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Last updated: 6 April 2020
Statuts:Enquête Officielle
Date:mercredi 6 mai 1981
Heure:10:50
Type/Sous-type:Silhouette image of generic C135 model; specific model in this crash may look slightly different
Boeing EC-135N
Compagnie:United States Air Force - USAF
Immatriculation: 61-0328
Numéro de série: 18235/C13
Année de Fabrication: 1961-11-14 (19 years 6 months)
Heures de vol:13471
Moteurs: 4 Pratt & Whitney TF33-PW-102
Equipage:victimes: 17 / à bord: 17
Passagers:victimes: 4 / à bord: 4
Total:victimes: 21 / à bord: 21
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:3 km (1.9 milles) NNE of Walkersville, MD (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Militaire
Aéroport de départ:Dayton-Wright Patterson AFB, OH (FFO/KFFO), Etats-Unis d'Amérique
Aéroport de destination:Dayton-Wright Patterson AFB, OH (FFO/KFFO), Etats-Unis d'Amérique
Numéro de vol:AGAR23
Détails:
Boeing EC-135N aircraft 61-0328, call sign AGAR 23, was scheduled for an Advanced Range Instrumented Aircraft (ARIA) training mission out of Wright-Patterson AFB. The mission was designed provide training for the navigator and primary mission electronic equipment (PMEE) operators. On board the aircraft were 17 crewmembers and four authorized passengers. AGAR 23 departed at 10:05 and climbed to FL290, which was reached at 10:30. The aircraft commander occupied the right pilot seat and a passenger, his wife, occupied the left pilot seat.
For undetermined reasons, the aircraft pitch trim moved to the full nose-down position. The autopilot could overcome the trim until near full nose-down. The aircraft then rapidly pitched over, most likely upon release of the autopilot, and induced sufficient negative g forces to cause the generators to trip off line and loss of all AC electrical power. The pitch trim could then not be moved electrically. This condition, while unusual, can be easily controlled if prompt corrective action is taken; however, if corrective action is delayed approximately 8 sec., the aircraft pitch angle will be greater than 30 deg. nose-down and the airspeed in excess of 350 KIAS. Under these conditions, the aircraft cannot be controlled until the pitch trim is moved toward neutral. While it is clear that recovery was delayed, the reason for the delay is unknown. The aircraft became uncontrollable and entered a steep descent. The aircraft emerged from the clouds at 2,000 ft. AGL. Airspeed was in excess of 400 KTAS and dive angle was 20 to 30 deg. Engine power was above 2.0 EPR. At approximately 1,500 ft. MSL an explosion occurred inside the pressurized compartment of the fuselage and weakened the aircraft structure to the extent that catastrophic failure of the aircraft followed immediately.
The cause of this explosion was undetermined; however, the aircraft was in an unrecoverable condition at the time of the explosion and a crash was already inevitable.

Sources:
» USAF Aircraft Accident Investigation (IAW AFR 110-14)


Photos

photo of Boeing-EC-135N-61-0328
accident date: 06-05-1981
type: Boeing EC-135N
registration: 61-0328
photo of Boeing-EC-135N-61-0328
break-up points of the EC-135
photo of Boeing-EC-135N-61-0328
accident date: 06-05-1981
type: Boeing EC-135N
registration: 61-0328
 

Plan

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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Boeing C-135

  • 820 built
  • 59ème loss
  • 46ème accident fatal
  • le accident 6ème le plus grave (à ce moment là)
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