You must have the easy settings and ignore crashes and stresses and unlimited speed set in the realism settings as .85 mach is too fast for FL260 (26000') when descending. When you start the decent from FS350, slow to about .78 Mach. If you have auto throttle engaged it would automatically throttle back to just about idle. Keep your eye on the KIAS as well, and if it's approaching 340 knots you will soon be over speeding. At .78M, as you descend, the IAS will increase because of the density altitude change. At FL260 you're definitely over speeding at .85mach. Change the read out to IAS at about FL290 and keep an eye on the IAS. I'm not sure what version FS you're flying, but sometimes when the aircraft starts to descend very slowly, if you just tap the vertical speed selector it will a adjust to the correct that. It seems to hand up at times in some aircraft in some versions.
Originally Posted by sayersb
Controlling Rate of Decent:
Almost immediately ATC tells me to descend and maintain FL140 – this is where it gets interesting. I program 14000 in the ALT window and the aircraft does descend but incredibly slowly, even though -1800 is still showing in the vertical speed indicator. After a few seconds I get the dreaded message from ATC “Please expedite your descent”. Now I’m a bit lost because sure I can increase the rate of descent but of course my speed correspondingly increases – I really want to get the speed down not up!
The 747 is heavy and does want to over speed on decent if you've not real careful about descending. Until you get used to descending in the 747, I'd recommend an IAS of no more than 300 Knots below about FS270.
Speed brakes (spoilers):
When descending you can always slow down by using the speed brakes by pushing the / key. The speed brake control is also located on the throttle control quadrant if you want to see what happens when you push the / key. Also on the outside view, check the topside of the wings. The wing view will make sense when you view it.
In order to maintain <=250 knots under 10,000 feet, you will probably need to use the speed brakes from time to time. By the time you're ready to acquire the localizer, the speed shooed be no more that about 220 knots or even 200 knots. On the kneeboard, check the reference page (bottom button) and check the maximum speeds for the flaps. Also the VREF for landing configuration. As you set up to access the ILS (localizer then glide slope) arm the spoilers by hitting (Shift/). Once you touch down they will automatically deploy.
The end result of all of this is that I arrive either too high or too fast (or both) to intercept the localizer. I must be doing something very fundamentally wrong so hopefully you guys can point me in the right direction. Is it my speed? If so, how should I configure this through the autopilot to control my descent properly? My aim is to fly the takeoff and landing but get the AP to deal with the climb, cruise and descent.
Now that you're at a good speed check the landing speeds for the 747 as well. I'd say at first, land at around at or above 150knot minimum until you get used to it.
I hope this helps, it's a bit long winded.
Last edited by NikeHerk67; 10-14-2008 at 10:29 AM.
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