Jump to content

Recommended Posts

Posted

Hey all,Fully enjoying the MD-11 and I completed my first trans-atlantic flight yesterday as well. My observation over the past several flights using a full Profile-descent directly to a coupled ILS autoland is that once I'm at or below the 240kt initial approach speed, the FMS assigned speeds don't seem to change unless I drop the slats and flaps first, then the speed-bug reacts appropriatly. Where as on the Boeings, it always seemed like the speed-bug would drop ahead of time and I as the pilot would apply the appropriate flaps on schedule.So, is this a normal difference between the MD and the Boeings where it seems the current MD approach flaps drive the current FMS speed? Or, I am doing something inappropriate?Also, the other thing I noticed yesterday was that when I was well above the FAF for the chosen ILS, the G/S still coupled at the same time as the LOC and it started a forcefull descent (~ 4Kft/min), quite drasticaly, down to put the G/S center-scale. My point here is, I was always under the impression that if you came in high on the ILS, the G/S would not couple because of the unsafe nature of a drastic descent at such a low altitude. Is this a possible bug or does the real MD-11 allow above G/S captures?Regards,

Regards,
Al Jordan | KCAE

  • Commercial Member
Posted

Regarding automatic deceleration :http://ops.precisionmanuals.com/wiki/PMDG_...during_approachThe quoted distances are ofcourse the sane latest moment at which you extend slats/flaps.PROF will not reduce speed until the point calculated where decel to next target is required or slats/flaps are extended.Boeings do NOT do automatic deceleration. You see the speed bug dropping because you defined (manually) a speed srestriction somewhere and VNAV allows lower and lower targets (until equal to the entered speed restriction) as flaps are extended.Regarding GS capture : this is a plane feature.===================================== E M V Precision Manuals Development Group www.precisionmanuals.com=====================================

====================================

E M V

Precision Manuals Development Group

====================================

Guest Totalbeginner
Posted

>Also, the other thing I noticed yesterday was that when I was>well above the FAF for the chosen ILS, the G/S still coupled>at the same time as the LOC and it started a forcefull descent>(~ 4Kft/min), quite drasticaly, down to put the G/S>center-scale. My point here is, I was always under the>impression that if you came in high on the ILS, the G/S would>not couple because of the unsafe nature of a drastic descent>at such a low altitude. Is this a possible bug or does the>real MD-11 allow above G/S captures?>>Regards,The same thing happens in the 744 and it's a real pain. It makes it impossible to do a constand descent approach because as soon as the LOC is captured, the aircraft dives like a suicidal maniac!Martin

Posted

> Dives like a suicidal maniac!Which is why it is usual on most ILS Charts for the aircraft to approach below the G/S and pick it up by flying into it.It's a rare occasion that ATC will vector you to an ILS from above the glideslope. On the few occasions that it has happened to me, it's generally only been a hundred feet above, usually less, but i agree, it doesn't half go for it when you are high! ;)CheersPaul

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Tom Allensworth,
    Founder of AVSIM Online


  • Flight Simulation's Premier Resource!

    AVSIM is a free service to the flight simulation community. AVSIM is staffed completely by volunteers and all funds donated to AVSIM go directly back to supporting the community. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. Thank you for your support!

    Click here for more information and to see all donations year to date.
×
×
  • Create New...