Event Details

Title:Bang! on gear retraction, Boeing 737-236, G-BGDL
Micro summary:On gear retraction, this Boeing 737 crew heard a "Bang!"
Event Time:1999-07-08 at 0745 UTC
File Name:1999-07-08-UK.pdf
Publishing Agency:Aircraft Accident Investigation Board (AAIB)
Publishing Country:United Kingdom
Report number:EW/G99/07/20
Site of event:Climb
Departure:Gatwick Airport, London, England
Airplane Type(s):Boeing 737-236
Flight Phase:Takeoff
Operator(s):British Airways
Type of flight:Revenue
Serious Injuries:0
Other Injuries:0
Executive Summary:The aircraft had just taken off on a scheduled flight when, as the landing gear was retracting at a height of some 100 to 200 feet agl, a loud 'bang' was heard and the aircraft shuddered and oscillated in roll momentarily. As the climb was continued, both pilots checked the engine indications which showed both engines to be operating normally. Shortly afterwards, however, a pungent smell became apparent on the flight deck and within the passenger cabin, and a passenger reported to the crew that flames had been seen emanating from the left engine for a short time. A 'Pan' call was transmitted and the aircraft then returned to Gatwick Airport where it landed without further incident.

An inspection of the aircraft revealed evidence of a birdstrike on the No.1 engine intake. One fan blade had been damaged and the constant speed drive (CSD) oil cooler matrix had become blocked and damaged.

Bird remains extracted from the engine were sent to the Birdstrike Avoidance Team at the Central Science Laboratory. The remains were identified, by microscopic feather analysis, to have come from a pigeon.
Learning Keywords:Operations - Bang, pop, crack, sizzle!
Operations - Birdstrike
Systems - Engine - Contained Engine Failure
Systems - Engine - Foreign Object Damage


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