Service difficulty report · Oil System · Boeing 75733N

Difficulty date
August 15, 2025
Submitted
August 18, 2025
Operation
Air carrier
Aircraft
N77865
Make and model
Boeing 75733N
Aircraft serial
32589
Aircraft time
72,040 hours, 21,364 cycles
Part
Oil System
Condition
Overserviced
Location
Apu
Stage of operation
TX
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

FAULT LIGHT ON DURING APU START. SECOND ATTEMPT MADE AFTER CLEARING FAULT. PERFORMED APU ECB BITE IAW FIM 49-11 TASK 875 & NOTED LOW OIL PRESSURE FLAG ON LAST 3 RUNS. REJECTED HMG MUST WORK DISREGARD PREVIOUS CALL, CONFIG ISSUE, HMG CURRENTLY FUNCTIONAL OPS CHECKED GOOD. NO APU DOOR MSG, VERIFIED APU INTAKE DOOR IS CLOSED & THE EICAS STATUS MESSAGE APU DOOR IS NOT DISPLAYED. VERIFIED THE HMG OPS NORMAL IAW AMM 24-25-00/501. LOW OIL PRESS BITE FIM 49-11/881. ADJ M&L TO 4 COMPLIED WITH 49-11 FAULT TREE 881, FOUND APU OIL LEVEL ABOVE FULL LINE. REMOVED FILL CAP & OIL OVERFLOWED OUT OF PORT. SIPHENED OIL & FOUND NO EVIDENCE OF FUEL ODOR. RAN APU 3 TIMES, OPS CHECK GOOD WITH NO FAULTS FOUND.

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