Investigation Summary
The investigation revealed a history of severe maintenance neglect. The aircraft, manufactured in 1973, had spent significant time operating in sub-Saharan Africa between 1994 and 1995, where the humid environment accelerated corrosion in hard-to-reach areas. Specifically, the area under the toilet drain and pantry was found to be 'exfoliating' due to water-induced corrosion. On the day of the accident, as the aircraft leveled off at its cruising altitude, the pressurized cabin put immense stress on the weakened structure. A longitudinal crack initiated under the toilet drain on the starboard side, propagating rapidly until the entire empennage separated from the main airframe. The flight engineer, who was reportedly in the tail section at the time as part of an assigned procedure, was immediately ejected from the aircraft.
Final Conclusions
The Interstate Aviation Committee (MAK) concluded the accident resulted from a structural failure of the fuselage caused by deep corrosion. Contributing factors included the failure of the airline's technical commission to properly assess the aircraft's condition before extending its service life, the lack of instrumental control methods during inspections, and the failure to account for the aircraft's prolonged operation in tropical climates. The regulatory documents of the time were also found to be insufficient for ensuring safety under modern operational conditions.
Photographic Evidence (1)
Video Analysis
No video analysis linked for this case file yet.
Airframe & Maintenance
Crew Experience
Captain
Viktor Vasilyevich Goncharov, age 41.
First Officer
Igor Evgenievich Osipov, age 34.
Navigator
Valery Anatolyevich Nikiforov, age 40.
Flight Engineer
Rustem Nurievich Asanov, age 38.
Systems & Failure Modes
Fuselage Structure
The rear fuselage skin and stringers failed due to extensive corrosion and fatigue cracks under pressurization loads.
Lavatory Drainage
Leaking fluids from the toilet system caused localized, severe corrosion in the lower fuselage that went undetected during maintenance.
Interesting Facts
- 01The aircraft's tail section was found 1.7 kilometres away from the main wreckage site.
- 02The aircraft had accumulated 41,181 flight hours and 27,628 cycles at the time of the crash.
- 03Investigators found no evidence of explosives or external impact, such as a missile strike.
- 04The aircraft was still wearing its original Aeroflot livery despite being operated by SAAK since 1993.
- 05Forensic evidence suggested most passengers remained conscious until the final ground impact.
Safety Actions & Advisories
Maintenance Protocol Revision
The investigation recommended the implementation of instrumental (non-destructive) testing methods for hard-to-reach areas of the An-24 fuselage during periodic maintenance.
Service Life Extension Reform
Authorities called for a revision of the 1994 regulations governing the extension of aircraft service lives, specifically requiring stricter accounting for operations in humid or tropical climates.
Known Controversies & Unanswered Questions
Acquittal of Maintenance Officials
Reference ↗In 2004, six SAAK officials charged with negligence were acquitted by a jury due to a 'lack of relevant actual information,' a verdict later upheld by the Russian Supreme Court despite the findings of the technical investigation.