# SDR ASAA2022123141368

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 31, 2022
- Submitted: January 3, 2023
- Operation: Air carrier
- Aircraft: [N442AS](https://openairdocs.org/aircraft/N442AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43293
- Aircraft time: 33,764 hours, 10,684 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Bulb
- Part number: MS280341
- Condition: Faulty
- Location: Rt Acm Temp
- Stage of operation: CR
- 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/ASAA2022123141368

## Discrepancy

AFTER 4 HOURS IN CRUISE R PACK TEMP INDICATES LOW. NO ISSUES CONTROLLING CABIN TEMP NOTED. AT FL400, L PACK 32, R PACK 2, PAX CABIN 26. GROUNDED - YES. REPLACED RH PACK TEMP BULB PER B737-900 AMM 21-51-60. 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.