Service difficulty report · Modulating Valve · Boeing 737890

Difficulty date
November 9, 2022
Submitted
November 14, 2022
Operation
Air carrier
Aircraft
N519AS
Make and model
Boeing 737890
Aircraft serial
36482
Aircraft time
49,870 hours, 14,656 cycles
Part
Modulating Valve
Part number
3989085
Part serial
11895
Condition
Faulted
Location
Rt Acm
Part time
47,674 hours, 13,988 cycles
Stage of operation
AP
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

AFT ZONE TEMP ILLUM ON APPROACH. RESET WITH RECALL. GROUNDED - YES. REMOVED AND REPLCAED ZONE TRIM AIR MODULATING VALVE PER B737-800 AMM 21-62-21-400-801 BITE TEST GOOD.