# SDR ASAA2022032637781

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 26, 2022
- Submitted: April 7, 2022
- Operation: Air carrier
- Aircraft: [N590AS](https://openairdocs.org/aircraft/N590AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35687
- Aircraft time: 51,740 hours, 15,426 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: None
- Part number: 3989083
- Part serial: 21467
- Condition: Faulty
- Location: Left Ecs Bay
- Part time: 26,596 hours, 8,755 cycles
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022032637781

## Discrepancy

ZONE TEMP CONTROL CABIN ON RECALL AND RESETS. GROUNDED - YES. BOTH ZONE TEMP CONTLRS  LOGGED FLT DECK TRIM VALVE LAST LEG BUT TEST GOOD ON GND. REMOVED AND REPLACED CONTROL CABIN TRIM VALVE IAW B737-800 AMM 21-61-21-000-801, 21-61-21-400-801 LEAK CHECK AND OPS CHECK GOOD IAW B737-800 AMM 21-61-21-400-801, AND 21-61-00-700-806-002.

---
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.