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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, broadly defined by engine manufacturers, mandate immediate and thorough "sudden stoppage inspections" due to the high risk of hidden, internal engine damage.
  • These incidents, which can occur from various causes including human error, ground contact, or wildlife strikes, frequently result in unseen critical damage to components like crankshafts, governors, and engine accessories.
  • Manufacturers' service bulletins and industry experts strongly advocate for comprehensive engine teardowns and inspections after a prop strike to prevent potential catastrophic engine failure from hidden damage.
  • Beyond addressing prop strike damage, a thorough inspection provides an opportunity to identify and rectify other pre-existing engine issues, enhancing overall aircraft safety.
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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.

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