Event Details

Title:Ambiguous gear indications, Boeing 757-236, G-BIKW
Micro summary:On approach, this Boeing 757-236 experienced hydraulic problems, causing ambiguous gear indications.
Event Time:2001-03-14 at 1750 UTC
File Name:2001-03-14-UK.pdf
Publishing Agency:Aircraft Accident Investigation Board (AAIB)
Publishing Country:United Kingdom
Report number:EW/G2001/03/09
Site of event:Edinburgh Airport
Departure:London Heathrow Airport, London, England, United Kingdom
Destination:Edinburgh Airport, Edinburgh, Scotland
Airplane Type(s):Boeing 757-236
Flight Phase:Approach
Operator(s):British Airways
Type of flight:Revenue
Serious Injuries:0
Other Injuries:0
Executive Summary:The aircraft was on a scheduled passenger flight from London (Heathrow) Airport to Edinburgh. On the approach to Edinburgh all indications were normal. When the landing gear was selected down, the three green landing gear 'down and locked' lights illuminated. During the approach, a go- around was initiated from 500 feet agl due to an aircraft back-tracking the runway for take off. The flaps were selected from 30 to 20 and the landing gear was selected up, at which point the left hydraulic system fluid quantity indication rapidly fell to zero. This was shortly followed by a left hydraulic system low pressure warning and flap and landing gear position disagree warnings. When the landing gear lever was reselected down, the green lights for the Nose Landing Gear (NLG) and left Main Landing Gear (MLG) illuminated, but the light for the right MLG remained off. The landing gear selector lever was cycled several times but the right MLG green light remained extinguished.

The flight crew performed the Quick Reference Handbook (QRH) procedures for left hydraulic system failure and alternate landing gear lowering but the right MLG green light remained off. The flap and landing gear position disagree warnings (which indicate a disagreement between the selected and actual positions) subsequently extinguished. The flight crew replaced one of the two filaments in the right MLG green light with a spare filament, but the light still remained off. After obtaining ATC approval, the runway was overflown at 3,000 feet and ATC reported that the right MLG appeared to be fully down. A flaps 20 approach was flown and the aircraft landed without further incident. As the nose wheel steering was inoperative due to the loss of the left hydraulic system, the flight crew stopped the aircraft on the runway and shut down the engines. The aircraft was towed from the runway after the passengers had been disembarked. The engineer attending the aircraft on the runway was able to insert the landing gear locking pins with no difficulty, confirming that the landing gears were locked down.
Learning Keywords:Operations - Upset - Uncommanded or excessive Yaw
Systems - Hydraulics
Close match:Loss of directional control, Trans World Airlines, Inc., Boeing 707-331C, N787TW, National Aviation Facilities Experimental Center, Atlantic City Airport, Pomona, New Jersey, July 26, 1969
Rudder control malfunction, Boeing 757-200ER, September 13, 1993
Runway excursion, hydraulic failure, Boeing 737-200RS, Salt Lake City, September 24, 1997
Runway excursion, Boeing 737-223, Atlanta, November 1, 1998


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