SDR ASAA1159048

Service difficulty report · Valve · Boeing 737890

Difficulty date: February 15, 2011
Submitted: February 23, 2011
Operation: Air carrier
Aircraft: N596AS
Make and model: Boeing 737890
Aircraft serial: 35688
Aircraft time: 10,671 hours, 3,444 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Valve
Part number: 32149721
Part serial: 2249
Condition: Failed
Location: Ac Bay
Part time: 10,685 hours, 3,447 cycles
Stage of operation: NR
How discovered: O
Nature of condition: O
Precautionary procedure: K

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

What was found

AIR TEMPERATURE "FORWARD CAB" AND" AFT CAB NOT RESPONSIVE IN FLIGHT HAD TO CONTINUALLY INCREASE THE CONTROLS ON BOTH ALL THE WAY FULL TO MAINTAIN 21 DEG C TURNED THE CONTROLLERS TO THE OFF POSITION TRIM AIR SWITCH TO ON AS WELL AS LEFT AND RIGHT RECIRC FANS IN AUTO TEMP IN CABIN WAS SLIGHTLY COLDER THAN NORMAL FORE AND AFT CABIN. FOUND TRIM AIR REG AND SHUT OFF VALVE NOT OPENING. REPLACED TRIM AIR PRESS & REGULATING & SHUT OFF VALVE PER AMM 21 62 01. OPS & LEAK CHECKS GOOD.