# SDR XCGA201902270001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 22, 2019
- Submitted: February 27, 2019
- Operation: Air carrier
- Aircraft: N285DX
- Make and model: Gulstm G280
- Aircraft serial: 2026
- Aircraft time: 2,190 hours, 2,156 cycles
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Carbon Seal
- Condition: Leaking
- Location: Apu Engine
- Component: Apu, Hnywl, GTCP36150
- Component part number: 38007103
- Stage of operation: TX
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/XCGA201902270001

## Discrepancy

PILOTS REPORTED AN ODOR IN THE CABIN AND COCKPIT WHEN THE PACKS WERE SELECTED ON WHILE USING APU BLEED AIR. TROUBLESHOOTING REVEALED THE APU COMPRESSOR CARBON SEAL WAS FAULTY, ALLOWING OIL TO ENTER THE AIR SIDE OF THE APU AND SUBSEQUENTLY THE ACM AND CABIN AIR SYSTEM. THE AIRPLANE WAS MOVED TO THE SAVANNAH SERVICE CENTER FOR APU REPLACEMENT. GULFSTREAM INFORMED US THAT THIS IS A COMMON ISSUE WITH THE HONEYWELL GTCP 36-150 MODEL APUS.

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