Flugunfall 06 MAY 1981 einer Boeing EC-135N 61-0328 - Walkersville, MD
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Status:Accident investigation report completed and information captured
Datum:Mittwoch 6 Mai 1981
Zeit:10:50
Flugzeugtyp:Silhouette image of generic C135 model; specific model in this crash may look slightly different
Boeing EC-135N
Fluggesellschaft:United States Air Force - USAF
Kennzeichen: 61-0328
Werknummer: 18235/C13
Baujahr: 1961-11-14 (19 years 6 months)
Betriebsstunden:13471
Triebwerk: 4 Pratt & Whitney TF33-PW-102
Besatzung:Todesopfer: 17 / Insassen: 17
Fluggäste:Todesopfer: 4 / Insassen: 4
Gesamt:Todesopfer: 21 / Insassen: 21
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:3 km (1.9 Meilen) NNE of Walkersville, MD (   USA)
Flugphase: Während des Fluges (ENR)
Betriebsart:Militär
Flug von:Dayton-Wright Patterson AFB, OH (FFO/KFFO), USA
Flug nach:Dayton-Wright Patterson AFB, OH (FFO/KFFO), USA
Flugnummer:AGAR23
Unfallbericht:
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.

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


Fotos

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
 

Map

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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Boeing C-135

  • 820 built
  • 59th loss
  • 46th Fataler Unfall
  • 6th worst accident (Zu diesem Zeitpunkt)
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