Service difficulty report · Modulating Valve · Boeing 737890

Difficulty date
January 14, 2019
Submitted
January 16, 2019
Operation
Air carrier
Aircraft
N590AS
Make and model
Boeing 737890
Aircraft serial
35687
Aircraft time
41,906 hours, 12,654 cycles
Part
Modulating Valve
Part number
3989085
Part serial
20993
Condition
Failed
Location
Ac Bay
Part time
16,142 hours, 5,136 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

AFTER START, RIGHT HAND PACK LIGHT ILLUMINATED ON RECALL. LIGHT EXTINGUISHED ON RESET. GROUNDED - YES. REPLACED RIGHT PACK TCV (V141) INSTALLATION TEST PASSES, NO LEAKS NOTED. REF AMM 21-51-10-400-801. GROUND VERIFICATION SUCCESSFUL.