What was found
WHILE PERFORMING A PACK ZONE TEMP CONTROL BITE, CONTROLLER FAULTED THE LT TCV. WILL NOT RESET. ACFT GROUNDED. R & R THE LT PACK TEMP CONTROL VALVE IAW AMM 21-51-10. SYS OPS CHECKED NORMAL.
- Difficulty date
- December 30, 2017
- Submitted
- January 2, 2018
- Operation
- Air carrier
- Aircraft
- N481AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 44106
- Aircraft time
- 9,651 hours, 3,250 cycles
- System (JASC)
- 2150 · Cabin Cooling System
- Part
- Control Valve
- Part number
- 3989083
- Part serial
- 1440
- Condition
- Faulted
- Location
- Lt A./C Pack
- Part time
- 77,279 hours, 40,727 cycles
- Stage of operation
- IN
- How discovered
- C
- Nature of condition
- J, L
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.