Narrative:
Both engines lost power immediately following power increase during a stall recovery. The F-27 was engaged in a series of stall tests.
PROBABLE CAUSE: "Overtemperature of both engines, resulting in their simultaneous failure. This was caused by malfunction of the contact switches of No.1 engine propeller automatic flight safety pitch lock withdrawal system and the pilot's failure to withdraw the locks manually by placing the HP fuel cock levers in the 'lockout' position."
accident date: 16-12-1978
type: Fokker F-27 Friendship 200
registration: AP-ATO
| Status: | |
| Date: | Saturday 16 December 1978 |
| Type: |  Fokker F-27 Friendship 200 |
| Operator: | Pakistan International Airlines - PIA |
| Registration: | AP-ATO |
| MSN: | 10250 |
| First flight: | 1964 |
| Total airframe hrs: | 30260 |
| Cycles: | 38666 |
| Crew: | Fatalities: 1 / Occupants: 2 |
| Passengers: | Fatalities: 0 / Occupants: 0 |
| Total: | Fatalities: 1 / Occupants: 2 |
| Aircraft damage: | Damaged beyond repair |
| Location: | Karachi ( Pakistan)
|
| Phase: | Approach (APR) |
| Nature: | Test |
| Departure airport: | Karachi International Airport (KHI/OPKC), Pakistan |
| Karachi International Airport (KHI/OPKC), Pakistan |
Both engines lost power immediately following power increase during a stall recovery. The F-27 was engaged in a series of stall tests.
Probable Cause:
PROBABLE CAUSE: "Overtemperature of both engines, resulting in their simultaneous failure. This was caused by malfunction of the contact switches of No.1 engine propeller automatic flight safety pitch lock withdrawal system and the pilot's failure to withdraw the locks manually by placing the HP fuel cock levers in the 'lockout' position."
Sources:
» Willem WendtPhotos
accident date: 16-12-1978
type: Fokker F-27 Friendship 200
registration: AP-ATO
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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