naming MCAS for the first time in another message to airlines, noting that MCAS operates "without pilot input."[134][135]

In December 2018, the FAA had privately predicted that 15 MCAS-related accidents could result if the system was not redesigned. Boeing said it would revise MCAS software by April 2019 to correct any problems. The study was only revealed a year later at the December 2019 House of Representatives hearing. Stephen Dickson, who became FAA administrator during the accident investigations, testified at the hearing about his agency's response after the Lion Air accident, saying "the result was not satisfactory".[136]

After the March 2019 crash of Ethiopian Airlines Flight 302, Ethiopian investigators determined that pilots had attempted the recommended recovery procedure.[137][138] Boeing admitted that MCAS played a role in both accidents by activating when it received faulty data from an exterior AoA sensor.

In 2020, an FAA Airworthiness Directive approved design changes for each MAX aircraft, requiring input from two AoA sensors for MCAS activation, elimination of the system's ability to repeatedly activate, and allowing pilots to override the system if necessary.[139] Boeing also overhauled the computer architecture of the flight controls to provide greater redundancy. For each aircraft, the FAA would issue the airworthiness certificate, without delegation to Boeing, upon completion of an AoA sensor system test and a validation test flight.[140] The FAA also required that all MAX pilots receive MCAS-related training in flight simulators by 2021. Before the accidents, simulator training on the MAX was not required, because the FAA accepted Boeing's position that the MAX was sufficiently similar to the previous 737 series, the NG.

Reactions

Boeing expressed its sympathy to the relatives of the Lion Air Flight 610 and Ethiopian Airlines Flight 302 crash victims, while simultaneously defending the aircraft against any faults and suggesting the pilots had insufficient training, until rebutted by evidence. After the 737 MAX fleet was globally grounded, starting in China with the Civil Aviation Administration of China the day after the second crash,[141] Boeing provided several outdated return-to-service timelines, the earliest of which was "in the coming weeks" after the second crash. On October 11, 2019, David L. Calhoun replaced Dennis Muilenburg as chairman of Boeing, then succeeded Muilenburg's role as chief executive officer in January 2020.

One year after the crashes, lawmakers demanded answers from then-CEO Dennis Muilenburg in a hearing on Capitol Hill. They questioned him about the discovered mistakes leading to the crashes and also about Boeing's subsequent cover-up efforts. One important line of enquiry was how Boeing "tricked" regulators into approving sub-standard pilot training materials, especially the deletion of mentioning the critical flight stabilization system MCAS.[142] A Texas court ruled in October 2022 that the passengers killed in two 737 MAX crashes are legally considered "crime victims", which has consequences concerning possible remedies.

Airbus articulated that the crashes had been a tragedy and that it would never be good for any competitor to see a particular aircraft type having problems. Airbus reiterated that the 737 MAX grounding and backlog would not change the production volume of the competing Airbus A320neo family as these aircraft had already been sold out through 2025 and logistical and supplier capacities could not be easily enhanced short to medium term in this industry.

Pilots' and flight attendants' opinions were mixed, with some expressing confidence in the certification renewal, while others were increasingly disappointed that Boeing had knowingly concealed the existence and the risks of the newly introduced flight stabilization system MCAS to the 737 series as more and more internal information about the development and certification process came to light. Retired pilot Chesley Sullenberger criticized the aircraft design and certification processes and reasoned that relationship between the industry and its regulators had been too "cozy".

Financial and economic effects

The Boeing 737 MAX groundings have had a deep financial effect on the aviation industry and a significant effect on the national economy of the United States. No airline took delivery of the MAX during the groundings. Boeing slowed MAX production to 42 aircraft per month and halted MAX production from January to May 2020. Boeing suffered directly through increased costs, loss of revenue, reputational damage, victim litigation, client compensation, reduced credit rating, and decreased stock value. In January 2020, the company estimated a loss of $18.4 billion for 2019, and it reported 183 canceled MAX orders for the year.

