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The detail in these checks has to be seen to be believed, right down to borescope inspections of wheel bearings.

At a minimum, you’ll need a drill; diamond and tungsten carbide drill bits, capable of boring into reinforced metals; an optical device called a borescope; and a stethoscope.

If that doesn’t work, drill a hole next to the lock, and insert your borescope to line up the notches by sight.

The best way to determine that would be to snake a borescope — a device that has a tube with a lens that’s linked to a camera — into an opening in a column base.

As workers were snaking a flexible borescope camera through inaccessible areas of the plane, they spotted a pair of pliers underneath the instrument panel.