SDR ASAA2019112191384

Service difficulty report · Sensor · Boeing 737890

Difficulty date: November 19, 2019
Submitted: November 22, 2019
Operation: Air carrier
Aircraft: N534AS
Make and model: Boeing 737890
Aircraft serial: 35202
Aircraft time: 34,987 hours, 10,094 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Sensor
Condition: Contaminated
Location: Cockpit Temp
Stage of operation: NR
How discovered: O
Nature of condition: C, J
Precautionary procedure: O

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

What was found

CONT CAB - ZONE TEMP LIGHT ILLUMINATED ON RECALL. GROUNDED - YES. PERFORMED PZTC BITE PROCEDURE REF B737-800 AMM 21-51-00. #2 PZTC LOGGED A FLT DECK TRIM VALVE FAULT FOR PREV FLIGHT. RESET FAULT AND RAN BITE PROCEDURE AGAIN. NO CURRENT FAULTS. FOUND FLT DECK TEMP SENSOR COVERED WITH DUST. CLEANED FLT DECK TEMP SENSOR REF AMM 21-61-10 AND REPLACED SENSOR ASSY FILTER REF AMM 21-61-06. OPERATED PACKS FOR 20 MIN. OPS NORMAL.