# SDR ASAA2020042732672

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 23, 2020
- Submitted: April 27, 2020
- Operation: Air carrier
- Aircraft: [N467AS](https://openairdocs.org/aircraft/N467AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36362
- Aircraft time: 22,916 hours, 7,477 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020042732672

## Discrepancy

"ZONE TEMP" FOR THE CONT CAB ILLUMINATED ON RECALL. LIGHT EXT UPON BEING RESET. GROUNDED - YES. PERFORMED BITE OF #1 AND #2 PACK ZONE TEMP CONTROLLER. FOUND FLIGHT DECK/CONT CAB TRIM AIR VALVE FAULT ON FIRST 2 LEGS, ON #2. NO FAULTS IN VERIFY TEST. OPERATED LEFT PACK AND FOUND PACK TEMP CONTROL OPERATES NORMALLY. NO FAULTS DURING TEST. CLEANED CONT CABIN TEMP SENSOR AND FILTER AS PRECAUTION REF B737-900 AMM 21-61-06-000-801. ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL. ALL MAINT ACCOMPLISHED PER B737-900 FIM 21-62 TASK 842. CONT CAB ZONE TEMP CONT CHECKS GOOD. NO FAULTS.

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