# SDR ASAA2022033037853

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 30, 2022
- Submitted: April 5, 2022
- Operation: Air carrier
- Aircraft: [N512AS](https://openairdocs.org/aircraft/N512AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 39043
- Aircraft time: 49,004 hours, 14,448 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: None
- Part number: 3989083
- Part serial: 6869
- Condition: Faulty
- Location: Left Ecs Bay
- Part time: 63,407 hours, 24,215 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/ASAA2022033037853

## Discrepancy

LEFT PACK ILLUMINATES ON MASTER CAUTION RECALL. GROUNDED - YES. ACCOMPLISHED PACK ZONE TEMPERATURE BITE PER B737-800 AMM 21-61-00-700-806-002 LH PACK FAULTED TEMP CONTROL VALVE. REMOVED AND REPLACED L/H TRIM MODULATING VALVE IAW AMM 21-61-21/401 OPS CHEK NORMAL.

---
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.