In February 2020, the COVID-19 pandemic and resulting travel bans created further uncertainty for Boeing. In March 2020, news that Boeing was seeking a $60 billion bailout caused a steep drop in its stock price, though Boeing eventually received $17 billion in funds from the coronavirus stimulus.[143] Its extensive supply chain providing aircraft components and flight simulators suffered similar losses, as did the aircraft services industry, including crew training, the aftermarket, and the aviation insurance industry. Major flight simulator supplier CAE increased production of simulators for the Boeing 737 MAX in anticipation of a jump in demand for pilot training in November 2019.[144] At the time of the recertification by the FAA in November 2020, Boeing's net orders for the 737 MAX were down by more than 1,000 aircraft,[6] 448 orders canceled and 782 orders removed from the backlog because they are no longer certain enough to rely on; the total estimated direct costs of the MAX groundings were US$20 billion and indirect costs over US$60 billion.[145] On January 7, 2021, Boeing settled to pay over $2.5 billion after being charged with fraud.[84][85]

In September 2021, PBS released Boeing's Fatal Flaw, a Frontline documentary about how Boeing ignored critical safety issues with the 737 MAX resulting in the crash of two airliners.[146]

In February 2022, Netflix released Downfall: The Case Against Boeing, a documentary about the two plane crashes[147] directed by Rory Kennedy.[148]

See also

Notes

  1. ↑ install new flight control computer software and new display system software; incorporate certain Airplane Flight Manual flightcrew operating procedures; modify horizontal stabilizer trim wire routing installations; conduct an angle of attack sensor system test; and conduct an operational readiness flight

