Let'sgoflying!
Touchdown! Greaser!
Everyone uses their borescope to look into the spark plug holes. I never hear of other airplane orifices being explored. Maybe we are being too unimaginative and could see neat stuff....in the oil filler port, or in the sump after the oil is out, where else?? Can any cam lobes be seen? , connecting rods, edges of bearings, piston pins? Just wondering what can be seen, what cannot. Maybe airframe structures?