Service difficulty report · Modulating Valve · Boeing 737990ER

Difficulty date
October 31, 2023
Submitted
November 2, 2023
Operation
Air carrier
Aircraft
N493AS
Make and model
Boeing 737990ER
Aircraft serial
41727
Aircraft time
27,262 hours, 8,532 cycles
Part
Modulating Valve
Part number
3989083
Part serial
2174
Condition
Faulty
Location
Rh Ecs Bay
Part time
86,439 hours, 44,040 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

RIGHT PACK LIGHT ILLUMINATED. EXTINGUISHES WHEN CLEARING MASTER CAUTION. GROUNDED - YES. (RESOLVED ON W/O: 1969863 TASKCARD: N/R-00006 ) PERFORMED PACK TEMPCONTROL BITEREF FIM 21-62 TASK 801FOUND P2TC THIS PACK TCV FAULT. TROUBLESHOT REF FIM 21-62 TASK 831REPLACED RIGHT TEMPERATIVE CONTROL VAVLE REF AMM 21-51-00 BITE TEST PASSED.REQUIRES REMAINDER OF INSTALLATION TEST AND LEAK CHECK 40029C/W LEAK CHECK 34023 OPS CHECK GOOD 53124 SEAMC PLACARD REMOVED MARCUS CONTACTED.