Ok, I detect some hostility here. I was trained at Rogers Aviation at Cranfield by CFI Ron Campbell and Bob Walker, so I have had good training. Sadly both are no longer with us.
The rapid cooling down of an engine, this includes those filtted with turbo’s or super chargers, can produce localised hotspots when there is reduced cooling, during slow flight as an example. This situation occurs when the contaminants in the engine lubrication oil become deposited on the valve stems, eventually restricting the valve movement, and resulting in intermittent engine hesitation or miss. This is known as “Coking”. It blocks up the passageways, preventing oil to flow to the bearings. Exposing the engine to sudden cool down, as in a rapid descent with the power reduced, or shutting the engine down before it has sufficiently cooled down can also induce valve sticking over a period of time.
Also It would be nice to see people do Mag checks prior to shutting down an engine. I didn’t see that carried out here. With regards to the downwind checks I carry these out, including the harness and hatches procedure, but also on final’s. I go through that part again as some passengers in the back can’t hear sometimes. i get concerned when I see procedures not being followed, they were written for a reason.
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