Incident Overview
Date: Saturday 16 December 1978
Aircraft Type: Fokker F-27 Friendship 200
Owner/operator: Pakistan International Airlines – PIA
Registration Number: AP-ATO
Location: Karachi –
ÿ Pakistan
Phase of Flight: Approach
Status: Destroyed, written off
Casualties: Fatalities: 1 / Occupants: 2
Component Affected: Contact switches of No.1 engine propeller automatic flight safety pitch lock withdrawal system.Contact switches of No.1 engine propeller automatic flight safety pitch lock withdrawal system.
Category: Accident
An F-27 aircraft experienced an immediate loss of power during a stall recovery test following a power increase. The probable cause was a simultaneous failure of both engines due to overtemperature, resulting from malfunction of contact switches related to pitch lock withdrawal and pilot error in manually withdrawing these locks.An F-27 aircraft experienced an immediate loss of power during a stall recovery test following a power increase. The probable cause was a simultaneous failure of both engines due to overtemperature, resulting from malfunction of contact switches related to pitch lock withdrawal and pilot error in manually withdrawing these locks.
Description
Both engines lost power immediately following power increase during a stall recovery. The F-27 was engaged in a series of stall tests. PROBABLEÿCAUSE: “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.”
Primary Cause
Malfunction of contact switches related to pitch lock withdrawal and pilot error in manual lock withdrawal.Malfunction of contact switches related to pitch lock withdrawal and pilot error in manual lock withdrawal.Share on:
