# SDR 97UAL900527

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 10, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N1842U
- Make and model: Doug DC-10-10
- Registry model: [Doug DC-10-10](https://openairdocs.org/model/mcdonnell-douglas-dc-10-10) (OpenAirDocs)
- Aircraft serial: 46635
- Engine: Ge CF66D
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: O-Ring
- Condition: Cut
- Location: Speed Sensor
- Stage of operation: NR
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97UAL900527

## Discrepancy

PUNGENT ODOR/SMOKE IN AIRCRAFT ON ENGINE PNEUMATICS AT HIGH ENGINE POWER.  *S/D*  FOUND APU SPEED SENSOR (MONOPOLE) O-RING CUT AND OIL LEAKING INTO THE COMPRESSOR AREA.  REPLACED O-RINGS AND BURNED OUT PACKS.  CHECKED OUT OK.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.