SDR N3XR202012090001

Service difficulty report · Valve · Cessna 172S

Difficulty date: December 3, 2020
Submitted: December 9, 2020
Operation: General aviation
Aircraft: N417ER
Make and model: Cessna 172S
Aircraft serial: 172S11445
Aircraft time: 5,948 hours
Engine: Lyc IO360L2A
Engine time: 4,271 hours
System (JASC): 8530 · Reciprocating Engine Cylinder Section
Part: Valve
Condition: Stuck
Location: Nr 4 Cylinder
Part time: 2,269 hours
Stage of operation: CR
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.

What was found

DURING FLIGHT, THE CREW EXPERIENCED A SIGNIFICANT VIBRATION. THEY LANDED AT THE NEAREST AIRPORT. EXAMINATION REVEALED THAT THE NR 4 CYLINDER HAD A STUCK VALVE, RESULTING IN A BENT PUSHROD. THE CYLINDER AND PUSHRODS WERE REPLACED WITH A REPAIRED/NEW UNITS.

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