References

  1. 1 2 Yu, Sophie; Freed, Jamie (January 13, 2023). "Boeing 737 MAX makes first passenger flight in China since March 2019". Reuters. Retrieved January 13, 2023.
  2. 1 2 3 Isidore, Chris (November 17, 2020). "Boeing's 737 Max debacle could be the most expensive corporate blunder ever". CNN. Archived from the original on December 21, 2020. Retrieved December 21, 2020.
  3. ↑ "Editorial: Why was the FAA so late to deplane from Boeing's 737 Max?". Los Angeles Times. March 14, 2019. Archived from the original on July 20, 2021. Retrieved July 20, 2021.
  4. ↑ Paris, Francesca; Romo, Vanessa (April 4, 2019). "Preliminary Crash Report Says Ethiopian Airlines Crew Complied With Procedures". NPR. Archived from the original on March 3, 2021. Retrieved May 28, 2021.
  5. ↑ Rucinski, David Shepardson, Tracy (October 30, 2019). "U.S. lawmakers question Boeing's $1 mln rebate clause for Southwest 737 MAX orders". Reuters. Archived from the original on February 7, 2021. Retrieved January 28, 2021.{{cite news}}: CS1 maint: multiple names: authors list (link)
  6. 1 2 "FAA clears Boeing 737 Max to fly again 20 months after grounding over deadly crashes". November 18, 2020. Archived from the original on November 18, 2020. Retrieved November 18, 2020.
  7. 1 2 Gates, Dominic (November 18, 2020). "Boeing 737 MAX can return to the skies, FAA says". Archived from the original on November 30, 2020. Retrieved November 18, 2020.
  8. ↑ "EU to Clear 737 MAX to Fly in January". The American Machinist. November 23, 2020.
  9. ↑ Zeleny, Jeff; Schouten, Fredreka (March 12, 2019). "Trump speaks to Boeing CEO following tweets on airline technology". CNN. Retrieved December 19, 2019.
  10. ↑ Shih, Gerry (March 12, 2019). "China's ban on the Boeing 737 Max inspires others, ramps up pressure on U.S. regulator". The Washington Post.
  11. ↑ Frost, Natasha (March 13, 2019). "The US is increasingly alone in not grounding the Boeing 737 Max". Quartz. Retrieved February 24, 2020.
  12. ↑ "U.S. Senate to hold crash hearing as lawmakers urge grounding Boeing 737 MAX 8". Reuters. March 12, 2019.
  13. ↑ Kaplan, Thomas; Austen, Ian; Gebrekidan, Selam (March 13, 2019). "U.S. Grounds Boeing Planes, After Days of Pressure". The New York Times. Retrieved March 14, 2019.
  14. ↑ "Boeing 737 Max 8 planes grounded after Ethiopian crash". CNN. March 13, 2019. Retrieved March 15, 2019.
  15. ↑ Lu, Denise; Mccann, Allison; Wu, Jin; Lai, K.K. Rebecca (March 13, 2019). "From 8,600 Flights to Zero: Grounding the Boeing 737 Max 8". The New York Times. Retrieved December 24, 2019.
  16. ↑ ICAO fact sheet: Accident investigation (PDF). ICAO. 2016. Archived (PDF) from the original on September 30, 2019. Retrieved January 4, 2020.
  17. ↑ Langewiesche, William (September 18, 2019). "What Really Brought Down the Boeing 737 Max?". The New York Times Magazine. Archived from the original on May 10, 2020. Retrieved September 18, 2019.
  18. ↑ "Boeing Statement on Lion Air Flight 610 Preliminary Report" (Press release). Boeing. November 27, 2018. Archived from the original on June 20, 2019. Retrieved March 13, 2019.
  19. ↑ Picheta, Rob (March 10, 2019). "Ethiopian Airlines crash is the second disaster involving Boeing 737 MAX 8 in months". CNN. Archived from the original on September 11, 2019. Retrieved March 11, 2019.
  20. ↑ Pasztor, Andy; Tangel, Andrew (September 22, 2019). "Indonesia to Fault 737 MAX Design, U.S. Oversight in Lion Air Crash Report". The Wall Street Journal. Archived from the original on September 23, 2019. Retrieved September 23, 2019.
  21. ↑ Liebermann, Oren (October 25, 2019). "Investigators spread blame in Lion Air crash, but mostly fault Boeing and FAA". CNN.
  22. ↑ Pasztor, Andy; Otto, Ben; Tangel, Andrew (October 25, 2019). "Boeing, FAA and Lion Air Failures Laid Bare in 737 MAX Crash Report". The Wall Street Journal. Archived from the original on January 26, 2021. Retrieved October 25, 2019.
  23. ↑ "Boeing expects 737 Max to fly again by New Year". BBC News Online. October 23, 2019. Archived from the original on October 23, 2019. Retrieved October 23, 2019.
  24. ↑ "Boeing fires commercial planes boss as 737 MAX crisis deepens: SKY". sky. October 23, 2019. Archived from the original on October 23, 2019. Retrieved October 23, 2019.
  25. ↑ Aircraft Accident Investigation Report - Update. Final Report (Aviation Division) (PDF). PT. Lion Mentari Airlines. October 25, 2019. Archived (PDF) from the original on October 25, 2019. Retrieved October 25, 2019. {{cite book}}: |work= ignored (help)
