What was found
WHILE ACCOMPLISHING #1 PZTC BITE FOUND ZONE TRIM VALVE FAULT ON VERIFY. GROUNDED - YES. NO CURRENT FAULTS IN BACK SYSTEM. BITE CHECK RESET PROCEDURE CLEARED FAULT PER B737-900 AMM 21-51-00-700-803 AC OK FOR SERVICE.
- Difficulty date
- March 9, 2021
- Submitted
- March 12, 2021
- Operation
- Air carrier
- Aircraft
- N491AS
- Make and model
- Boeing 737990ER
- Aircraft serial
- 44109
- Aircraft time
- 19,970 hours, 6,401 cycles
- System (JASC)
- 2160 · Cabin Temperature Control System
- Part
- Valve
- Condition
- Faulted
- Location
- Zone Trim
- Stage of operation
- IN
- How discovered
- 9
- Nature of condition
- J
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.