SDR ASAA2022120141002

Service difficulty report · Warning Message · Boeing 737990ER

Difficulty date: December 1, 2022
Submitted: December 5, 2022
Operation: Air carrier
Aircraft: N493AS
Make and model: Boeing 737990ER
Aircraft serial: 41727
Aircraft time: 24,099 hours, 7,581 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Warning Message
Condition: False Activation
Location: Cockpit Temp
Stage of operation: NR
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

ZONE TEMP CONT CAB. RESET WITH RECALL. GROUNDED - YES. ON FIRST BITE ATTEMPT, "FLT DECK TRIM VALVE" LIGHT ILLUMINATED ON "BIT" STEP AND "PREV FLT" STEP, BUT EXTINGUISHED ON "VERIFY" STEP. 2ND ATTEMPT, "SRADA EXIT" LIGHT ILLUMINATED ON "VERIFY" STEP. CYCLED POWER, RAN BITE TWICE REF B737-900 AMM 21-61-00. FAULTS DID NOT REPRODUCE, BITE PASSED, AIRCRAFT SAFE TO RESUME SERVICE.