  26. ↑ "U.S. Joins Other Nations in Grounding Boeing Plane". The New York Times. March 13, 2019. Archived from the original on March 16, 2019. Retrieved March 16, 2019.
  27. ↑ "Piece Found at Boeing 737 Crash Site Shows Jet Was Set to Dive". Bloomberg News. March 14, 2019. Archived from the original on March 15, 2019. Retrieved March 18, 2019.
  28. ↑ Nicas, Jack; Kaplan, Thomas; Glanz, James (March 15, 2019). "New Evidence in Ethiopian 737 Crash Points to Connection to Earlier Disaster". The New York Times. Archived from the original on March 16, 2019. Retrieved March 16, 2019.
  29. ↑ Glanz, James; Lai, K.K. Rebecca; Wu, Jin (March 13, 2019). "Why Investigators Fear the Two Boeing 737s Crashed for Similar Reasons". The New York Times. Archived from the original on March 15, 2019. Retrieved March 16, 2019.
  30. ↑ Lazo, Luz; Schemm, Paul; Aratani, Lori (15 March 2019). "Investigators find 2nd piece of key evidence in crash of Boeing 737 Max 8 in Ethiopia". The Washington Post. Archived from the original on 17 March 2019. Retrieved 16 March 2019.
  31. ↑ Schemm, Paul (March 13, 2019). "Ethiopian pilots received new training for 737 Max after Indonesian crash". The Washington Post. Archived from the original on March 19, 2019. Retrieved March 20, 2019.
  32. ↑ Gates, Dominic (April 3, 2019). "Why Boeing's emergency directions may have failed to save 737 MAX". The Seattle Times. Archived from the original on March 13, 2021. Retrieved January 26, 2022.
  33. ↑ Siddiqui, Faiz (March 10, 2019). "U. S. authorities to assist in investigation of Ethiopian Airlines crash that killed 157". The Washington Post. Archived from the original on March 11, 2019. Retrieved January 24, 2020.
  34. ↑ McKirdy, Euan; Berlinger, Joshua; Levenson, Eric (March 10, 2019). "Ethiopian Airlines plane crash". CNN. Archived from the original on March 11, 2019. Retrieved January 24, 2020.
  35. ↑ Hepher, Tim (March 13, 2019). "France to analyze Ethiopian Airlines flight recorders: spokesman". Reuters. Archived from the original on March 14, 2019. Retrieved January 26, 2022.
  36. ↑ Kiernan, Kristy. "The Black Boxes From Ethiopian Flight 302: What's On Them And What Investigators Will Look For". Forbes. Archived from the original on March 15, 2019. Retrieved January 26, 2022.
  37. ↑ "Data on Ethiopia crash: 'Clear similarity' to Indonesia crash". Politico. March 17, 2019. Archived from the original on March 27, 2019. Retrieved January 24, 2020.
  38. ↑ Schemm, Paul (March 17, 2019). "'Black box' data show 'clear similarities' between Boeing jet crashes, official says". The Washington Post. Archived from the original on March 18, 2019. Retrieved March 18, 2019 – via Los Angeles Times.
  39. ↑ Mohammad Azka, Rinaldi (13 March 2019). "Alasan KNKT Minta Dilibatkan Menginvestigasi Tragedi Ethiopian Airlines" [Reasons NTSC Asked To Be Involved In Investigating Ethiopian Airlines Tragedy] (in Indonesian). Bisnis. Archived from the original on 15 March 2019. Retrieved 24 September 2019.
  40. ↑ Rosana, Christy (14 March 2019). "KNKT Tawarkan Bantuan Investigasi Kecelakaan Ethiopian Airlines" [NTSC Offers Ethiopian Airlines Accident Investigation Assistance] (in Indonesian). Tempo. Archived from the original on 15 March 2019. Retrieved 24 September 2019.
  41. ↑ "Aircraft Accident Investigation Bureau Interim Report" (PDF). Ethiopian Civil Aviation Authority, Ministry of Transport (Ethiopia). March 9, 2020. Archived (PDF) from the original on March 10, 2020. Retrieved March 26, 2020.
  42. ↑ Levin, Alan (March 7, 2020). "Boeing Set to Get Blame in Ethiopian Report on Crash of 737 Max". Bloomberg.
  43. ↑ Marks, Simon; Dahir, Abdi Latif (March 9, 2020). "Ethiopian Report on 737 Max Crash Blames Boeing". The New York Times. ISSN 0362-4331. Archived from the original on March 11, 2020. Retrieved March 11, 2020.
  44. ↑ Ranter, Harro. "ASN Aircraft accident Boeing 737 MAX 8 ET-AVJ Addis Ababa-Bole Airport (ADD)". aviation-safety.net. Retrieved August 9, 2022.
  45. ↑ "Tensions Brewing Between Ethiopia, U.S. in 737 Max Crash Probe". Bloomberg. March 10, 2021. Archived from the original on March 11, 2021. Retrieved March 28, 2021.
  46. ↑ "Aircraft Accident Investigation Report B737- MAX 8, ET-AVJ" (PDF). Ethiopian Civil Aviation Authority, Ministry of Transport (Ethiopia). December 23, 2022. Retrieved December 28, 2022 – via The Aviation Herald.
  47. ↑ Final Committee Report on the Design, Development, and Certification of the Boeing 737 MAX (Report). The House Committee on Transportation and Infrastructure. September 15, 2020. p. 20, Executive Summary.Public Domain This article incorporates public domain material from websites or documents of the United States House of Representatives.
