Service difficulty report · Modulating Valve · Boeing 737890

Difficulty date
July 23, 2019
Submitted
July 24, 2019
Operation
Air carrier
Aircraft
N594AS
Make and model
Boeing 737890
Aircraft serial
35191
Aircraft time
43,143 hours, 12,923 cycles
Part
Modulating Valve
Part number
3989085
Part serial
20383
Condition
Failed
Location
Ac Bay
Part time
20,407 hours, 6,035 cycles
Stage of operation
NR
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

RT PACK ANNUNCIATOR ILLUMINATED ON RECALL - RESET PACK AND MASTER BUT LIGHT REMAINED ILLUMINATED. GROUNDED - YES. PERFORMED BITE CK, GREEN GO LIGHT ILLUMINATED, RAN RT PACK FOR 5 MIN, REACCOMPLISHED BITE CK, RT PACK TCV FAULTED, ISOLATED FAULT TO THE RT PACK TRIM AIR MODULATING VALVE, REPLACED VALVE PER AMM 21-61-21-00-801, REACCOMPLISHED BITE CK PER AMM 21-61-00-700-806-002, GREEN GO LIGHT ILLUMINATED.