# SDR ASAA2022112940960

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 29, 2022
- Submitted: November 30, 2022
- Operation: Air carrier
- Aircraft: [N486AS](https://openairdocs.org/aircraft/N486AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44107
- Aircraft time: 26,699 hours, 8,400 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Modulating Valve
- Part number: 3989083
- Part serial: 2911
- Condition: Faulted
- Location: Rt A/C System
- Part time: 82,337 hours, 34,454 cycles
- 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/ASAA2022112940960

## Discrepancy

RIGHT "PACK" LIGHT ILLUMINATED AT THE GATE. BOTH PACKS IN AUTO. ATTEMPTED "TRIP RESET". "PACK" LIGHT ILLUMINATED AGAIN. GROUNDED - YES. BITE OF #2 CONTROLLER SHOWS TCV FAULT ON VERIFY. PACK LIGHT COMES ON AFTER DEMAND IS PUT ON RIGHT PACK. REMOVED AND REPLACED R/H PACK TCV IAW B737-900 AMM 21-51-10. OP CHECKS NORMAL. BITE CHECK SHOWS NO FAULTS.

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