A Chieftain operator in Qld has brought in a requirement to check the magnetos at top of descent for dead cut at cruise power of 31MAP. While the mag switch is not switched off, the operator simply selects left then right magneto position to see if the engines runs OK.
I would suggest they won't run OK if the pilot
"...selects left then right magneto position..."
Why, oh why, do operators and pilots think they are enhancing safety by introducing procedures which are not approved by the manufacturer???????? Do you think these manufacturers don't know their own product?
Centaurus, you answered your own question:
"The manufacturer recommends a "cool-down" time of three minutes at idle power after high power to aid cooling of the turbo-charger." Why are you seeking to implement or obtain opinions on procedures which may be contrary to the manufacturer's recommendation?
Perhaps I should change the title of this thread to "What non standard procedures can we introduce"?
Woomera