  48. 1 2 "Flight control feature of Boeing 737 MAX under scrutiny after Lion Air accident". Aviation Safety Network. November 13, 2018. Archived from the original on January 17, 2021. Retrieved January 6, 2021.
  49. ↑ "The Boeing 737 MAX: examining the design, development, and marketing of the aircraft" (PDF). Hearing before the committee on transportation and infrastructure house of representatives. U.S. government publishing office. August 30, 2019. p. 134. Archived (PDF) from the original on January 17, 2021. Retrieved January 6, 2021. the Maneuver Characteristics Augmentation System (MCAS) flight control law was not originally included In the 737 NG to 737 MAX differences tables nor was a specific reference included in the FCOM/QRH
  50. ↑ Brady, Chris. "737 MAX - MCAS". The Boeing 737 Technical Site. Retrieved January 6, 2021. Flight Standardisation Board (FSB) : The purpose of this revision is to add the B-737-7, B-737-8200, and ...(MCAS). ... the Design Differences Table from the Boeing 737-800 to the Boeing 737-8 is revised to include ATA 27 Flight Controls addition of MCAS.
  51. ↑ per Mr Bahrami's testimony, reported in the House FINAL COMMITTEE REPORT: BOEING 737 MAX, section 9, Post-Accident Response
  52. ↑ "Boeing Statement on Operations Manual Bulletin" (Press release). Boeing. November 6, 2018. Archived from the original on January 8, 2021. Retrieved January 6, 2021.
  53. 1 2 "Boeing nearing 737 Max fleet bulletin on AoA warning after Lion Air crash". The Air Current. November 7, 2018. Archived from the original on October 13, 2019. Retrieved July 10, 2019.
  54. ↑ "Final Committee Report on the Design, Development, and Certification of the Boeing 737 MAX". The House Committee on Transportation and Infrastructure. September 2020. pp. 193–194, 210. Archived from the original on January 8, 2021. Retrieved January 6, 2021.
  55. ↑ Campbell, Darryl (May 2, 2019). "The many human errors that brought down the Boeing 737 Max". The Verge. Archived from the original on January 21, 2021. Retrieved January 6, 2021.
  56. ↑ "Emergency Airworthiness Directive (AD) 2018-23-51" (PDF). FAA. November 7, 2018. Archived (PDF) from the original on March 24, 2020. Retrieved March 23, 2020.
  57. ↑ Beech, Hannah; Bradsher, Keith (November 7, 2018). "In Indonesia Plane Crash Inquiry, New Focus on Possible Aircraft Problems". The New York Times. ISSN 0362-4331. Archived from the original on January 9, 2021. Retrieved January 4, 2021.
  58. ↑ "FAA Airworthiness Directive" (PDF). Federal Aviation Administration. Archived (PDF) from the original on January 24, 2021. Retrieved January 27, 2021.
  59. ↑ See House report
  60. ↑ The message, MOM-MOM-18-0655-01B, is included in the Lion Air Accident Report.
  61. ↑ Hradecky, Simon (January 14, 2019). "Crash: Lion B38M near Jakarta on Oct 29th 2018, aircraft lost height and crashed into Java Sea, wrong AoA data". The Aviation Herald. Archived from the original on March 9, 2021. Retrieved January 26, 2022. On Nov 10th 2018 Boeing sent out multi-operator messages informing operators about the MCAS
  62. ↑ "Boeing 737 MAX crisis: a timeline (Part I)". aerotime.aero. July 22, 2019.
  63. 1 2 3 4 Graham Dunn (March 13, 2020). "Timeline of the twists and turns in the grounding of the Boeing 737 Max". Flightglobal. Archived from the original on July 27, 2020. Retrieved March 14, 2020.
  64. ↑ "Pilot Union President to Call for Accountability from Boeing and Reassessment of FAA Certification Process" (Press release). Allied Pilots Association. June 17, 2019.
  65. ↑ House committee final report
  66. ↑ Jon Hemmerdinger, Boston (December 12, 2019). "FAA 2018 analysis warned of 15 fatal Max crashes months before second accident". Flightglobal. Archived from the original on February 13, 2020. Retrieved March 14, 2020.
  67. ↑ "After Lion Air crash, Boeing doubled down on faulty 737 MAX assumptions". The Seattle Times. November 8, 2019. Archived from the original on November 9, 2019. Retrieved November 9, 2019.
  68. ↑ Schemm, Paul; Aratani, Lori; Laris, Michael (March 12, 2019). "Boeing Max 8 will continue to fly in U.S. and Europe even as China, Ethiopia ground it". The Washington Post. Archived from the original on September 15, 2019. Retrieved March 14, 2019.
  69. ↑ Summary of the FAA's review of the Boeing 737 MAX (PDF) (Report). FAA. November 18, 2020. Archived (PDF) from the original on January 23, 2021. Retrieved January 25, 2021.
