Service difficulty report · Modulating Valve · Boeing 737890

Difficulty date
June 4, 2023
Submitted
June 7, 2023
Operation
Air carrier
Aircraft
N583AS
Make and model
Boeing 737890
Aircraft serial
35681
Aircraft time
55,496 hours, 16,220 cycles
Part
Modulating Valve
Part number
3989085
Part serial
26612
Condition
Faulted
Location
Right Ecs Bay
Part time
23,971 hours, 7,783 cycles
Stage of operation
NR
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

RH PACK H ILLUMINATED ON RECALL AND EXTINGUISHES WHEN MC RESET. GROUNDED - YES. BITE CHECK OF #1 & #2 PZTC. #1 NO FAULTS, #2 FAULTED TCV THIS PACK. VERIFY GREEN GO LT ILLUMINATED AND FAULT RESET. DUE HISTORY REPLACED RIGHT PACK TEMP CONTROL VALVE V141, LEAK AND OPS CHECKS OK. BITE #2 PZTC NO FAULTS. REF B737-800 FIM 21-53 TASK 821, 21-62 TASK 801 & 831, & B737-800 AMM 21-51-01.