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Lessons from the record · Safety Assurance · Change & Config · V&V

Boeing 737 MAX: what investigators found

Written by Godfrey Evans, Founder & CEO · Last reviewed

Official investigations into the 737 MAX cover design assumptions, change control and build inspection.

Boeing 737 MAX aircraft on an airport taxiway
Boeing 737 MAX; not an aircraft involved in the incidents. Resized from original. Photo: Timothy A. Gonsalves · CC BY-SA 4.0.
Programme
Boeing 737 MAX
Year
2018–2026
Sector
Aerospace & Defence
Outcome
Worldwide grounding (2019–20); NTSB investigation of Flight 1282 (2024).

What happened

2018–19: Two fatal accidents were followed by a worldwide grounding of the aircraft type.

January 2024: A door plug separated from a MAX 9 on Alaska Airlines Flight 1282. The NTSB found the retaining bolts had not been reinstalled.

August 2026: The FAA issued an amended type certificate for the MAX 7. The FAA states it required updates to the flight-control software, the flightcrew alerting system and a redesigned engine anti-ice system before approval.

  1. 2018–19

    Two fatal accidents were followed by a worldwide grounding of the aircraft type.

    • KNKT, final investigation report (2019)
    • Joint Authorities Technical Review (JATR), report (2019)
    • US House Committee, final report (2020)
  2. January 2024

    A door plug separated from a MAX 9 on Alaska Airlines Flight 1282. The NTSB found the retaining bolts had not been reinstalled.

  3. August 2026

    The FAA issued an amended type certificate for the MAX 7. The FAA states it required updates to the flight-control software, the flightcrew alerting system and a redesigned engine anti-ice system before approval.

What was found

Findings are attributed to the investigating bodies cited below. This page does not add causal claims beyond them.

Engineering lesson

Investigators identified failures in design assumptions, change control and build inspection. Assurance has to hold from requirement through to inspection.

The practice this points to

Trace each requirement to its design assumptions, build instructions and inspection evidence, and run change-impact analysis whenever any of them changes.

Where Kelvora fits

Kelvora is an AI-powered requirements & assurance platform that supports traceability and change-impact analysis for engineer review.

Sources

  1. KNKT, final investigation report (2019)
  2. Joint Authorities Technical Review (JATR), report (2019)
  3. US House Committee, final report (2020)
  4. NTSB · DCA24MA063
  5. FAA · Statement on certification of the 737 MAX-7

Last reviewed

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