Service difficulty report · Heat Exchanger · Boeing 767322

Difficulty date
October 26, 2025
Submitted
October 27, 2025
Operation
Air carrier
Aircraft
N651UA
Make and model
Boeing 767322
Aircraft serial
25389
Aircraft time
131,965 hours, 20,201 cycles
Engine
Pwa PW4060
Engine time
2,367 hours, 289 cycles
Part
Heat Exchanger
Part number
51G859U1600U
Part serial
F56644
Condition
Leaking
Location
Nr 2 Engine
Part time
84,895 hours, 13,870 cycles
Stage of operation
CR
How discovered
O
Nature of condition
K, J
Precautionary procedure
E, A

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

What was found

RIGHT ENG LOST QTY AND PRESS. BOTH WENT TO ZERO. EICAS ENG OIL PRESS R CREW REPORTED QUICK DROP OF OIL QUANTITY ALONG WITH DECREASING OIL PRESSURE AND ENG WAS SHUTDOWN. ENG WINDMILL TIME APPROXIMATELY 25 MINUTES WITH ZERO PSI & ZERO QTY OBSERVED. INSPECT PER AMM 72-00-00-206-019-N01. RT ENG OIL SERVICING TO FULL DONE, 32 QTS ADDED THIS IS FOR RT ENG, ENG 2 FOUND LEAK ON AIR OIL HEAT EXCHANGER , REPLACED PER AMM 79-21-09 PB 401 , DRY MOTORING CARRIED OUT, ENG RUN GROUND IDLE TEST 3 PERFORMED IAW AMM 71-00-00-795-003-N00. NO LEAKS FOUND ON ENG 2 AIR OIL HEAT EXCHANGER. OIL QTY & PX STABLE AT IDLE, ALL INDICATION OK. ABNORMAL EVENT SNAPSHOTS SENT TO ESCPP. WINDMILL INSP CARRIED OUT, REF LP 6744430, NO FAULTS FOUND. WITH CONSULTATION WITH TOMC AND POWERPLANT AIRCRAFT SERVICEABLE.