SDR ASAA2020102833434

Service difficulty report · Warning Message · Boeing 737890

Difficulty date: October 28, 2020
Submitted: October 29, 2020
Operation: Air carrier
Aircraft: N563AS
Make and model: Boeing 737890
Aircraft serial: 35180
Aircraft time: 51,107 hours, 15,167 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Warning Message
Condition: False Activation
Location: Cockpit Temp
Stage of operation: TX
How discovered: O
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

ON TAXI OUT IN SEA, WE GOT THE CONT CABIN "ZONE TEMP" LIGHT. RAN THE QRH AND THE LIGHT EXTINGUISHED. THEN ON CLIMBOUT, WE GET THE SAME "ZONE TEMP" LIGHT. RAN QRH AGAIN AND THE LIGHT EXTINGUISHED. THE LIGHT COMES BACK ON MASTER CAUTION RECALL. GROUNDED-YES. PERFORMED PACK TEMP. CONTROL BITE CHECK, REF B737-800 FIM 21-62 TASK 801. FOUND FLIGHT DECK TRIM VALVE LIGHT ON, ON TEMP CONTROL NR 2, RESET. PERFORMED BITE CHECK AGAIN. OPERATIONS CHECKED GOOD.