Service difficulty report · Control Valve · Boeing 737890

Difficulty date
July 8, 2014
Submitted
July 10, 2014
Operation
Air carrier
Aircraft
N590AS
Make and model
Boeing 737890
Aircraft serial
35687
Aircraft time
24,938 hours, 7,646 cycles
Part
Control Valve
Part number
3989083
Part serial
10248
Condition
Failed
Location
Lt A/C Pack
Part time
24,964 hours, 7,654 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

LEFT PACK TRIP LIGHT EXTINGUISHES WITH MASTER CAUTION RESET. ACFT GROUNDED. CONTROLLER LOGGED THIS PACK TCV. TCV PASSED BITE, IT HAS SIGNIFICANT DRIVE TRAIN NOISE. REPLACED LT PACK TCV. OP CHECKED NORMAL IAW MM 21-51-10.