Service difficulty report · O-Ring Seal · Boeing 737291

Difficulty date
June 18, 1996
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N978UA
Make and model
Boeing 737291
Aircraft serial
21509
Engine
Pwa JT8D9A
Part
O-Ring Seal
Part number
AS3209135
Condition
Deteriorated
Location
Nr 1 Engine
Part time
4,087 hours
Stage of operation
CL
Nature of condition
K, J
Precautionary procedure
A, E

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

ON TAKEOFF, NR ONE ENGINE OIL PRESSURE WENT TO 85 POUNDS PER SQUARE INCH. IN CLIMB, OIL TEMPERATURE INCREASED. REDUCED POWER AND OIL QUANTITY WENT TO ZERO . LOW OIL PRESSURE LIGHT FLASHED. RETURNED TO FIELD. SMOKE FROM ENGINE REPORTED BY TOWER. SHUT DOWN ENGINE ON TAXI IN. OIL APPEARED TO HAVE OVERTEMPTED. 4 1/2-6 TRUMPET SEALS WERE HARD, DETERIORATED AND LEAKING. MAIN OIL PUMP HOUSING DISTORTED AND SEVERELY WORN DUE TO EXCESSIVE HEAT. INDICATIONS OF LOW GRADE OIL FIRE. SUSPECT FIRE HEATED OIL DISTORTED PUMP AND CAUSED OIL DRAIN-BACK. OIL LOSS DUE TO LACK OF SCAVENGE AND OIL GOING OUT BREATHER. ISOLATED CASE. REPAIRED OR REPLACED PARTS AS NECESSARY. PART TOTAL CYCLES, 3,080.