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Last updated: 22 September 2019
Statuts:Enquête Officielle
Date:vendredi 3 mai 2013
Heure:14:55
Type/Sous-type:Silhouette image of generic K35R model; specific model in this crash may look slightly different
Boeing KC-135R Stratotanker
Compagnie:United States Air Force - USAF
Immatriculation: 63-8877
Numéro de série: 18725/708
Année de Fabrication: 1964-07-23 (48 years 10 months)
Moteurs: 4 CFMI F108-CF-100
Equipage:victimes: 3 / à bord: 3
Passagers:victimes: 0 / à bord: 0
Total:victimes: 3 / à bord: 3
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:S of Chaldovar (   Kyrgyzstan)
Phase de vol: En vol (ENR)
Nature:Militaire
Aéroport de départ:Bishkek-Manas International Airport (FRU/UCFM), Kyrgyzstan
Aéroport de destination:Bishkek-Manas International Airport (FRU/UCFM), Kyrgyzstan
Détails:
A US Air Force Boeing KC-135R Stratotanker aircraft left Bishkek-Manas Airport at 14:30 LT for a combat aerial refueling mission.
Upon takeoff, a flight control system malfunction, the board found, generated directional instability, causing the aircraft's nose to slowly drift from side-to-side or "rudder-hunt." This condition, not fully diagnosed by the crew, progressed into a more dangerous oscillatory instability known as a "Dutch roll." The board identified that a poor layout of key information in the inflight manual and insufficient crew training contributed to the mishap by detracting from the crew's ability to act on critical information during their troubleshooting to turn off either of two cockpit switches which may have eliminated the malfunction.
Having not recognized the Dutch roll condition, the crew initiated a left turn to remain on-course along the planned route of flight and used a small amount of left rudder to coordinate the turn. The use of rudder, while in a Dutch roll, increased the aircraft's oscillatory instability. The ensuing large side-to-side movements of the aircraft varied the crew member's foot pressure on the rudder pedal which caused inadvertent fluctuations in rudder position. These fluctuating rudder movements, coupled with slight right rudder use while rolling out of the turn, compounded the Dutch roll severity and produced extreme airframe stress that caused the KC-135's tail section to separate from the aircraft. The subsequent, uncontrollable descent resulted in an in-flight explosion.

Sources:
» Air Mobility Command Public Affairs
» Kloop.kg 3-5-2013
» CNN 3-5-2013


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Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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