What was found
DURING CRUISE, THE NR 4 HYDRAULIC SYSTEM QUANTITY DECREASED. AIRCRAFT DIVERTED TO ANC AND LANDED WITHOUT INCIDENT. REPLACED THE NR 4 ENGINE DRIVEN HYDRAULIC PUMP, OPERATIONAL CHECK GOOD.
- Difficulty date
- September 15, 1999
- Submitted
- March 26, 2000
- Operation
- Air carrier
- Aircraft
- N624US
- Make and model
- Boeing 747251B
- Aircraft serial
- 21706
- System (JASC)
- 2913 · Hydraulic Pump (Electric/Engine), Main
- Part
- Pump
- Part number
- 887673
- Condition
- Leaking
- Location
- Nr 4 Engine
- Stage of operation
- CR
- Nature of condition
- K, J
- Precautionary procedure
- A
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.