Service difficulty report · Oil System · Boeing 747422

Difficulty date
July 20, 2007
Submitted
July 24, 2007
Operation
Air carrier
Aircraft
N177UA
Make and model
Boeing 747422
Aircraft serial
24384
Aircraft time
71,210 hours, 8,919 cycles
Engine
Pwa PW4056
Engine time
52,428 hours, 6,133 cycles
Part
Oil System
Condition
Low
Location
Nr 4 Engine
Stage of operation
CR
How discovered
O
Nature of condition
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

RTFL DUE TO NR 4 ENGINE OIL QUANTITY LOW & PRESSURE DECREASING. [08-14-07] GROUND CHECK FOUND OIL LEAKING AT NR 4 BEARING PRESSURE TUBE HOUSING. REPLACED TUBE AND HOUSING PER MM 72-54-02. ACP'D ENG IDLE RUNNING LEAKS CHECK PER AMM 71-00-00 -501 TEST NR 3. NO LEAKS FOUND. OIL PRESS SHOWS 113 AND OIL TEMP SHOWS 102 AFTER ENG RUNNING AT IDLE FOR 10 MINUTES. APPLIED WINDMILLING CHECKS. AIRPLANE RETURNED TO SERVICE.