Propeller Problems

The following is derived from maintenance facility submissions to the FAA’s Service Difficulty Reports database.

Aviation Safety

Monday, March 03, 2025 at 05:00 AM ET

Verified

Key Takeaways:

Propeller system components such as hub pistons and governors are prone to wear and mechanical failure, leading to issues like oil leaks, engine overspeed, and an inability to feather.
Structural integrity problems, including cracks in propeller hubs or blade/tip separation, can occur due to fatigue or damage, causing severe vibrations and requiring emergency landings.
These incidents across various Cessna and Piper aircraft models underscore critical safety concerns related to propeller systems, often resulting in engine damage or emergency procedures.

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Cessna R182 Skylane RG

Worn Hub Piston

Propeller was leaking oil, so it was removed and sent it off to be resealed. Prop shop discovered the piston had worn out of spec. Scoring was found on the inside of the piston where it rides on the guide. Wear marks were 180 degrees apart on the front and back. The piston was cocked while moving on the guide rod. Part replaced and prop was resealed.