SDR UALA2012113006879

Service difficulty report · Regulator Valve · Boeing 767322

Difficulty date: November 30, 2012
Submitted: December 28, 2012
Operation: Air carrier
Aircraft: N644UA
Make and model: Boeing 767322
Aircraft serial: 25094
Aircraft time: 91,169 hours, 14,485 cycles
Engine: Pwa PW4060
System (JASC): 2160 · Cabin Temperature Control System
Part: Regulator Valve
Condition: Faulty
Location: Temp Control
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

DIFFICULT TO CONTROL CABIN AND COCKPIT TEMPS, HAD TO SWITCH BETWEEN AUTO AND TRIM AIR OFF. REPLACED TRIM AIR REG VALVE. BECAUSE NO FAULTS WERE FOUND, REMOVED BOTH TRIM AIR CHECK VALVES, FOUND OK AND INSTALL PROPER, ALSO CHECKED SENSE LINE ON TRIM AIR REG VALVE.