SDR 2007UALA01788

Service difficulty report · Shutoff Valve · Boeing 767322

Difficulty date: June 1, 2007
Submitted: June 6, 2007
Operation: Air carrier
Aircraft: N670UA
Make and model: Boeing 767322
Aircraft serial: 29240
Aircraft time: 27,519 hours, 7,520 cycles
Engine: Pwa PW4052
System (JASC): 2160 · Cabin Temperature Control System
Part: Shutoff Valve
Condition: Malfunctioned
Location: Cabin Temp
Stage of operation: CR
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

CABIN TEMPERATURE CONTROL UNACCEPTABLE IN MANUAL. [07-13-07] AFTER EXTENSIVE TROUBLESHOOTING, R & R TRIM AIR PRSOV PER MM21-61-06, LEAK & OP CHECKED GOOD, BUT PROBLEM REOCCURRED. AFTER MORE TROUBLE-SHOOTING, REPLACED RELAY K629. SYSTEM FINALLY WORKED OK.