# SDR 95ZZZX6927

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 4, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N4706A
- Make and model: Cessna P210N
- Registry model: [Cessna P210N](https://openairdocs.org/model/cessna-p210n) (OpenAirDocs)
- Aircraft serial: P21000817
- System (JASC): [3720 · Vacuum Indicating System](https://openairdocs.org/jasc/3720)
- Part: Gauge
- Part number: C668519L0105
- Condition: Contaminated
- Location: Inst Panel Vac
- Part time: 717 hours
- Component: Airborne, 44CW
- Stage of operation: NR
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/95ZZZX6927

## Discrepancy

THE AIRCRAFT IS EQUIPPED WITH A DUAL VACUUM SYSTEM.  THE SUCTION GAUGE FILLED WITH CARBON DUST DURING A VACUUM PUMP FAILURE.  THIS OBSCURED THE PILOT'S INDICATION OF A LEFT OR RIGHT VACUUM PUMP FAILURE (RED BALL), SINCE THE GAUGE STILL SHOWED VACUUM IN THE GREEN ARC UNTIL THE SECOND VACUUM PUMP FAILED AND THE GAUGE WENT TO ZERO.

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