  70. ↑ David Koenig (March 20, 2019). "European, Canadian regulators to do own review of Boeing jet". Associated Press – via Business Insider.
  71. ↑ "How much was pilot error a factor in the Boeing 737 MAX crashes?". The Seattle Times. May 15, 2019. Archived from the original on July 27, 2020. Retrieved July 14, 2020.
  72. ↑ "Blaming Dead Pilots Brought to You by Boeing". Corporate Crime Reporter. May 22, 2019.
  73. ↑ Gregory Polek (November 27, 2019). "FAA To Take Full Control of Max Airworthiness Certification". AIN online. Archived from the original on July 27, 2020. Retrieved April 3, 2020.
  74. ↑ "Boeing Statement on 737 MAX Simulator Training" (Press release). Boeing. January 7, 2020. Archived from the original on March 16, 2020. Retrieved March 28, 2020.
  75. ↑ Jon Hemmerdinger (May 27, 2020). "Boeing restarts 737 Max production". Flightglobal. Archived from the original on June 6, 2020. Retrieved July 4, 2020.
  76. ↑ Wolfsteller, Pilar (July 1, 2020). "FAA completes three days of 737 Max flight testing". Flight Global. Archived from the original on July 3, 2020. Retrieved July 3, 2020.
  77. ↑ "After 18-Month Investigation, Chairs DeFazio and Larsen Release Final Committee Report on Boeing 737 MAX" (Press release). House Committee on Transportation and Infrastructure. September 16, 2020. Archived from the original on September 20, 2020. Retrieved September 20, 2020.
  78. ↑ Hemmerdinger, Jon (September 30, 2020). "FAA's Dickson flies Max, declares 'I like what I saw'". Flight Global. Archived from the original on October 3, 2020. Retrieved October 1, 2020.
  79. ↑ "Report: Europe closing in on decision to let 737 Max fly". AP News. October 16, 2020.
  80. ↑ "Continued Airworthiness Notification to the International Community" (PDF). Federal Aviation Administration. November 18, 2020. Archived (PDF) from the original on November 24, 2020. Retrieved January 14, 2021.
  81. ↑ Chokshi, Niraj (November 18, 2020). "Boeing's 737 Max Will Be Flying Again. What Do Travelers Need to Know?". The New York Times. Archived from the original on November 19, 2020. Retrieved November 18, 2020.
  82. ↑ "Boeing 737 Max: Brazilian airline resumes passenger flights". BBC News. December 9, 2020. Archived from the original on December 9, 2020. Retrieved December 9, 2020.
  83. ↑ "Boeing Max Returns to US Skies With First Passenger Flight". U.S. News. December 29, 2020.
  84. 1 2 "Boeing Charged with 737 Max Fraud Conspiracy and Agrees to Pay over $2.5 Billion" (Press release). The United States Department of Justice. January 7, 2021. Archived from the original on January 8, 2021. Retrieved January 8, 2021.
  85. 1 2 "Boeing to pay $2.5bn over 737 Max conspiracy". BBC. January 7, 2021. Archived from the original on January 8, 2021. Retrieved January 8, 2021.
  86. ↑ "Removal of Notice of Flight Prohibition Number 001/2021" (PDF) (Press release). Trinidad and Tobago Civil Aviation Authority. January 13, 2021.
  87. ↑ "Transport Canada introduces additional requirements to allow for the return to service of the Boeing 737 MAX" (Press release). Transport Canada. January 18, 2021. Archived from the original on January 28, 2021. Retrieved January 28, 2021.
  88. ↑ "Transport Canada Validates 737 MAX Design Changes, Expects Return to Service in January". Aviation Today. December 18, 2020. Archived from the original on January 28, 2021. Retrieved January 28, 2021.
  89. ↑ "Boeing 737 Max cleared to fly in Europe after crashes". BBC News. January 27, 2021. Archived from the original on January 28, 2021. Retrieved January 28, 2021.
  90. ↑ Kaminski-Morrow, David (January 27, 2021). "EASA yet to approve 737 Max for certain precision approaches". Flight Global. Archived from the original on January 30, 2021. Retrieved January 28, 2021.
  91. ↑ "Australia lifts ban on Boeing 737 MAX, a first in Asia-Pacific region". Reuters. February 26, 2021. Archived from the original on April 22, 2021. Retrieved February 26, 2021.
  92. ↑ "Boeing Tells Airlines to Stop Flying Some 737 Max Planes". The New York Times. April 9, 2021. Archived from the original on April 12, 2021. Retrieved April 12, 2021.
  93. ↑ "DGCA 26 August 2021". August 27, 2021. Archived from the original on August 27, 2021. Retrieved August 27, 2021.
  94. ↑ "Boeing 737 Max Aircraft: India allows Boeing 737 Max to fly again| India Business News". The Times of India. August 27, 2021. Archived from the original on August 27, 2021. Retrieved August 27, 2021.
  95. ↑ Gebre, Samuel (September 2, 2021). "Ethiopian Aims to Fly Max Jet by January After Boeing Deal". Bloomberg. Archived from the original on September 3, 2021. Retrieved September 3, 2021.
