Russian investigators have concluded that the Moskovia Airlines Antonov An-12 which crashed near Chelyabinsk earlier this year had suffered loss of roll stability following fire damage to aileron controls.
All nine occupants of the aircraft, bound for Perm, were killed as it struck the ground while attempting to return to Chelyabink Airport shortly after departure on 26 May.
While ignition of electrical wiring in the freight hold is suspected to have caused the fire, the Interstate Aviation Committee (MAK) admits that it is unable to pinpoint the precise source or location.
The fire is thought to have caused heat damage to mechanical controls in the region of frames 23-25 in the freight cabin, and MAK believes these subsequently broke under tensile loading.
Electrical power distribution systems and other equipment were badly damaged by fire following the crash and MAK says it has "not been possible" to locate a primary cause of ignition, or the precise point at which the fire started.
Source: Air Transport Intelligence news
Fonte: Flight Safety Information 03/10/2008.
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