What was found
DURING CLIMB, THE HYDRAULIC FLUID IN THE NR 4 HYDRAULIC SYSTEM DECREASED. AIRCRAFT RETURNED TO NRT AND LANDED WITHOUT INCIDENT. SECURED HYDRAULIC LINE ON NR 4 AIR DRIVEN PUMP AUTO PRESSURE CONTROL SWITCH. OPERATIONAL CHECK GOOD.
- Difficulty date
- December 5, 1996
- Submitted
- March 26, 2000
- Operation
- Air carrier
- Aircraft
- N603US
- Make and model
- Boeing 747151
- Aircraft serial
- 19780
- System (JASC)
- 2910 · Hydraulic System, Main
- Part
- Hyd Line
- Condition
- Leaking
- Location
- Nr 4 Hyd Syst
- Stage of operation
- CL
- 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.