Register

Breaking Down Sudden Stoppage Inspections

Here’s what to do when a propeller strike occurs.

One horrible sound that is legendary among aviators is the unmistakable thwack of a propeller striking something substantial. [Courtesy: Richard Scarbrough]
Gemini Sparkle

Key Takeaways:

  • Propeller strikes on air-cooled reciprocating engines, broadly defined by OEMs like Lycoming and Continental, necessitate immediate and comprehensive inspection due to the high risk of hidden internal damage (e.g., cracked crankshafts, crankcases) that could lead to catastrophic engine failure.
  • Manufacturer service bulletins and service letters mandate specific actions, often including full engine teardowns, and the replacement or overhaul of other critical components like vacuum pumps, magnetos, and roller tappets, regardless of visible propeller damage.
  • Given the varying interpretations of regulations and the severe safety risks, pilots and mechanics are strongly advised to consult specialists and strictly adhere to OEM guidelines rather than attempting minimum compliance after a prop strike incident.
See a mistake? Contact us.

There comes a time in most every pilot’s career when they think to themselves, “That doesn’t sound good!” Some sounds are worse than others, and more than a few are absolutely dreadful. One such sound is legendary among aviators. That is the unmistakable thwack of your propeller striking something substantial. Once heard, you enter the world of the sudden stoppage inspection. Buckle up because it will get worse before it gets better.

As many of you know, I owned and operated an aircraft engine shop for more than a decade and consistently handled sudden stoppage inspection cases. The jobs were so common that we even had T-shirts printed with the phrase, “Things get hot when the big fan stops.” Sometimes, humor can help take some of the sting away. Like the late Jimmy Buffet sang, “…if we couldn’t laugh, we would all go insane.” Aircraft ownership and maintenance will do that to you. This is why we all gather here to swap stories, support each other, and maybe learn a little something along the way.

Richard Scarbrough

Richard is a US Navy Veteran, A&P Mechanic, and Embry-Riddle Aeronautical University alumni. His experience ranges from general and corporate aviation to helicopters, business jets, and commercial airliners. Former owner of a 145 repair station, he currently has an aerospace product management role and is a member of the T-C-Alliance. Follow him on X (Twitter) at @RScarCo.

Ready to Sell Your Aircraft?

List your airplane on AircraftForSale.com and reach qualified buyers.

List Your Aircraft
AircraftForSale Logo | FLYING Logo
Pilot in aircraft
Sign-up for newsletters & special offers!

Get the latest stories & special offers delivered directly to your inbox.

SUBSCRIBE