SDR ASAA2015111513783

Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date: November 15, 2015
Submitted: November 17, 2015
Operation: Air carrier
Aircraft: N457AS
Make and model: Boeing 737990ER
Aircraft serial: 36355
Aircraft time: 6,999 hours, 2,281 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Control Valve
Part number: 3989084
Part serial: 20930
Condition: Failed
Location: A/C Bay
Part time: 7,013 hours, 2,285 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

ON MASTER CAUTION RECALL, ZONE TEMP CONT CAB ILLUMINATED AND EXTINGUISHED ON RESET. ACFT GROUNDED. ACCOMPLISHED PACK TEMP CONTROL BITE, FLT DECK TRIM VALVE LIGHT ILLUMINATED ON NR 2 PACK, ZONE TEMP CONTROLLER, REF FIM 21-62, TASK 801. R & R CONTROL CABIN TRIM AIR MODULATING VALVE, OPS TEST NORMAL REF FIM 21-62, TASK 832 AND MM 21-61-21.