Event Details

Title:Airframe vibration during climb, Boeing 747-367, AP-BFY
Micro summary:This Boeing 747-367 experienced airframe vibration during climb.
Event Time:2000-09-05 at 0420 UTC
File Name:2000-09-05-UK.pdf
Publishing Agency:Aircraft Accident Investigation Board (AAIB)
Publishing Country:United Kingdom
Report number:EW/C2000/9/1
Site of event:Cruise, over Arabian Sea
Departure:Quaid-e-Azam/Jinnah International Airport, Karachi, Pakistan
Destination:Birmingham International Airport, West Midlands, England
Airplane Type(s):Boeing 747-367
Flight Phase:Climb
Operator(s):PIA - Pakistan International Airlines
Type of flight:Revenue
Serious Injuries:0
Other Injuries:0
Executive Summary:The aircraft was operating a scheduled passenger from Karachi to Manchester. The Technical Log showed that the aircraft was serviceable for the flight, and that a number of minor defects had been rectified between flights, including replacement of the No 2 igniter plug on the No 3 engine. The Flight Engineer completed the pre-flight walkaround check and noticed nothing untoward.

The departure from Karachi was uneventful, but passing about 20,000 feet in the climb the crew suddenly became aware of a medium frequency airframe vibration. All cockpit indications were normal and the crew therefore began a troubleshooting process to identify the vibration source. Before the process could be completed the vibration disappeared and did not recur for the rest of the flight. On arrival at Manchester all systems operated normally and the aircraft landed and taxied to its parking stand.
Learning Keywords:Operations - Maintenance
Systems - Engine - Contained Engine Failure
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