SDR 2025FA0000602

Service difficulty report · Servo · Cessna 172S

Difficulty date: August 20, 2025
Submitted: September 1, 2025
Operation: General aviation
Aircraft: N92228
Make and model: Cessna 172S
Aircraft serial: 172S11498
Aircraft time: 6,288 hours
Engine: Lyc IO360L2A
Engine time: 1,431 hours
System (JASC): 2820 · Aircraft Fuel Distribution System
Part: Servo
Part number: 61J26428
Part serial: AV50714195
Condition: Contaminated
Location: Fuel Sys
Part time: 1,431 hours
Stage of operation: CL
How discovered: O
Nature of condition: R, Y, J
Precautionary procedure: A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

MOMENTARY ENGINE ROUGHNESS/VIBRATION. CLIMBING OUT ON THE MISSED APPROACH AT CRQ, ENGINE LOST BETWEEN 200-400RPM AND BEGAN CHUGGING, I CHECKED MIXTURE WHICH WAS FULL RICH, LEANED SLIGHTLY, THE CHUGGING STOPPED. I THEN MOVED THE MIXTURE FULL RICH AND DID NOT ENCOUNTER THE PROBLEM AGAIN. FUEL SERVO REPLACED.

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