ZQA297/30,
I think we are aiming for the same target, but from different angles.
In terms of scheduled borescope inspection, thats up to the operator, on how they want to monitor the condition of their engines. As I am sure you are aware an engine in the shop is not only costly in terms of maintenance but also in terms of down time, unless of course you have a spare engine you can spin on wing in the interim, then of course if you have multiples then what about spare engine quantities and that is a lot of money to tie up and of course your spare engine is calendaring out while its on a stand, unless it is subject to a an approved storage program.
The upshot is that, as I am sure you are aware, an operator wants to preserve its engines.
An operator i used to work for, it was a sackable offence to go over 95% The types we operated would get off at 92% MTOW, hot and high at our shortest runway limits. Anything above that was toasting the engines and burning dollar bills.
Volcanic ash was not among the contaminants we used to to deal with. What are the procedures?
What are the concentration levels ?
Like I said, we seem to be on the same target but from different angles.