Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
September 20, 2017
Submitted
September 25, 2017
Operation
Air carrier
Aircraft
N461AS
Make and model
Boeing 737990ER
Aircraft serial
36363
Aircraft time
14,065 hours, 4,610 cycles
Part
Control Valve
Part number
3989085
Part serial
24422
Condition
Failed
Location
Rt A/C Pack
Part time
8,919 hours, 2,912 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

AIR CONDITIONING ANNUNCIATOR ILLUMINATED ON RECALL, CHECK WITH RIGHT PACK ILLUMINATED ON OVERHEAD PANEL. ACFT GROUNDED. CONFIRMED FAULT. RIGHT PACK ILLUMINATED ON P-5 PANEL ON RECALL. PERFORMED ZONE TEMP CONTROL BITE TEST IAW FIM 21-61, TASK 801. RIGHT CONTROL SHOWS FAULT FOR PACK TCV. RESET FAULT. RUN PACKS AND FAULT RETURNED. R & R RIGHT PACK TCV IAW MM 21-51-10/401. RESET FAULTS. OPS NORMAL. RAN PACKS. NO FAULTS.