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Old June 30th 03, 11:45 PM
David Megginson
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"Mike Schumann" writes:

potentially saving on maitnenance because pilots are not
over-leaning or shock cooling the engines, could make a BIG
difference in the operating costs of the planes.


You might have that backwards: students (and renters) tend to run
overrich, not overlean, at least from what I've heard. It's the
overrich operation that does the damage (fouled plugs, stuck valves,
etc.).

Does anyone have an actual report of an engine being damaged by
overlean operation? It would be interesting to read. The only danger
I can think of would be running lean far above 75% power and causing
detonation, though vibration from an extremely rough-running engine
could also do something nasty.


All the best,


David

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David Megginson, , http://www.megginson.com/