SDR ASAA2016042716545

Service difficulty report · Warning Light · Boeing 737990ER

Difficulty date: April 27, 2016
Submitted: April 29, 2016
Operation: Air carrier
Aircraft: N495AS
Make and model: Boeing 737990ER
Aircraft serial: 41728
Aircraft time: 589 hours, 196 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Warning Light
Condition: False Activation
Location: Cabin Temp
Stage of operation: NR
How discovered: 9
Nature of condition: N
Precautionary procedure: O

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

What was found

"ZONE TEMP" LIGHT FOR CABIN CONTROL. RESETS WITH MASTER RECALL. ACFT GROUNDED. REF AMM 21-61-00 PACK FLOW TEMP CONTROLLER BITE, CABIN TEMP & INDICATIONS OPS TEST, NO FAULTS DETECTED AFTER BITE. OPS TEST NORMAL. OPERATED PACKS, COULD NOT DUPLICATE FAULT. AS A PRECAUTION CLEANED CABIN TEMP SENSOR FILTERS, REF AMM 21-61-06.