SDR ASAA2016103018517

Service difficulty report · Valve · Boeing 737890

Difficulty date: October 30, 2016
Submitted: November 1, 2016
Operation: Air carrier
Aircraft: N593AS
Make and model: Boeing 737890
Aircraft serial: 35107
Aircraft time: 32,825 hours, 10,080 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Valve
Part number: 3989085
Part serial: 23926
Condition: Failed
Location: Ac Bay
Part time: 3,367 hours, 1,094 cycles
Stage of operation: NR
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

FWD CABIN ZONE TEMP, GOES OUT WITH RECALL. GROUNDED, YES. PERFORMED BITE TEST OF PACK/ZONE TEMP CONTROLLER. FOUND FAULT, ZONE TRIM VALVE ON NR 2 CONTROLLER WILL NOT CLEAR. REMOVED AND REPLACED FWD CABIN TRIM VALVE, REF AMM 21-61-21. BITE CHECK GOOD. LEAK CHECK GOOD.