# SDR HYIA20260731002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 13, 2026
- Submitted: August 1, 2026
- Operation: Air carrier
- Aircraft: [N2649Z](https://openairdocs.org/aircraft/N2649Z), registered now
- Make and model: Cessna 402C
- Registry model: [Cessna 402C](https://openairdocs.org/model/cessna-402c) (OpenAirDocs)
- Aircraft serial: 402C0333
- Aircraft time: 30,492 hours, 26,447 cycles
- System (JASC): [2822 · Fuel Boost Pump](https://openairdocs.org/jasc/2822)
- Part: Pump
- Part number: 2B7290H
- Part serial: 4J321
- Condition: Obstructed
- Location: Zone 500 Fuel
- Part time: 3,728 hours, 4,602 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: R, F, J
- Precautionary procedure: E, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HYIA20260731002

## Discrepancy

CREW REPORTED LEFT HAND ENGINE VIBRATION AND SLIGHT SURGING, ALL ENGINE INDICATIONS REPORTED NORMAL. CREW PERFORMED MAG CHECK (NORMAL) AND TURNED THE LEFT AUXILIARY PUMP OFF, THEN TO HIGH AND STILL HAD THE VIBRATION, SLIGHT SURGING AND DROPPING RPM. CREW DECIDED TO FEATHER THE ENGINE AND SHUT IT DOWN. COMPANY MAINTENANCE INSPECTED AND FOUND THE INTERNAL CHECK VALVE ON THE LEFT SIDE AUXILIARY PUMP WAS STUCK. THIS PUMP WAS REMOVED AND REPLACED WITH AN OVERHAULED UNIT. ALL FUNCTIONAL CHECKS NORMAL AFTER REPLACEMENT.

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