# SDR AALA202309282070

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 23, 2023
- Submitted: September 28, 2023
- Operation: Air carrier
- Aircraft: [N938AN](https://openairdocs.org/aircraft/N938AN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29533
- Aircraft time: 63,728 hours, 26,792 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Plenum
- Part number: 22156283
- Condition: Odor
- Location: Zone 100 - Fuse
- Stage of operation: DE
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202309282070

## Discrepancy

AIRCRAFT WAS GROUNDED: ON DESCENT NOTICE HOT ODOR SMELL IN THE COCKPIT. ADDITIONALLY, WINDOWS FOGGED UP, AND LEFT PACK LIGHT ILLUMINATED AND TEMP WAS PEGGED AT 200 DEGREES.  MAINTENANCE REPLACED THE LEFT HAND PACK PRIMARY HEAT EXCHANGER (AALA202309262563), THE SECONDARY HEAT EXCHANGER (AALA202309283701), AND THE PLENUM / DIFFUSER ASSEMBLY (AALA202309282070) PER JOB CARD 08L13121001. REPLACED THE LEFT HAND AIR CYCLE MACHINE PER AMM 21-51-04 (AALA202309285092). ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK.** (CLOSED).

---
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.