# SDR 2026FA0000137

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 9, 2026
- Submitted: February 20, 2026
- Operation: General aviation
- Aircraft: [N952JA](https://openairdocs.org/aircraft/N952JA), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S10474
- Aircraft time: 12,428 hours
- System (JASC): [3710 · Vacuum Distribution System](https://openairdocs.org/jasc/3710)
- Part: Pump
- Part number: RAP215CC
- Part serial: A77186
- Condition: Inoperative
- Part time: 2,200 hours
- Stage of operation: CL
- How discovered: O
- Nature of condition: R
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2026FA0000137

## Discrepancy

DURING CLIMB THE PILOT NOTICED ENGINE RPM FLUCTUATIONS. AIRCRAFT RETURNED BACK TO THE AIRPORT, DID ENGINE RUN UPS AND NOTICED VACUUM PUMP WAS INOPERATIVE. MAINTENANCE REMOVED FAILED PUMP AND FOUND DRIVE SPLINE SHEARED AND PUMP SEIZED.

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