SDR ASAA2018112627051

Service difficulty report · Valve · Boeing 737990ER

Difficulty date: November 20, 2018
Submitted: November 27, 2018
Operation: Air carrier
Aircraft: N440AS
Make and model: Boeing 737990ER
Aircraft serial: 41705
Aircraft time: 20,386 hours, 6,743 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Valve
Part number: 3989083
Part serial: 2251
Condition: Failed
Location: Cockpit Temp
Part time: 84,124 hours, 37,899 cycles
Stage of operation: NR
How discovered: 9
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 RECALL CONT CAB ZONE TEMP LIGHT. GROUNDED - YES. PERFORMED BITE REF B737-900 AMM 21-61-00-700-806-002, SHOWS FLT DECK TRIM VALVE FAULT. REMOVED AND REPLACED FLIGHT DECK TRIM VALVE REF AMM 21-61-21-400-801, FLT DECK TRIM VALVE OPERATES, BITE, AND LEAK CHECK GOOD. GROUND VERIFICATION SUCCESSFUL.