22 августа  Cessna-421 RA-0879G

     The Interstate Aviation Committee Investigation team has completed the investigation of the accident with С-421 RA-0879G single-built aircraft owned by "Inter Trans Avia" Airlines" CJSC occurred in the Leningrad region (RF) on August 22, 2012.
      Most probably the accident with С-421 RA-0879G single-built aircraft was caused by right and then left engine flameout during touch-and-go landing, flight speed decrease and aircraft stall entry resulted in aircaft ground impact with bank angle over 70°.
      Most probably engines flameout midair was caused by fuel-air mixture depletion due to low level of fuel in aircraft tanks that in combination with its inadequate quality resulted in engines trouble.
      Combination of the following factors could contribute to the accident:
      • Flight operation with low level of fuel on board.
      • Inadequate fuel quality.
      • Inadequate crew training for forthcoming fligth.
      • Inadeauate maintenance prior to aircraft familiarization flight after its long-term parking.
      • Touch-and-go landing and continued takeoff with engines trouble during run operation. .
      • Non-feathering of switched-off engine propeller midair (non compliance with requirement of clause "2" of subsection 3 of «ENGINE INOPERATIVE PROCEDURE» section aircraft FOM).
      • Possible on position failure of fuel booster pump switches by crew before aircraft take-off.
      • Inadequate flight operation management, aircaft maintenance and efficiency dicipline in "Aviator" Airclub" LLC, weak monitoring from senior staff over maintenance operation on accident prevention. 
      The flight was performed by crew on aircaft without airworthiness certificate (violation of clause 1 article 35 of Air Code of RF and clause 1 of FAR-118).
      Appropriate safety recommendations based on the investigation results were developed.