What was found
UNWANTED FUEL TRANSFER FROM NR 2 MAIN TANK TO CENTER AFTER CENTER PUMPS SHUT OFF PER NORMAL PROCEDURE. POSSIBLE CHECK VALVE ALLOWING TRANSFER. REPLACED SCAVENGE SYSTEM FUEL LINE (180-1011) IAW MM.
- Difficulty date
- November 27, 2011
- Submitted
- November 30, 2011
- Operation
- Air carrier
- Aircraft
- N199UA
- Make and model
- Boeing 747422
- Aircraft serial
- 28717
- Aircraft time
- 57,828 hours, 6,835 cycles
- Engine
- Pwa PW4056
- System (JASC)
- 2824 · Fuel Transfer Valve
- Part
- Line
- Part number
- 343U102335
- Condition
- Faulty
- Location
- Scavenge System
- Stage of operation
- NR
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.