Service difficulty report · Modulating Valve · Boeing 737890

Difficulty date
April 15, 2023
Submitted
April 17, 2023
Operation
Air carrier
Aircraft
N593AS
Make and model
Boeing 737890
Aircraft serial
35107
Aircraft time
55,040 hours, 16,417 cycles
Part
Modulating Valve
Part number
3989085
Part serial
9751
Condition
Faulty
Location
Right Ecs Bay
Part time
56,342 hours, 16,441 cycles
Stage of operation
IN
How discovered
V
Nature of condition
J
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

WHILE TROUBLESHOOTING (ASA LP 60478264) FOUND RIGHT PACK TEMP CONTROL VALVE FAULTING. GROUNDED - YES. REPLACED RIGHT PACK TEMP CONTROL VALVE, BITE CHECK GOOD. REF B737-800 AMM 21-51-10.