SDR ASAA2015111713823

Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date: November 17, 2015
Submitted: November 23, 2015
Operation: Air carrier
Aircraft: N457AS
Make and model: Boeing 737990ER
Aircraft serial: 36355
Aircraft time: 7,013 hours, 2,285 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Control Valve
Part number: 3989083
Part serial: 9171
Condition: Failed
Location: Lt A/C Pack
Part time: 31,375 hours, 9,623 cycles
Stage of operation: NR
How discovered: 9
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

OBSERVED CONTROLLER CABIN ZONE TEMP LIGHT ON RECALL, EXTINGUISHED WITH MASTER CAUTION RESET. ACFT GROUNDED. ACCOMPLISHED PACK TEMP CONTROL BITE CK, NR 1 & NR 2 PACK/ZONE TEMP CONTROLLER FAULTED, FLT DECK TRIM AIR VALVE, REF FIM 21-62, TASK 801. R & R FLT DECK TRIM AIR VALVE, OPS CHECK GOOD, NO LEAKS, REF AMM 21-61-21 AND FIM TASK 21-62, TASK 832.