# SDR DXTA2023051786410

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 16, 2023
- Submitted: May 17, 2023
- Operation: Air carrier
- Aircraft: [N571QS](https://openairdocs.org/aircraft/N571QS), registered now
- Make and model: Cessna 680A
- Registry model: [Cessna 680A](https://openairdocs.org/model/cessna-680a) (OpenAirDocs)
- Aircraft serial: 680A0126
- Aircraft time: 5,496 hours, 3,593 cycles
- System (JASC): [2100 · Air Conditioning System](https://openairdocs.org/jasc/2100)
- Part: Unknown
- Condition: Unknown
- Location: Unknown
- Stage of operation: TO
- 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/DXTA2023051786410

## Discrepancy

AFTER TAKEOFF, A STRONG ODOR OF BURNING. INSPECTED CABIN, & SMELL FOUND THROUGHOUT ACFT.  AFTER CLEARING.  PRESSURIZED W/CHERRY PICKER,  BURNING ODOR RETURNED STRONGER. DIVERTED, & FIRE DEPART COULD NOT FIND SOURCE,  AFTER F/D CLEARED ACFT, TURNED APU ON, & SELECTED APU BLEED, ACFT FILLED WITH A STRONG BURNING ODOR.  C/W TC-C68-49-1001 RE100CS BORESCOPE OF APU COMPRESSOR AREA FOR OIL LEAKAGE/COKING & TC-68A-21-181006M ENVIRON CONTROL SYS BLEED DUCT BURN, NO DEFECTS. R & R CABIN HEPA FILTER IAW TC-68A-21-181006M.  INSPECTED BLEED DUCT RESTRICTOR, NO DEFECTS.   MEASURED DRAG TORQUE ON ACM BEARING. BEARING DRAG MEASURED AT 112 OZ-IN. APU ON MEL IAW MEL CH 49-20-01. NO DEFECTS & NO ABNORMAL ODORS.

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