What was found
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.
- Difficulty date
- January 9, 2026
- Submitted
- February 20, 2026
- Operation
- General aviation
- Aircraft
- N952JA
- Make and model
- Cessna 172S
- Aircraft serial
- 172S10474
- Aircraft time
- 12,428 hours
- System (JASC)
- 3710 · Vacuum Distribution System
- 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
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.