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Ageing Process of New TB from a borescopic POW

Dan 57

Dan 57

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Yep, the whole thing is a bit academic... but our country's aviation authority, part of their great wisdom (but above all, power), requires an additional maintenance program on our props and engines in order to keep running past manufacturer's overhaul recommendations, TBOs.
Part of that program is a borescope inspection every 100h engine flight time (luckily, all limits here are based on flight times only).

Now I'm lucky enough to have been able to acquire a brand new TB Lycoming YO-360-EXP314 from Vans (previous motor wasn't Vans OEM), and the picture poster below shows the interesting (and normal up to now) ageing process.
History is as follows:
  • the row to the far right was taken as the engine was delivered, just prior to first start after install on June 30th 2025 (had been run for some 30' by the manufacturer)
  • the middle row after 100 hours on 21st August 2025
  • and the far left row after 200 hours 7th January 2026
Side note, the engine was first run on 100LL Avgas, and starting 100 hours on Mogas 98 exclusively, including some automotive valve protection additive.

TB bore.png
 
Wow, quite the transformation. Great pictures; may I ask what borescope you're using for those images?
 
Dan 57 said:
Yep, the whole thing is a bit academic... but our country's aviation authority, part of their great wisdom (but above all, power), requires an additional maintenance program on our props and engines in order to keep running past manufacturer's overhaul recommendations, TBOs.
Part of that program is a borescope inspection every 100h engine flight time (luckily, all limits here are based on flight times only).

Now I'm lucky enough to have been able to acquire a brand new TB Lycoming YO-360-EXP314 from Vans (previous motor wasn't Vans OEM), and the picture poster below shows the interesting (and normal up to now) ageing process.
History is as follows:
  • the row to the far right was taken as the engine was delivered, just prior to first start after install on June 30th 2025 (had been run for some 30' by the manufacturer)
  • the middle row after 100 hours on 21st August 2025
  • and the far left row after 200 hours 7th January 2026
Side note, the engine was first run on 100LL Avgas, and starting 100 hours on Mogas 98 exclusively, including some automotive valve protection additive.

View attachment 106836
Click to expand...
200 hours in six months !!
 
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