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Post by tikic1 on Nov 28, 2015 7:17:18 GMT -5
hi, during cruise descent in a propliner you would have to reduce MAP 3 inches per minute but is it also important to do that in approach phase descent at lower IAS and approach configuration or any time i want to reduce power in normal flight? Second question is it also required in approach phase of flight not to reduce MAP below minimum recommended for cruise descent?
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Post by Tom/CalClassic on Nov 28, 2015 11:25:37 GMT -5
Hi,
I'm not at my computer right now, but in general the answers are yes. You can shock cool the engines during any phase of flight. Typically you should be around 30" MAP or less after completing your initial descent if you will be starting your approach immediately. If not, you reduce your MAP 3" per minute when getting ready to start your approach.
However once you are in the pattern there is no requirement to make gradual power changes, although it is still good technique to minimize shock cooling whenever possible. Safe handling of the approach is paramount, though.
There should be a minimum MAP value given somewhere in the handling notes. The lowest of these should not be broken until you are making the final flare at landing.
Hope this helps,
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Post by Defender on Nov 28, 2015 18:25:14 GMT -5
I've always interpreted that advice as meaning reduce MAP by not more than 3 inches per minute. Makes a lot more sense that way. You may or may not actually need any reduction or not as much, depending on the circumstances.
Bill
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Post by Tom/CalClassic on Nov 28, 2015 20:58:39 GMT -5
Yes, that is a maximum rate.
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Post by thomas on Dec 1, 2015 16:08:45 GMT -5
if you need to reduce power by more than 3" per minute you could of course cheat by leaning the engines so much that they don't make any power... but it is cheating and shock cooling will still occur.
regards
Thomas
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