SDR UALA2011060902834

Service difficulty report · Pump · Boeing 767322

Difficulty date: June 9, 2011
Submitted: June 10, 2011
Operation: Air carrier
Aircraft: N670UA
Make and model: Boeing 767322
Aircraft serial: 29240
Aircraft time: 42,376 hours, 11,119 cycles
Engine: Pwa PW4056
System (JASC): 2913 · Hydraulic Pump (Electric/Engine), Main
Part: Pump
Condition: Malfunctioned
Location: Hydraulic Sys
Stage of operation: IN
How discovered: O
Nature of condition: J
Precautionary procedure: D

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

What was found

AIR DEMAND PRESS LIGHT ILLUMINATED AND EICAS C HYD DEM PUMP. CTR AIR DEMAND PMP INOP, CYCLED BREAKER, RESET OVERSPEED SWITCH, NO HELP. NEEDS FURTHER TROUBLESHOOTING. SUSPECT PUMP INOP. NO EXHAUST AIR OUT OF PUMP. REPLACED OVERSPEED CARD M1 057, NO HELP. REPLACED ADP PER AMM. PUMP RUNS, MAKING LOUD SQUEALING NOISES, WITH ONLY 1350-1450 PSI. RESET NO HELP. INSTALLED NEW ADP PER MM. OP CK'D LEAK, CKS OK.