# SDR IPXA2026032798418

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 27, 2026
- Submitted: March 27, 2026
- Operation: Air carrier
- Aircraft: [N404UP](https://openairdocs.org/aircraft/N404UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 23726
- Aircraft time: 39,791 hours, 27,112 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Condition: Odor
- Stage of operation: IN
- How discovered: V
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2026032798418

## Discrepancy

EXHAUST SMELL COMING FROM PACKS RAN APU FOR AN HOUR WITH PACKS IN HOT AND THEN COLD, NO SMELLS NOTED, RAN EACH ENGINE AT IDLE WITH NO SMELLS NOTED, RAN EACH ENGINE AT TAKE-OFF POWER SETTINGS WITH PACKS IN HOT AND COLD TEMP SETTINGS, NO ABNORMAL SMELL WAS NOTED AT ANY PARAMETER. OK FOR SERVICE REF MM 21-00-01/301.

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