# SDR AALA202101139030

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 5, 2021
- Submitted: January 13, 2021
- Operation: Air carrier
- Aircraft: [N989NN](https://openairdocs.org/aircraft/N989NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 33338
- Aircraft time: 14,259 hours, 5,750 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Duct
- Part number: 213A121192
- Condition: Blown
- Location: Lt A/C Pack
- Stage of operation: CL
- How discovered: O
- Nature of condition: E
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202101139030

## Discrepancy

AIRCRAFT WAS GROUNDED.  FLIGHT DIVERTED TO MEM DUE TO FLAPPING NOISE AND SLIGHT AIRFRAME VIBRATION, EMERGENCY WAS NOT DECLARED.  REPLACED LT PACK TEMPERATURE CONTROL VALVE DUCT, IAW AMM 21-51-10.  LEAK AND OPERATIONS 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.