# SDR ASAA2019022528297

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 22, 2019
- Submitted: February 26, 2019
- Operation: Air carrier
- Aircraft: [N492AS](https://openairdocs.org/aircraft/N492AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44110
- Aircraft time: 12,996 hours, 4,348 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Part serial: 20234
- Condition: Failed
- Location: Rt A/C Pack
- Part time: 15,360 hours, 7,832 cycles
- Stage of operation: NR
- 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/ASAA2019022528297

## Discrepancy

RT PACK LIGHT ILLUMINATED ON RECALL. GROUNDED - YES. REF B737-900 AMM 21-61-00-700-806-002, #2 PZTC BITE TEST FAULTED TCV, DUE PAST HISTORY, REQUIRES # 2 PACK TCV TO BE REPLACED. REMOVED AND REPLACED RH TEMP CONTROL VALVE REF AMM 21-51-10. NO LEAKS NOTED. OPS CHECK GOOD.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.