What was found
DURING APPROACH WHEN THE LANDING GEAR WAS EXTENDED, THE NR 4 HYDRAULIC SYSTEM QUANTITY DROPPED TO ZERO. SECURED NR 4 HYDRAULIC SYSTEM AND LANDED WITHOUT INCIDENT. REPLACED THE LEFT WING GEAR DOWNLOCK ACTUATOR. OPERATIONAL CHECK OK.
- Difficulty date
- April 19, 1995
- Submitted
- March 26, 2000
- Operation
- Air carrier
- Aircraft
- N629US
- Make and model
- Boeing 747251F
- Aircraft serial
- 22388
- System (JASC)
- 3230 · Landing Gear Retraction/Extension System
- Part
- Dnlock Actuator
- Part number
- 69B8035827
- Condition
- Leaking
- Location
- Lt Mlg
- Stage of operation
- AP
- Nature of condition
- K, J
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.