Service difficulty report · Modulating Valve · Boeing 737890

Difficulty date
June 10, 2021
Submitted
June 15, 2021
Operation
Air carrier
Aircraft
N536AS
Make and model
Boeing 737890
Aircraft serial
35203
Aircraft time
34,370 hours, 9,883 cycles
Part
Modulating Valve
Part number
3989085
Part serial
26022
Condition
Overheated
Location
Left Ecs Bay
Part time
16,510 hours, 5,132 cycles
Stage of operation
DE
How discovered
O
Nature of condition
M
Precautionary procedure
O

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

What was found

REPORTS OF CONTROL CABIN AND LEFT PACK SUPPLY TEMP GETTING HOT DURING DECENT. GROUNDED - YES. ACCOMPLISHED TSR710904. FOUND NO DEFECTS. REPLACED THE LEFT TCV AS SUGGESTED IN TSR. WORK ACCOMPLISHED IAW B737-800 AMM 21-51-10/401. SEAMC JARED NOTIFIED.