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Accident description
Last updated: 14 December 2017
Status:
Date:Saturday 16 December 1978
Type:Silhouette image of generic F27 model; specific model in this crash may look slightly different
Fokker F-27 Friendship 200
Operator:Pakistan International Airlines - PIA
Registration: AP-ATO
C/n / 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
Airplane damage: Damaged beyond repair
Location:Karachi (   Pakistan)
Phase: Approach (APR)
Nature:Test
Departure airport:Karachi International Airport (KHI/OPKC), Pakistan
Destination airport:Karachi International Airport (KHI/OPKC), Pakistan
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:

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 Wendt


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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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