SDR UALA2011092005081

Service difficulty report · Pressure Switch · Boeing 767322

Difficulty date: September 20, 2011
Submitted: October 13, 2011
Operation: Air carrier
Aircraft: N652UA
Make and model: Boeing 767322
Aircraft serial: 25390
Aircraft time: 83,409 hours, 13,409 cycles
Engine: Pwa PW4060
System (JASC): 2915 · Hydraulic Pressure Relief Valve, Main
Part: Pressure Switch
Condition: Faulty
Location: Fuel Pump
Stage of operation: NR
How discovered: O
Nature of condition: O
Precautionary procedure: O

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

What was found

LEFT HYD DEMAND PUMP FAILED TO OPERATE IN AUTO WITH ENGINE OFF. WORKS OK IN ON POSITION. -RDF-T :RPL S27 ELEC HYD PUMP L CONTROL PRESSURE SWITCH, NO HELP. REPLACED RELAYS K130, K134, & K131 NO HELP. REPLACED L DEMAND PUMP SWITCH ASSY S5, NO HELP. CHECKED WIRING BETWEEN RELAYS K130, K131 AND S25, S26 AND S27 OK REF WDM 29-11-12. REPLACE ENG PUMP LT PRESS SWITCH S26. OPS CHECK NORMAL.