Modelling engine wear and WEP limitations

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strip inspections were not required after its use:

It means the engine was not required to be stripped apart and internal tolerances checked. That is done at overhaul.

The engine must be inspected according the document you just posted.

It clearly states the engineer must asses the reduction in life of the motor from using emergency boost.

That means done by performing an oil analysis, oil change, compression check, and overall inspection of the condition of the motor.

They might check the crank play as well. All of that only takes a few hours to perform and will tell a mechanic the health of the engine and it requires a reduction in life.

For example, if the compression check ends up with a cylinder not making the correct compression values or the composition/type of the metal in the oil will tell a mechanic if the engine life is nearing its end.