SDR ASAA2021031234295

Service difficulty report · Valve · Boeing 737990ER

Difficulty date: March 12, 2021
Submitted: March 16, 2021
Operation: Air carrier
Aircraft: N413AS
Make and model: Boeing 737990ER
Aircraft serial: 35205
Aircraft time: 30,053 hours, 9,624 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Valve
Condition: Malfunctioned
Location: Cockpit Temp
Stage of operation: TX
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

ON MASTER CAUTION RECALL AFTER ENGINE START, ZONE TEMP ON CONT CABIN ILLUMINATED, AND RESET. GROUNDED - YES. VERIFIED - PERFORMED B737-900 FIM 21-62 TASK 801 TEMP CNTL BITE SHOWS FLT DECK TRIM VALVE FAULT ON BIT AND LAST FLT. PERFORMED FIM 21-62 TASK 832, VERIFY BITE TEST SHOWS GOOD, INITIAL EVALUATION TEST GOOD. INTERMITTENT FAULT. GROUND VERIFICATION CHK GOOD.