  96. ↑ Ngui, Yantoultra (September 2, 2021). "Malaysia Lifts Ban on Boeing 737 Max After Two-Year Grounding". Bloomberg. Archived from the original on September 3, 2021. Retrieved September 3, 2021.
  97. ↑ "Malaysia lifts ban on Boeing 737 MAX". Bangkok Post. Reuters. September 2, 2021. Retrieved September 3, 2021.
  98. ↑ Chokshi, Niraj (October 14, 2021). "Former Boeing Pilot Is Indicted in 737 Max Inquiry". The New York Times. ISSN 0362-4331. Archived from the original on November 1, 2021. Retrieved November 1, 2021.
  99. ↑ Wolfsteller, Pilar (December 2, 2021). "China approves changes to Boeing 737 Max and clears way for jet's return". Flightglobal. Archived from the original on December 3, 2021. Retrieved December 3, 2021.
  100. ↑ Christina, Bernadette (December 28, 2021). "Indonesia allows Boeing's 737 MAX to fly again after deadly crash". Reuters. Archived from the original on December 28, 2021. Retrieved December 28, 2021.
  101. ↑ Endeshaw, Dawit (February 2, 2022). "Ethiopian Airlines flies 737 MAX with passengers for first time since deadly crash". Reuters. Retrieved February 2, 2022.
  102. ↑ Chokshi, Niraj (March 23, 2022). "Jury Finds Former Boeing Pilot Not Guilty of Fraud in 737 Max Case". The New York Times. ISSN 0362-4331. Retrieved April 9, 2023.
  103. ↑ Meilhan, Pierre (January 13, 2023). "Boeing 737 Max 8 takes off in China for the first time since 2019". CNN. Retrieved January 6, 2024.
  104. ↑ "Boeing's long road to the 737 MAX's return in China". Reuters. January 13, 2023. Retrieved January 6, 2024.
  105. ↑ "US engineers recommended grounding Boeing 737 MAX soon after second crash, report says". Reuters. January 7, 2024. Retrieved January 7, 2024.
  106. ↑ "Missing piece on aircraft prompts Boeing to ask airlines to inspect all 737 Max jets". CNN. December 28, 2023. Retrieved January 6, 2024.
  107. ↑ Mackintosh, Thomas; Armstrong, Kathyrn (January 6, 2024). "Alaska Airlines grounds 737 Max 9 planes after window blows out mid-air". BBC News. Retrieved January 6, 2024.
  108. 1 2 "Information about Alaska Airlines Flight 1282". Alaska Airlines. January 8, 2024. Archived from the original on January 9, 2024. Retrieved January 9, 2024.
  109. ↑ "FAA Statement on Temporary Grounding of Certain Boeing 737 MAX 9 Aircraft". Federal Aviation Administation.{{cite news}}: CS1 maint: url-status (link)
  110. ↑ Walker, Mark; Chokshi, Niraj (January 7, 2024). "FAA Orders Some Boeing Max 737 Planes Grounded Pending Inspection". The New York Times. Retrieved January 7, 2024.
  111. ↑ Machi, Sara (January 6, 2024). "Some 737 Max9 aircrafts returning to service after part blew off Alaska Airlines plane". CBS Chicago. Retrieved January 7, 2024.
  112. ↑ Root, Al. "Europe's Decision to Ground Boeing 737 MAX 9 Jets Tells Investors Something". Barrons. Retrieved January 7, 2024.
  113. ↑ "Updates on Grounding of Boeing 737 MAX 9 Aircraft". Federal Aviation Administration. January 6, 2024. Archived from the original on January 8, 2024. Retrieved January 8, 2024.
  114. ↑ Ostrower, Jon (January 8, 2024). "United finds loose bolts on plug doors during 737 Max 9 inspections". The Air Current. Retrieved January 8, 2024.
  115. ↑ "United Airlines found loose bolts, other issues on a key part of grounded Boeing 737 Max 9 jetliners". AP News. January 8, 2024. Retrieved January 8, 2024.
  116. ↑ Sweeney, Sam; Hutchinson, Bill. "United finds loose bolts on 737 Max 9 planes in wake of Alaska Airlines door plug incident". ABC News. Retrieved January 9, 2024.
  117. ↑ Josephs, Leslie (January 11, 2024). "FAA investigating if Boeing failed to ensure aircraft were safe for operation". CNBC. Retrieved January 11, 2024.
  118. ↑ Federal Aviation Administration, The (January 12, 2024). "FAA Increasing Oversight of Boeing Production and Manufacturing". Retrieved January 12, 2024.{{cite web}}: CS1 maint: url-status (link)
  119. ↑ "Boeing's 737 MAX Crisis: Coverage by The Seattle Times". The Seattle Times. December 15, 2019. Retrieved March 5, 2020.
  120. ↑ Gates, Dominic; Miletich, Steve; Kamb, Lewis (October 2, 2019). "Boeing pushed FAA to relax 737 MAX certification requirements for crew alerts". The Seattle Times. Retrieved October 4, 2019.
  121. ↑ Slotnick, David. "The DOJ is reportedly probing whether Boeing's chief pilot misled regulators over the 737 Max". Business Insider. Retrieved February 22, 2020.
  122. ↑ "Inspector General report details how Boeing played down MCAS in original 737 MAX certification – and FAA missed it". The Seattle Times. June 30, 2020. Retrieved July 2, 2020.
