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philwebb

Final descent and ILS aquisition stage of a flight...

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Hi thereCargo Tinmouse has quickly become a favourite a/c and I am loving it! ThanksHowever I have problems in the fianl phases of my descent and localiser/ILS capture with pitch and altitude and descent control. The ALT Hold on the autopilot seems to be rather inaccurate at low levels / speeds - say 6000 - 3500 feet, and when using it the plane will often go through a required altitude by a wide margin and then try to climb and recapture leading to speed fluctuations and a generally sloppy conrtol and porpoising!!!! =:(Now I wonder what the correct proceedure here is? Any advice from the real world gratefully received!It occurs to me that maybe I should be more manual in this phase and try to trim or use CWS to capture so that the descent rate is small before hitting ALT HOLD, or even to not hit it and to trim manually to maintain an altitude? CWS seems to become a little vague in this phase too?Help!In all other aspects I have few problems with control. Other than that it is all in there and a joy to fly!!!TIAPhil Webb

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Phil; The Alt Hold should not be used to perform a level off...that needs to be done manually with the CWS. My personal technique is not to have more than ~200 fpm on the VVI when I engage the alt hold.RegardsBob ScottATP IMEL Gulfstream II-III-IV-VSantiago de Chile

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Hi BobThanks for the reply - I will alter my technique and try it tonight on a flight planned from Milan to Frankfurt!I have to say I keep discovering new things - like the DME switches on the Nav radios, nice. Not being a real world pilot though, I don't know why you might want to switch the DME off??One more question - there are some thumbwheel controlled number (windows) seperate to the Transpopnder itself, on the bottom right of the panel with the weather radar and computer on, what are they for?Loving this Tinmouse!Phil

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It's called a memory aid...basically just a way to store a memory-jogger for something like a callsign (flight number for example).CheersBob ScottATP IMEL Gulfstream II-III-IV-VSantiago de Chile

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Thanks BobDidn't get to brush up on my descent technique tonight after all...tomorrow maybe!Phil

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