Service difficulty report · Modulating Valve · Boeing 737890

Difficulty date
December 27, 2009
Submitted
January 4, 2010
Operation
Air carrier
Aircraft
N557AS
Make and model
Boeing 737890
Aircraft serial
35176
Aircraft time
13,576 hours, 3,974 cycles
Part
Modulating Valve
Part number
3989083
Part serial
2556
Condition
Failed
Location
A/C Bay
Part time
39,965 hours, 19,920 cycles
Stage of operation
TX
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

CONT CABIN ZONE TEMP AMBER LIGHT ILLUMINATES ON RECALL. LIGHT EXTINGUISHES WITH MASTER CAUTION PRESSED. REMOVED AND REPLACED CONTROL CABIN TRIM MODULATING VALVE IN LT A/C BAY PER AMM 21-61-21-400-801. PERFORMED BITE CHECK AND LEAK CHECK PER AMM 21-61-21-400-801 STEP E. BITE CHECK AND LEAK CHECK GOOD.