Service difficulty report · Control Valve · Boeing 737990ER

Difficulty date
September 17, 2017
Submitted
September 19, 2017
Operation
Air carrier
Aircraft
N492AS
Make and model
Boeing 737990ER
Aircraft serial
44110
Aircraft time
7,278 hours, 2,493 cycles
Part
Control Valve
Part number
3989083
Part serial
2174
Condition
Failed
Location
Rt A/C Pack
Part time
67,007 hours, 38,200 cycles
Stage of operation
CL
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

RIGHT PACK LIGHT ILLUMINATED AT 2000 FT. RAN CHECKLIST. ISOLATED RIGHT PACK BY TURNING IT OFF IAW CHECKLIST. CONTINUED TO DESTINATION. ACFT GROUNDED. TROUBLESHOT THE SYSTEM AND FOUND THE NR 2 TCV FAILED. REPLACED THE RT NR 2 TCV IAW AMM 21-61-21-400-801. COMPLETED BITE CHECK, GREEN GO LIGHT ILLUMINATED.