SDR ASAA201911131314

Service difficulty report · Valve · Boeing 737890

Difficulty date: November 12, 2019
Submitted: November 14, 2019
Operation: Air carrier
Aircraft: N589AS
Make and model: Boeing 737890
Aircraft serial: 35686
Aircraft time: 45,743 hours, 13,689 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Valve
Part number: 3989083
Part serial: 9754
Condition: Failed
Location: Lt A/C Pack
Part time: 44,987 hours, 13,732 cycles
Stage of operation: NR
How discovered: V
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

CONT CAB ZONE TEMP ILLUMINATED , RESETS WHEN MASTER CAUTION PRESSED. GROUNDED - YES. BITE CHK TEMP CONTROLLERS REF FIM 21-61 TASK 801. #2 CONTROLLER SHOWS "FLT DECK TRIM VALVE" FAULT. REMOVED AND REPLACED FLT DECK TRIM VALVE, REF B737-800 AMM 21-61-21. OP CHECK GOOD, BITE CHECK PASS, NO LEAKS NOTED.