What was found
NR 4 ENGINE SHUTDOWN DUE TO LOSS OF OIL PRESSURE. LANDED AT LAX UNDER AMBER ALERT. *S/D* CSD QUICK ATTACH DEVICE WORKED LOOSE CAUSING EXCESSIVE PRESSURE ON THE GEARBOX CARBON SEAL. SEAL CRACKED CAUSING OIL LOSS. SEALS WERE REPLACED.
- Difficulty date
- May 23, 1997
- Submitted
- March 26, 2000
- Operation
- Air carrier
- Aircraft
- N4728U
- Make and model
- Boeing 747122
- Aircraft serial
- 19925
- Engine
- Pwa JT9D7A
- System (JASC)
- 7260 · Turbine Engine Accessory Drive
- Part
- Carbon Seal
- Part number
- 647162602U
- Condition
- Damaged
- Location
- Nr 4 Engine
- Stage of operation
- DE
- Nature of condition
- Y, K, J
- Precautionary procedure
- E
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.