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- The Boeing 737 MAX, grounded worldwide in March 2019 following two fatal crashes, has undergone extensive software updates, pilot training revisions, and regulatory scrutiny before being recertified for...
- The Boeing 737 MAX grounding began on March 13, 2019, after the crash of Ethiopian Airlines Flight 302, which followed the crash of Lion Air Flight 610 in...
- Investigations revealed that MCAS relied on a single angle of attack (AOA) sensor, and in both crashes, the sensor provided faulty readings.
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The Boeing 737 MAX, grounded worldwide in March 2019 following two fatal crashes, has undergone extensive software updates, pilot training revisions, and regulatory scrutiny before being recertified for flight. As of January 9, 2026, the 737 MAX is operating commercially in most global markets, though ongoing oversight and occasional inspections continue.
The Boeing 737 MAX Grounding
Table of Contents
The Boeing 737 MAX grounding began on March 13, 2019, after the crash of Ethiopian Airlines Flight 302, which followed the crash of Lion Air Flight 610 in October 2018. Both crashes involved the Maneuvering Characteristics Augmentation System (MCAS),a software feature designed to automatically push the nose of the aircraft down if it detects a stall.
Detail
Investigations revealed that MCAS relied on a single angle of attack (AOA) sensor, and in both crashes, the sensor provided faulty readings. The system repeatedly activated, forcing the aircraft into a dive that pilots were unable to recover from. The initial response focused on a software update to address the MCAS flaws.
Example or Evidence
The final report of the Joint Investigators Team (JIT) examining the Ethiopian Airlines crash, released in July 2019, highlighted the critical role of the faulty AOA sensor and the inadequate pilot training on MCAS. Ethiopian Airlines Press Release on JIT Report
Recertification and Return to Service
The Federal Aviation Governance (FAA) formally lifted the grounding order on November 18, 2020, after Boeing completed software enhancements to MCAS, including relying on two AOA sensors and limiting the systemS authority.However, the FAA mandated extensive pilot training and maintenance revisions before airlines could resume 737 MAX flights.
Detail
The recertification process involved multiple layers of review, including design changes, simulator testing, and real-world flight testing. The FAA also conducted a complete safety assessment of Boeing’s safety management system. Other international aviation authorities, such as the European Union Aviation Safety Agency (EASA), followed a similar, though independent, review process.
Example or evidence
The FAA issued an Airworthiness Directive (AD) 2020-24-02 on November 18,2020,outlining the required software updates,pilot training,and maintenance procedures for the 737 MAX. FAA Airworthiness Directive 2020-24-02. EASA issued its own Airworthiness Directive on January 27, 2021. EASA Airworthiness directive
Ongoing Oversight and Recent Developments (as of January 9, 2026)
As of January 9, 2026, the Boeing 737 MAX continues to operate commercially worldwide, with over 500 million flight hours accumulated since the lifting of the grounding order. However, regulatory agencies maintain heightened oversight, including periodic inspections of Boeing’s manufacturing processes and quality control systems.
Detail
In December 2023, the FAA initiated a formal inquiry into boeing following a mid-air incident involving a 737 MAX 9 where a door plug blew out during flight. This investigation led to a temporary grounding of some 737 MAX 9 aircraft for inspection. The National Transportation Safety Board (NTSB) is conducting a parallel investigation into the incident. Boeing has announced changes to its production processes and quality control measures in response to the incident and the FAA’s scrutiny.
Example or Evidence
The FAA issued an Emergency Airworthiness Directive (EAD) 2024-01-08R on January 6, 2024, requiring inspections of 737 MAX 9 door plugs. FAA Emergency Airworthiness directive 2024-01-08R