Boeing 767
The Boeing 767 is a wide-body twin-engine jetliner that pioneered Extended-range Twin-engine Operational Performance Standards (ETOPS) for transoceanic routes. It maintains a robust safety record characterized by high structural reliability and the successful transition from three-crew to two-crew flight decks.
Sources and editorial review
Awaiting editorial verification · Legacy analysis. Archive counts describe this collection; they are not aircraft safety rates.
Fleet totals are withheld until their sources have been reviewed.
In BlackBoxWiki Archive
Figures count recorded events, including incidents. Multi-aircraft events can appear under more than one aircraft family; casualty totals describe the whole event.
Design and ETOPS Pioneering
Developed in tandem with the 757, the 767 introduced a common pilot type rating and a digital glass cockpit. Its aerodynamic efficiency and engine reliability enabled the FAA to grant the first 120-minute ETOPS approval in 1985, fundamentally changing long-haul economics by allowing twin-jets to service routes previously restricted to three- or four-engine aircraft.
Uncommanded Thrust Reverser Deployment
A critical safety milestone for the type occurred following the Lauda Air Flight 004 accident. Investigation revealed that a failure in the thrust reverser isolation valve could lead to uncommanded deployment in flight. This resulted in a global fleet-wide redesign of the locking mechanisms to include redundant mechanical locks, preventing deployment unless the landing gear is compressed.
Fuel System and Power Management
The 767's fuel management system was scrutinized following the 'Gimli Glider' incident, which was attributed to human error in unit conversion rather than mechanical failure. However, the type has demonstrated high airframe resilience during total power loss scenarios, owing to its Ram Air Turbine (RAT) design which provides essential hydraulic pressure for flight controls.
Notable Accidents
- Lauda Air 004· 1991In-flight deployment of the left engine thrust reverser due to a valve malfunction, leading to structural failure.
- Ethiopian Airlines 961· 1996Ditching following fuel exhaustion during a hijacking; demonstrated airframe integrity during water impact.
- EgyptAir 990· 1999NTSB cited deliberate nose-down elevator input by the relief first officer; highlighted dual-input elevator architecture.
- Atlas Air 3591· 2019Loss of control following inadvertent activation of go-around mode and subsequent pilot spatial disorientation.
Recurring Causal Patterns
- Uncommanded thrust reverser deployment (pre-1991 fix)
- Pilot spatial disorientation during go-around maneuvers
- Maintenance-related flight control cable interference
- Controlled Flight Into Terrain (CFIT) in early non-GPS equipped variants
Regulatory & Industry Response
- AD 91-18-11: Mandatory installation of mechanical locking actuators for thrust reversers
- Enhanced training requirements for go-around mode awareness (following Atlas Air 3591)
- Mandatory inspection of elevator shear rivets to prevent control jams
- Updates to Flight Management Computer (FMC) software to prevent mode confusion
Top Causes in Archive
Case Files in Archive (13)
Verdict
The Boeing 767 is an aerodynamically stable and structurally sound platform that set the standard for modern twin-engine long-haul operations. While early service was marked by a significant thrust-reverser design flaw, the subsequent engineering fixes and the type's performance in emergency glide scenarios confirm a high level of inherent safety.