# SDR 9JLA2017051914167

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 20, 2017
- Submitted: May 19, 2017
- Operation: Air carrier
- Aircraft: [N717CD](https://openairdocs.org/aircraft/N717CD), registered now
- Make and model: Cessna 560XL
- Registry model: [Cessna 560XL](https://openairdocs.org/model/cessna-560xl) (OpenAirDocs)
- Aircraft serial: 5605104
- Aircraft time: 5,416 hours, 4,498 cycles
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Carbon Seal
- Condition: Leaking
- Location: Apu Engine
- Component: Apu, Hnywl
- Component part number: 38007221
- Stage of operation: TX
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9JLA2017051914167

## Discrepancy

CREW REPORTED THAT WITH THE APU RUNNING AND THE APU BLEED AIR SELECTED ON ON SMOKE ENTERED CABIN. INITIAL FINDING DETERMINED THAT A COMPRESSOR CARBON SEAL FAILED AND ALLOWED ENGINE OIL TO ENTER THE BLEED AIR SYSTEM. THE APU WAS REMOVED FROM THE AIRCRAFT FOR REPAIRS.

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