波音737MAX空难调查报告（最终版）_244页_2mb

Boeing 737 MAX Design, Development & Certification Committee Report Summary

Core Content

This report, prepared by the U.S. House Committee on Transportation and Infrastructure, details the findings of an 18-month investigation into the design, development, and certification of the Boeing 737 MAX aircraft, which was involved in two fatal crashes in 2018 and 2019. The report highlights systemic failures in both Boeing's engineering and management practices and the FAA's regulatory oversight, contributing to the tragic outcomes.

Main Findings

The MAX Crashes

• Lion Air Flight 610 (October 29, 2018): Crashed into the Java Sea, killing all 189 passengers and crew, plus one rescue diver.
• Ethiopian Airlines Flight 302 (March 10, 2019): Crashed six minutes after takeoff, killing all 157 passengers and crew, including eight U.S. citizens.

Both crashes involved the Maneuvering Characteristics Augmentation System (MCAS), a critical system that caused the plane's nose to pitch down without pilot input, leading to loss of control.

Investigative Themes

• Technical design flaws in the MCAS system.
• Faulty assumptions about pilot response times.
• Management misjudgments by Boeing.
• Oversight lapses by the FAA.

Investigative Findings

• The MCAS was designed to be activated based on angle-of-attack (AOA) sensor data.
• A refurbished AOA sensor on Lion Air Flight 610 was faulty and led to an erroneous MCAS activation.
• The MCAS did not meet its own design requirements and was vulnerable to single AOA sensor failure.
• Boeing's engineers did not fully understand the MCAS system and its implications.
• Pilots were not adequately informed about the MCAS system, which contributed to their inability to respond effectively during the crashes.
• The FAA's oversight was compromised by regulatory capture, leading to insufficient compliance and enforcement.

Boeing History and 737 MAX Background

• The 737 MAX is the fourth generation of the 737 model and the 13th 737 model produced by Boeing.
• It was developed as a derivative of the 737 Next Generation (NG) aircraft, with the goal of improving fuel efficiency.
• The 737 MAX was the most profitable aircraft in Boeing's history, with a $22 billion order from Lion Air in 2011.
• The MCAS system was introduced to address aerodynamic instability caused by the larger engines used on the MAX.

FAA Oversight and Delegation of Authority

• The FAA delegated certification authority to Boeing through the Organization Designation Authorization (ODA) program, which has been criticized for lack of transparency and insufficient oversight.
• The FAA's bias in favor of Boeing is a recurring theme in the report, suggesting a conflict of interest.
• The FAA failed to identify the flaws in the MCAS system and did not enforce safety standards effectively.

Maneuvering Characteristics Augmentation System (MCAS)

• The MCAS was designed to prevent the aircraft from stalling by pushing the nose down.
• It was activated based on a single AOA sensor, which is a critical flaw in the system.
• Boeing rejected the idea of an MCAS indicator light, making it difficult for pilots to detect system activation.
• The MCAS was not properly tested or communicated to pilots, leading to poor training and lack of awareness.

Angle of Attack (AOA) Disagree Alert

• The AOA Disagree Alert was supposed to notify pilots if there was a discrepancy between the two AOA sensors.
• This alert became non-functional on the 737 MAX, leading to missed opportunities to detect and correct the issue.
• The AOA sensor failure was not properly addressed by Boeing or the FAA, contributing to the crashes.

Boeing 737 MAX Pilot Training

• The training program for the 737 MAX was Level B, which is less comprehensive than Level A.
• This decision was driven by cost and time pressures, leading to inadequate preparation for the MCAS system.
• Pilot training did not include detailed information on the MCAS, which contributed to their inability to respond effectively during the crashes.

Production Pressure

• The 737 MAX production line was under intense pressure to meet delivery deadlines.
• This led to compromises in safety and quality control.
• Production pressure was a key factor in the failure to address known issues with the MCAS and AOA sensors.

Post-Accident Response

• The FAA issued an emergency airworthiness directive to ground the 737 MAX following the crashes.
• Boeing's response was criticized for being insufficient and lacking transparency.
• The committee found that the crashes were preventable and that both Boeing and the FAA failed in their responsibilities.

Final Observations

• The 737 MAX was not designed with the safety of the public in mind.
• Boeing's management failed to address safety concerns and prioritize transparency.
• The FAA's oversight was inadequate and compromised by regulatory capture.
• The report calls for a culture change in both Boeing and the FAA to ensure better safety practices and regulatory oversight.

Key Individuals and Organizations

• Keith Leverkuhn: Former VP and GM of the 737 MAX Program.
• Michael Teal: Former VP and Chief Project Engineer of the 737 MAX Program.
• Mark Forkner: Former Chief Technical Pilot of the 737 MAX Program.
• Elizabeth Pasztor: VP of BCA Safety, Security and Compliance.
• FAA: Federal Aviation Administration.
• NTSB: National Transportation Safety Board.
• Xtra Aerospace: Company that refurbished the faulty AOA sensor.

Conclusion

The Boeing 737 MAX crashes were the result of a series of technical and managerial failures, including faulty design assumptions, lack of transparency, and inadequate oversight by the FAA. The report emphasizes the need for improving safety cultures and regulatory reforms to prevent future tragedies.