Maintenance Errors in Aviation Accidents
7,830 occurrences · 549 fatal · 2,727 fatalities · 1953–2026
What it is
Maintenance-error accidents trace back to work performed on the aircraft before the flight — a part installed incorrectly, an inspection step skipped or misread, or a repair that did not restore the aircraft to its airworthy condition. The failure surfaces in flight, but its origin is on the ground, in the maintenance and inspection process rather than in how the aircraft was flown.
Why it happens
Typical patterns include reassembly errors after a component is removed and reinstalled, using an incorrect part or torque value, missing a required inspection or airworthiness directive, or a sign-off that certified work as complete when a step had actually been missed. These errors are often traced to gaps in documentation, time pressure, or a breakdown in the handoff between the person doing the work and the person inspecting or approving it.
How the industry defends against it
Commercial maintenance operates under a layered system of certified technicians, independent inspection of critical work (required dual inspection for certain tasks), mandatory airworthiness directives from regulators, and detailed maintenance manuals and documentation trails that must be signed off at each step. Reliability-monitoring programs also track fleet-wide component performance to catch a defect pattern before it causes another failure.
What this means for passengers
Airline maintenance is performed by certified technicians under a regulated, independently inspected system with mandatory documentation and airworthiness-directive compliance, which is a materially different environment from general-aviation maintenance, which lacks that layered oversight. Many of the accidents in this database involve smaller aircraft maintained outside that commercial system.
Aircraft families
- Boeing 73759
- Boeing 72731
- Boeing 74728
- McDonnell Douglas DC-922
- ATR 42/7214
- Boeing 75713
- Boeing 70713
- Airbus A3208
- Boeing 7675
- Boeing 7874
Countries
- United States6,204
- South Africa204
- Poland193
- Brazil160
- Switzerland102
- United Kingdom68
- France55
- Canada41
- Puerto Rico27
- Sweden24
Notable investigated accidents
- 1979-05-25 — American Airlines,inc. (271 fatalities)
- 1991-07-11 — Nigeria Airways (261 fatalities)
- 1994-06-06 — China Northwest Airlines (160 fatalities)
- 1975-04-04 — United States Air Force - USAF (since 1947) (155 fatalities)
- 2005-09-05 — Mandala Airlines (149 fatalities)
- 1992-07-31 — China General Aviation Corporation - CGAC (107 fatalities)
- 1996-10-02 — AeroPeru (70 fatalities)
- 1999-02-24 — China Southwest Airlines (61 fatalities)
- 1966-01-14 — Avianca (56 fatalities)
- 1995-12-05 — Azerbaijan Airlines - AZAL Airlines (52 fatalities)
- 2016-12-07 — Pakistan International Airlines (47 fatalities)
- 1993-04-27 — Zambia Air Force (30 fatalities)
Counts are derived from official investigation records; one accident may involve several causes, and older or foreign records can be incomplete. This page explains patterns — it is not a safety ranking.