# SDR ASAA2020040932625

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 7, 2020
- Submitted: April 10, 2020
- Operation: Air carrier
- Aircraft: [N469AS](https://openairdocs.org/aircraft/N469AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41702
- Aircraft time: 22,381 hours, 7,234 cycles
- System (JASC): [2163 · Cabin Temperature Sensor](https://openairdocs.org/jasc/2163)
- Part: Switch
- Condition: Damaged
- Location: Cabin Temp
- 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/ASAA2020040932625

## Discrepancy

ZONE TEMP -CONT CAB ILLUMINATED ON MASTER CAUTION RECALL, ASSOCIATED ZONE TEMP-LIGHT EXTINGUISHED UPON MASTER CAUTION RESET. GROUNDED - YES. PERFORMED B737-900 FIM 21-62 TASK 842, PZTC 2 BITE SHOWS FLT DECK TRIM VALVE FAULT ON PREVIOUS FLT LEG, NO FAULTS ON VERIFY. REMOVED CONT CAB DUCT OVERHEAT SWITCH S931 FOR TROUBLESHOOTING, FOUND DAMAGED. REPLACED REF B737-900 AMM 21-61-05/401. OPS CHECK GOOD REF AMM 21-61-00-700-811-002. REPAIR CONFIRMATION SUCCESSFUL, ZONE TEMP LIGHT DOES NOT ILLUMINATE. RAN BOTH PACKS AT VARYING TEMPS FOR 5 MINUTES, NO FAULTS FOUND. ETOPS GROUND VERIFICATION SUCCESSFUL.

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