SDR UIEA2017122602438

Service difficulty report · Oil System · Boeing 747481

Difficulty date: December 25, 2017
Submitted: December 28, 2017
Operation: Air carrier
Aircraft: N429MC
Make and model: Boeing 747481
Aircraft serial: 24833
Aircraft time: 98,185 hours, 14,197 cycles
Engine: Ge CF680C2B1F
Engine time: 11,631 hours, 2,254 cycles
System (JASC): 7261 · Turbine Engine Oil System
Part: Oil System
Condition: Leaking
Location: Nr 1 Engine
Stage of operation: CR
How discovered: B
Nature of condition: K, B
Precautionary procedure: O

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

What was found

OIL ODOR FROM THE NR 1 PACK, NR 1 ENGINE OIL QTY DOWN TO 7 INFLIGHT. MX PERFORMED BOROSCOPE INSPECTION OF THE NR 1 ENGINE, OIL STAINING NOTED IN HIGH PRESSURE COMPRESSOR, NR 1 ENGINE REPLACED, PRECOOLER INSPECTED, NO FAULTS NOTED. NR 1 & 2 PACKS, & NR 3 COALESCER BAGS REPLACED.