# SDR AALA202309283701

- 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: Heat Exchanger
- Part number: 1828203
- Part serial: 5557
- Condition: Odor
- Location: Zone 100 - Fuse
- Part time: 32,325 hours
- Stage of operation: DE
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202309283701

## 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. **SUPPLEMENTAL REPORT FOR AALA202309262563: 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).

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