Service difficulty report · Pump · Boeing 777222

Difficulty date
May 10, 2008
Submitted
May 14, 2008
Operation
Air carrier
Aircraft
N798UA
Make and model
Boeing 777222
Aircraft serial
26928
Aircraft time
44,244 hours, 6,677 cycles
Engine
Pwa PW4090
Part
Pump
Part number
568129115004
Condition
Low Pressure
Location
Fuel System
Stage of operation
NR
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

FUEL PUMP L FWD LEFT FORWARD (BOOST) FUEL PUMP SWITCH ON AND PUMP OUTPUT PRESSURE LOW. STATUS MSG01, LATCHED CRUISE MODE DEPENDENT, L FWD FUEL BOOST PUMP PRESSURE SWITCH SIGNAL IS LOW WITH L FWD FUEL BOOST PUMP ON. DB- ELMS P310 ELECTRONICS UNIT MSG-2813111 LATCHED ER MODE. REPLACED LOW PRESSURE S-W, NO HELP. L-FWD FUEL BOOST PUMP INOP. REPLACED BOOST PUMP AND DAMAGED HOUSING. TESTS OKAY.