Service difficulty report · Control Valve · Boeing 737890

Difficulty date
December 19, 2017
Submitted
January 2, 2018
Operation
Air carrier
Aircraft
N589AS
Make and model
Boeing 737890
Aircraft serial
35686
Aircraft time
38,732 hours, 11,701 cycles
Part
Control Valve
Part number
3989083
Part serial
10179
Condition
Faulted
Location
Rt A/C Pack
Part time
38,823 hours, 11,725 cycles
Stage of operation
DE
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

DURING DESCENT, THE RT PACK LIGHT ILLUMINATED ON RECALL, OUT WITH RESET MASTER CAUTION. ACFT GROUNDED. ACCOMPLISHED PACK/ZONE TEMP CONT BITE. INTERMITTENT FAULT TCV. REMOVED AND REPLACED TCV IAW AMM 21-51-10. BITE CHECK CLEARS TCV PROBLEM NO LIGHTS IN THE COCKPIT.