SDR ASAA2014122010010

Service difficulty report · Controller · Boeing 737890

Difficulty date: December 20, 2014
Submitted: December 22, 2014
Operation: Air carrier
Aircraft: N531AS
Make and model: Boeing 737890
Aircraft serial: 35199
Aircraft time: 18,115 hours, 5,510 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Controller
Condition: Malfunctioned
Location: Cabin Temp
Stage of operation: NR
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

DURING MASTER CAUTION RECALL, CONTROLLER CABIN ZONE TEMP, AMBER, LIGHT ILLUMINATES. LIGHT EXTINGUISHES WITH MASTER CAUTION RESET. ACFT GROUNDED. NR 2 TEMP CONTROLLER SHOWS "FLT DECK TRIM VALVE" FAULT ON PREV FLT & BIT. VERIFY TEST PASSSES. RESET FAULT. FAULT DID NOT RETURN. NO HISTORY - 60 DAYS. BITE TEST NR 2 TEMP CONTROLLER GOOD, REF MM 21-61-00.