What was found
DURING CRUISE, THE NR 4 HYDRAULIC QUANTITY INDICATION SLOWLY DECREASED. AIRCRAFT DIVERTED TO SEA AND LANDED WITHOUT INCIDENT. REPLACED THE AUXILIARY HYDRAULIC CONTROL MODULE. OPERATIONAL CHECK GOOD.
- Difficulty date
- June 28, 1999
- Submitted
- March 26, 2000
- Operation
- Air carrier
- Aircraft
- N251F
- Make and model
- Boeing 747251B
- Aircraft serial
- 22388
- System (JASC)
- 2910 · Hydraulic System, Main
- Part
- Module
- Part number
- 6984610835
- Condition
- Failed
- Location
- Nr 4 Hyd System
- Stage of operation
- CR
- Nature of condition
- N
- Precautionary procedure
- A
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.