# SDR ASAA2020101033325

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 10, 2020
- Submitted: October 12, 2020
- Operation: Air carrier
- Aircraft: [N536AS](https://openairdocs.org/aircraft/N536AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35203
- Aircraft time: 32,447 hours, 9,350 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Condition: Malfunctioned
- Location: Cabin Temp
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020101033325

## Discrepancy

AIR COND CONT CABIN ZONE TEMPERATURE LIGHT ON RECALL AFTER START.  GROUNDED-YES.  BITE CHECKED BOTH ZTC'S, REF B737-800 FIM 21-62 TASK 801.  NR 1, NO FAULTS.  NR 2 FAULTS CONT CABIN TRIM VALVE.  PERFORMED B737-800 FIM 21-62 TASK 832, FAULT RESETS.  RAN VERIFY TEST NUMEROUS TIMES W/NO DEFECTS.  ETOPS GROUND VERIFICATION TEST PASS.

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