SDR ASAA2017030119977

Service difficulty report · Valve · Boeing 737990ER

Difficulty date: March 1, 2017
Submitted: March 3, 2017
Operation: Air carrier
Aircraft: N433AS
Make and model: Boeing 737990ER
Aircraft serial: 41704
Aircraft time: 13,478 hours, 4,378 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: Valve
Part number: 3989085
Part serial: 20753
Condition: Failed
Location: Lt A/C Pack
Part time: 12,120 hours, 3,954 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

CONTROL CABIN ZONE TEMP LIGHT ON RECALL. ACFT GROUNDED. REMOVED AND REPLACED ZONE TRIM AIR MODULATING VALVE IAW AMM 21-61-21, OPS CHECKED GOOD. ALTERNATE DEACTIVATION PROCEDURE USED IAW MPM CHAPTER 5, 5-07-01, TABLE 3, ITEM 1. LEAK CHECKED GOOD.