SDR ASAA2015030210830

Service difficulty report · Valve · Boeing 737890

Difficulty date: March 2, 2015
Submitted: March 4, 2015
Operation: Air carrier
Aircraft: N536AS
Make and model: Boeing 737890
Aircraft serial: 35203
Aircraft time: 12,420 hours, 3,625 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Valve
Part number: 3989083
Part serial: 6684
Condition: Malfunctioned
Location: A/C Bay
Part time: 41,946 hours, 15,330 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

CONTROL CABIN ZONE TEMP LIGHT COMES ON DURING RECALL WITH MASTER CAUTION LIGHT. ACFT GROUNDED. ACCOMPLISHED PACK/ZONE TEMPERATURE CONTROLLER BITE TEST, NR 2 CONTROLLER INDICATES FLT DECK TRIM VALVE FAULT, REF MM 21-61-00-700-806-002. REPLACED FLT DECK TRIM VALVE, OPS TEST NORMAL, NO LEAKS NOTED, REF MM 21-61-21-400-801.