# SDR DXTA2026032607361

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 22, 2026
- Submitted: March 26, 2026
- Operation: Air carrier
- Aircraft: [N513QS](https://openairdocs.org/aircraft/N513QS), registered now
- Make and model: Cessna 680A
- Registry model: [Cessna 680A](https://openairdocs.org/model/cessna-680a) (OpenAirDocs)
- Aircraft serial: 680A0046
- Aircraft time: 9,554 hours, 6,331 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Acm
- Part number: 741454175
- Condition: Odor
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2026032607361

## Discrepancy

DURING DEPARTURE CLIMBOUT WITH APU OFF CREW DETECTED AN EXHAUST/OILY SMELL WITH NO SMOKE INDICATED IN THE AIRCRAFT.  ON POST FLIGHT WITH APU RUNNING, ODOR PERSISTS.  ATTEMPTED TO DUPLICATE ODOR USING APU, LT ENG, & RT ENG. ODOR COULD NOT BE DUPLICATED.   BORESCOPE OF THE APU INLET COMPRESSOR. NO FINDINGS. MCC HAS ELECTED TO REPLACE ACM MUFFLER & CONDENSER OUTLET DUCT. TECHS REMOVED SUSPECT ACM MUFFLER AND ACM CONDENSER OUTLET DUCT AND INSTALLED RECEIVED CUSTOMER PROVIDED K-BALL UNITS. PERFORMED LEAK CHECKS WITH NO LEAKS NOTED. TECHS ALSO VERIFIED NO ABNORMAL SMELLS IN THE COCKPIT OR CABIN. ALL WORK IS DONE WITH REFERENCE TO AMM 21-50-65 AND 21-50-77.

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