# SDR 2002FA0000107

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 12, 2001
- Submitted: December 12, 2001
- Operation: General aviation
- Aircraft: [N3264Q](https://openairdocs.org/aircraft/N3264Q), registered now
- Make and model: Cessna 401
- Registry model: [Cessna 401](https://openairdocs.org/model/cessna-401) (OpenAirDocs)
- Aircraft serial: 4010064
- System (JASC): [3710 · Vacuum Distribution System](https://openairdocs.org/jasc/3710)
- Part: Shuttle Valve
- Part number: H67402A3
- Part serial: M1265A8
- Condition: Failed
- Location: Vacuum System
- Part time: 1,577 hours
- Stage of operation: TX
- How discovered: C
- Nature of condition: J
- Precautionary procedure: E, D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2002FA0000107

## Discrepancy

AFTER STARTING THE RT ENGINE & THE LT ENGINE IS OFF. THE RT VACUUM SYSTEM PULLED BOTH LT & RT ORANGE INDICATOR BULLETS ON THE VACUUM GAUGE INDICATING THAT THE LT VACUUM SYSTEM IS WORKING, BUT THE LT ENGINE IS SHUT DOWN. CAUSE: THE LT SHUTTLE/CHECK VALVE FOR THE WING DEICE BOOTS STUCK OPEN ALLOWING THE RT VACUUM PUMP TO SUCK DOWN THE LT SYSTEM THROUGH THE LT VACUUM PUMP GIVING A FALSE OPERATIONAL INDICATION.

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