# SDR ASAA2022110740663

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 7, 2022
- Submitted: November 8, 2022
- Operation: Air carrier
- Aircraft: [N468AS](https://openairdocs.org/aircraft/N468AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41735
- Aircraft time: 30,832 hours, 9,775 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Bulb
- Condition: Dirty
- 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/ASAA2022110740663

## Discrepancy

ZONE TEMP LIGHT CONT CAB ILLUMINATED ON RECALL. GROUNDED - YES. PERFORMED PZTC BITE ON CONT1/2 IAW B737-900 FIM 21-62 TASK 801. "FLT DECK - TRIM VALVE" RH CONT ON BIT, CLEARED (GREEN) ON VERIFY. CLEANED FLT DECK TEMP BULB IAW B737-900 AMM 21-61-10-100-801. PERFORMED OPS CHECK IAW AMM 21-61-00-700-807-002. LT NO LONGER PRESENT ON MASTER RECALL AT OVERHEAD. BOTH PACKS, ALL INDICATIONS NORMAL. RE-RAN BITE, NO FAULTS. TEMP BULB WAS VERY DIRTY, SUSPECTED AS CAUSE.

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