# SDR DXTA2020062203781

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 19, 2020
- Submitted: June 22, 2020
- Operation: Air carrier
- Aircraft: [N763QS](https://openairdocs.org/aircraft/N763QS), registered now
- Make and model: Bombdr BD1001A10
- Aircraft serial: 20510
- Aircraft time: 6,013 hours, 3,530 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Part number: 3471A020000
- Part serial: 00593
- Condition: Failed
- Stage of operation: LD
- How discovered: O
- Nature of condition: C, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2020062203781

## Discrepancy

STRONG  SAVORY SCENT NOTICED WHILE APU PROVIDES CABIN AIR.  ON ROLLOUT AFTER LANDING, APU BEGAN TO INCREASE AIRFLOW STRONGLY & A SMALL AMOUNT OF SMOKE WAS SEEN,  SHUT OFF THE AIR SOURCE CONTROL.  FOUND THE ACM FAILED,  CAUSED BY RAM AIR CIRCUIT BLOCKAGE, REVEALED INSECT CONTAMINATION IN DUAL HEAT EXCHANGER.  R & R THE ACM WITH REPAIRED UNIT IAW AMM 21-52-13. R & R DUAL HEAT EXCHANGER WITH A NEW UNIT IAW AMM 21-52-09.  CLEANED, INSPECTED, AND REPLACED ALL SEALS ON ALL ASSOCIATED DUCTING.  ALL ACCESSED AREAS LEAK & OPS CHECKED GOOD,  NO DEFECTS NOTED. DURING RUN UP NOTED NO OIL, SAVORY, OR BAD SMELLS. CABIN & COCKPIT TEMPERATURE CAN NOW BE ADJUSTED TO BOTH HOT & COLD RANGES WITHOUT ISSUE.

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