# SDR U5QA202608180176

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 18, 2026
- Submitted: August 25, 2026
- Operation: Air carrier
- Aircraft: [N551XJ](https://openairdocs.org/aircraft/N551XJ), registered now
- Make and model: Bombdr BD1001A10
- Aircraft serial: 20324
- Aircraft time: 16,101 hours, 7,299 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Part number: 3471A020000
- Part serial: 00227
- Condition: Seized
- Location: Zone 100
- Stage of operation: TX
- 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/U5QA202608180176

## Discrepancy

CREW REPORTS, THAT THEY WERE ON THE RAMP WITH THE APU RUNNING, AND AFTER THEY SELECTED THE CABIN AIR ON, THEY GOT AN ACRID SMELL AND SMOKE IN THE CABIN.  MX C/A: REMOVED AND REPLACED ACM WITH REPAIRED UNIT. PERFORMED SATISFACTORY OPERATIONAL CHECK. REFERENCED AMM 21-52-13.

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