  123. ↑ "FAA Probing Boeing's Alleged Pressure on Designated Inspectors". BNN Bloomberg. July 9, 2020. Retrieved July 30, 2020.
  124. ↑ "Final Committee Report on the Design, Development, and Certification of the Boeing 737 MAX". The House Committee on Transportation and Infrastructure. September 15, 2020. p. 141.
  125. ↑ Gates, Dominic (November 18, 2020). "Boeing 737 MAX can return to the skies, FAA says".
  126. ↑ "Transport Canada introduces additional requirements to allow for the return to service of the Boeing 737 MAX" (Press release). Transport Canada. January 18, 2021.
  127. ↑ "Boeing 737 Max cleared to fly in Europe after crashes". BBC News. January 27, 2021.
  128. ↑ Laris, Michael (June 19, 2019). "Changes to flawed Boeing 737 Max were kept from pilots, DeFazio says". The Washington Post. Archived from the original on December 5, 2020. Retrieved February 29, 2020.
  129. ↑ "The decision by both the FAA and Boeing to omit information about MCAS from communications with the public, 737 MAX customers, and MAX pilots did not last long. – House report"
  130. ↑ Andy Pasztor; Andrew Tangel; Alison Sider (May 6, 2019). "Boeing Knew of Problem for a Year". The Wall Street Journal. p. A1.
  131. ↑ "Boeing nearing 737 Max fleet bulletin on AoA warning after Lion Air crash". The Air Current. November 7, 2018. Archived from the original on October 13, 2019. Retrieved July 10, 2019.
  132. ↑ "FAA issues emergency AD regarding potential erroneous AOA input on Boeing 737 MAX". ASN News. November 7, 2018. Archived from the original on June 7, 2019. Retrieved June 7, 2019.
  133. ↑ Tangel, Andrew; Pasztor, Andy (July 31, 2019). "Regulators Found High Risk of Emergency After First Boeing MAX Crash". The Wall Street Journal. Archived from the original on July 31, 2019. Retrieved July 31, 2019..
  134. ↑ Hradecky, Simon (January 14, 2019). "Crash: Lion B38M near Jakarta on Oct 29th 2018, aircraft lost height and crashed into Java Sea, wrong AoA data". The Aviation Herald. Archived from the original on March 9, 2021. Retrieved March 2, 2020.
  135. ↑ "Multi Operator Message" (PDF). Skybrary. Archived (PDF) from the original on June 28, 2021. Retrieved January 26, 2021.
  136. ↑ "Boeing: US regulator admits 'mistake' over aircraft crashes". BBC. December 11, 2019. Archived from the original on December 12, 2019. Retrieved July 21, 2021.
  137. ↑ "Continued Airworthiness Notification to the International Community" (PDF). FAA. March 11, 2019. Archived (PDF) from the original on November 3, 2019. Retrieved March 19, 2019.
  138. ↑ "Exclusive: Boeing kept FAA in the dark on key 737 MAX design changes - U.S. IG report". Reuters. July 1, 2020. Archived from the original on May 6, 2021. Retrieved July 21, 2021.
  139. ↑ "Airworthiness Directives; The Boeing Company Airplanes". rgl.faa.gov. November 20, 2020. Archived from the original on April 18, 2022. Retrieved December 12, 2020.
  140. ↑ Public Domain This article incorporates public domain material from Boeing 737 MAX Reading Room. Federal Aviation Administration.
  141. ↑ Lahiri, Tripti (March 11, 2019). "China is the first country to ground the Boeing 737 Max after its two crashes". Quartz. Retrieved August 8, 2020.
  142. ↑ Josephs, Leslie (October 29, 2019). "In brutal Senate hearing, Boeing admits its safety assessments of 737 Max fell short". CNBC.
  143. ↑ "How Boeing went from appealing for government aid to snubbing it". Reuters. May 2, 2020. Archived from the original on February 22, 2021. Retrieved July 22, 2020.
  144. ↑ Transportation (November 13, 2019). "CAE builds extra Boeing 737 Max simulators, expecting pent-up demand | Financial Post". Financialpost. Retrieved November 14, 2019.
  145. ↑ Chris Isidore (November 17, 2020). "Boeing's 737 Max debacle could be the most expensive corporate blunder ever". CNN. Archived from the original on December 21, 2020. Retrieved November 21, 2020.
  146. ↑ Boeing's Fatal Flaw (full documentary) | FRONTLINE, retrieved July 1, 2022
  147. ↑ Kenigsberg, Ben (February 17, 2022). "'Downfall: The Case Against Boeing' Review: Behind Two Fatal Crashes". The New York Times. Retrieved February 19, 2022.
  148. ↑ "Review: Netflix doc 'Downfall: The Case Against Boeing' explores cost of greed over safety". Los Angeles Times. February 18, 2022. Retrieved February 19, 2022.
  149. ↑ "Boeing refuses to play ball as Dutch MPs reopen 2009 crash involving 737". euronews. February 7, 2020. Archived from the original on February 9, 2020. Retrieved February 8, 2020.

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