Results 1 to 4 of 4
  1. #1
    Charalampos Perivolas
    Guest

    Boeing VNAV Behaviour and FP import

    1. If we have a flight plan from one airport to the other , without an
    intermediate point, then there is a strange behaviour in VNAV calculation from
    the program.
    The plane after take off , with LNAV VNAV mode engaged keeps the speed that
    is calculated for the FAF of the destination airport (190 Knots)regardless
    of our Final FL and the calculated speed in our CRZ CDU Page (340/.790)
    IMHO the correct behaviour should be to accelerate to 250 Knots under FL100
    and after passing that FL, to continue accelerating to our Climb speed
    programmed in our CLB CDU page.
    2. If we aproach an Airport at Final FL and we pass the final waypoint before
    FAF, then when the TOD is reached the plane slows down to the calculated
    speed for that FAF point (190 Knots), regardless of the FL that is flying,
    and the calculated speed in the DES CDU page.
    IMHO it should start the descent with the calculated speed through DES CDU
    page managing the speed automaticaly all the way down up to that FAF point.
    3. If we import a FS2k4 Flight plan in the CDU (pressing two times RTE and
    5RSK), then the two first letters of every waypoint are missing (ATV is
    showing as V , BADEL is showing as DEL, and if it is a two letter NDB it is not
    shown at all, only a blank line).
    I do not use this feature since I want to manualy enter my routes every time,
    but since I saw it I thought it is good for you to know it for an
    upcomming fix.

    Blue Skies!

    Babis



  2. #2
    Enrico Schiratti
    Guest

    Re: Boeing VNAV Behaviour and FP import

    Blue skies to you too, and I think I know what that is
    caused by... will check it out.

    How far apart are those airports?

    Ciao

    Enrico

    "Charalampos Perivolas" wrote in message
    news:381836.76659@wb.onvix.com...
    > 1. If we have a flight plan from one airport to the other
    > , without an
    > intermediate point, then there is a strange behaviour in
    > VNAV calculation from
    > the program.
    > The plane after take off , with LNAV VNAV mode engaged
    > keeps the speed that
    > is calculated for the FAF of the destination airport (190
    > Knots)regardless
    > of our Final FL and the calculated speed in our CRZ CDU
    > Page (340/.790)
    > IMHO the correct behaviour should be to accelerate to 250
    > Knots under FL100
    > and after passing that FL, to continue accelerating to our
    > Climb speed
    > programmed in our CLB CDU page.
    > 2. If we aproach an Airport at Final FL and we pass the
    > final waypoint before
    > FAF, then when the TOD is reached the plane slows down to
    > the calculated
    > speed for that FAF point (190 Knots), regardless of the FL
    > that is flying,
    > and the calculated speed in the DES CDU page.
    > IMHO it should start the descent with the calculated speed
    > through DES CDU
    > page managing the speed automaticaly all the way down up
    > to that FAF point.
    > 3. If we import a FS2k4 Flight plan in the CDU (pressing
    > two times RTE and
    > 5RSK), then the two first letters of every waypoint are
    > missing (ATV is
    > showing as V , BADEL is showing as DEL, and if it is a two
    > letter NDB it is not
    > shown at all, only a blank line).
    > I do not use this feature since I want to manualy enter my
    > routes every time,
    > but since I saw it I thought it is good for you to know it
    > for an
    > upcomming fix.
    >
    > Blue Skies!
    >
    > Babis
    >
    >



  3. #3
    Charalampos Perivolas
    Guest

    Re: Boeing VNAV Behaviour and FP import

    Hi,

    The distance was 210nm, but I checked it also with a distance af 100nm and
    there is the same prob.

    Blue Skies

    Babis



  4. #4
    Tom Stian Bjerk
    Guest

    Re: Boeing VNAV Behaviour and FP import

    To the question #1.
    I also have the same problem. There is someting strange there.. Its not
    acting the same way as with the CDU from 737NG-PMDG..

    I tough mabye I did some wrong with the programing of the CDU.

    Best Regards
    Tom Stian Bjerk


    "Charalampos Perivolas" wrote in message
    news:381836.76659@wb.onvix.com...
    > 1. If we have a flight plan from one airport to the other , without an
    > intermediate point, then there is a strange behaviour in VNAV calculation


    > from
    > the program.
    > The plane after take off , with LNAV VNAV mode engaged keeps the speed
    > that
    > is calculated for the FAF of the destination airport (190

    Knots)regardless
    > of our Final FL and the calculated speed in our CRZ CDU Page (340/.790)
    > IMHO the correct behaviour should be to accelerate to 250 Knots under
    > FL100
    > and after passing that FL, to continue accelerating to our Climb speed
    > programmed in our CLB CDU page.
    > 2. If we aproach an Airport at Final FL and we pass the final waypoint
    > before
    > FAF, then when the TOD is reached the plane slows down to the calculated
    > speed for that FAF point (190 Knots), regardless of the FL that is

    flying,
    > and the calculated speed in the DES CDU page.
    > IMHO it should start the descent with the calculated speed through DES

    CDU
    > page managing the speed automaticaly all the way down up to that FAF
    > point.
    > 3. If we import a FS2k4 Flight plan in the CDU (pressing two times RTE

    and
    > 5RSK), then the two first letters of every waypoint are missing (ATV is
    > showing as V , BADEL is showing as DEL, and if it is a two letter NDB it
    > is not
    > shown at all, only a blank line).
    > I do not use this feature since I want to manualy enter my routes every
    > time,
    > but since I saw it I thought it is good for you to know it for an
    > upcomming fix.
    >
    > Blue Skies!
    >
    > Babis
    >
    >



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