# SDR 2021FA0000059

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 24, 2021
- Submitted: February 24, 2021
- Operation: General aviation
- Aircraft: [N280SU](https://openairdocs.org/aircraft/N280SU), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S12432
- Aircraft time: 548 hours
- System (JASC): [3710 · Vacuum Distribution System](https://openairdocs.org/jasc/3710)
- Part: Regulator Valve
- Condition: Defective
- Location: Vacuum Sys
- Part time: 548 hours
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2021FA0000059

## Discrepancy

THE VACUUM REGULATOR VALVE WAS COMPLETELY INOPERABLE.  VACUUM SYSTEM INDICATION WAS DIRECTLY PROPORTIONAL TO THE ENGINE RMP.  REMOVED VACUUM REGULATOR VALVE PN: AA2H3-2, SN 2-27216 AND INSTALLED NEW PN: AA2H3-2, SN: 2-0HJH04 (8130-3) IAW CESSNA/TEXTRON 172 SERIES (1996 & ON) AMM REV. 23 CHAP. 37-10-00.

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