- Difficulty date
- June 3, 2005
- Submitted
- June 14, 2005
- Operation
- Air carrier
- Aircraft
- N174UA
- Make and model
- Boeing 747422
- Aircraft serial
- 24381
- Aircraft time
- 59,164 hours, 6,675 cycles
- Engine
- Pwa PW4056
- Engine time
- 53,229 hours, 6,209 cycles
- Part
- Oil Cooler
- Condition
- Leaking
- Location
- Nr 4 Engine
- Stage of operation
- NR
- How discovered
- 9
- 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
FUEL LEAK NR 4 ENGINE. DIVERTED TO NARITA. CP07 AIR/OIL COOLER TUBE CRACKED. TUBE & CLAMPS WERE REPLACED. AGB REMOVED. SUSPECT AGB VIBRATION CAUSED TUBE CRACK. AGB TEARDOWN REVEALED NO DISCREPANCIES. ENGINE SUBSEQUENTLY REMOVED AS PRECAUTIONARY. SHOP INPUT POSTPONED INDEFINITELY.