# SDR ASAA2022021237402

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 12, 2022
- Submitted: February 15, 2022
- Operation: Air carrier
- Aircraft: [N448AS](https://openairdocs.org/aircraft/N448AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36356
- Aircraft time: 20,427 hours, 6,459 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: TX
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022021237402

## Discrepancy

ON RECALL AFTER ENGINE START CONTROL CABIN ZONE TEMP LIGHT ILLUMINATED. RESET WITH MASTER CAUTION RESET. GROUNDED - YES. BOTH PFTC'S GROUND TEST PASS, NO EXISTING FAULTS. FAULT HISTORY SHOWS INTERMITTENT FAULT 21-51117, 21-51123 "PFTC CTRL INOP" ON LEG 09. CABIN TEMP AND INDICATION GROUND VERIFICATION SUCCESSFUL B737-900 AMM 21-61-00-700-807-002.

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