What was found
NR 1 HYD LOW QTY EICAS MESSAGE CAME ON AT .27 AND CONTINUED DOWN TO .17. FOLLOWED CHECKLIST PROCEDURES AND SHUTDOWN NR 1 EDP AND ADP. QUANTITIES AND PRESSURES FOR 2, 3 & 4 ARE NORMAL. REPLACED NR 1 ENG HYD PUMP, LEAK AND OPS CK GOOD.
- Difficulty date
- August 16, 2013
- Submitted
- August 21, 2013
- Operation
- Air carrier
- Aircraft
- N120UA
- Make and model
- Boeing 747422
- Aircraft serial
- 29166
- Aircraft time
- 59,101 hours, 6,847 cycles
- Engine
- Pwa PW4056
- System (JASC)
- 2913 · Hydraulic Pump (Electric/Engine), Main
- Part
- Pump
- Part number
- 65057
- Part serial
- 196
- Condition
- Faulty
- Location
- Nr 1 Hyd System
- Stage of operation
- IN
- How discovered
- V
- Nature of condition
- K
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.