SDR UALA2011042602018

Service difficulty report · Shutoff Valve · Boeing 767322

Difficulty date: April 25, 2011
Submitted: May 2, 2011
Operation: Air carrier
Aircraft: N667UA
Make and model: Boeing 767322
Aircraft serial: 29239
Aircraft time: 45,615 hours, 12,499 cycles
Engine: Pwa PW4056
System (JASC): 7500 · Engine Bleed Air System
Part: Shutoff Valve
Part number: 79027013
Part serial: 277
Condition: Faulty
Location: Right Engine
Stage of operation: DE
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

RIGHT ENGINE DUCT PRESSURE CYCLES FROM 25-40 PSI IN DESCENT. RIGHT ENGINE HPSOV INOPERATIVE PER MEL. DECAY CHECK RT HPSOV SENSE LINE TO HPC-NO LEAKS, HPSOV OPENS AT 6-8 PSI WITH BLEED REG PRESSURE TESTER HOOKED UP, AIR SUPPLY BITE MODULE SHOWS RT HPC BITE SWITCH FAULT, WOULD NOT RESET, NO TIME TO FURTHER TROUBLESHOOT. REPLACED RT HPSOV PER MM, LEAK CHECKED GOOD.