Service difficulty report · Pump · Boeing 747422

Difficulty date
April 19, 2009
Submitted
April 24, 2009
Operation
Air carrier
Aircraft
N171UA
Make and model
Boeing 747422
Aircraft serial
24322
Aircraft time
74,850 hours, 8,972 cycles
Engine
Pwa PW4056
Part
Pump
Part number
60B9260317
Condition
Failed
Location
Fuel System
Stage of operation
CR
How discovered
O
Nature of condition
K
Precautionary procedure
A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

FUEL LEAK UNDER LEFT WING. FLIGHT DIVERTED. UNWANTED FUEL TRANSFER CONFIRMED. FUEL TRANSFER FROM CENTER TO NR 2 MAIN, 500LB IN 10 MIN. OPENING NR 2 FOR TROUBLESHOOTING, FOUND NR 2 MAIN OVERRIDE JETTISON PUMP DISCHARGE CHECK VALVE BAD. REPLACED JETTISON PUMP. NEEDS OPS CHECK. OP CHECKS GOOD. NO UNWANTED TRANSFER NOTED.