On February 19, 1990, a Lockheed L-1011-385-1 (registration N31013) operated by Twa was involved in an aviation accident near Los Angeles, CA. Investigators recorded the probable cause as: THE FAILURE OF THE WELD HOLDING THE SLIP JOINT TO THE PNEUMATIC DUAL COMPENSATOR FROM THE NO. 2 ENGINE. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 related events involving the same aircraft type or operator are linked below.
A weld separation in a pneumatic compensator on the No. 2 engine of a Lockheed L-1011-385-1 caused bleed air to trigger the fire warning system. This is the third known occurrence of such a failure.
Incident Description
During a flight of a Lockheed L-1011-385-1, a weld at a slip joint of the pneumatic dual compensator for the No. 2 engine separated in the mid-cargo compartment area. This separation allowed bleed air from the engine to escape, which activated the fire warning light circuitry in that area and alerted the cockpit crew.
Maintenance History
This event is the third known separation of this specific unit. These pneumatic compensator units are part of the C-phase inspection schedule for the aircraft.
Service Bulletins
Two service bulletins addressing this issue were issued in 1978 and subsequently revised in 1984, under number SB09336-041.
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