Hi therer!First of all I would like to thank you all for a really nice bird :)So my question: When I reach my cruising altitude the speed of the aircraft have problems with stabilizing and the speed continue going up and down...This happens both when I have VNAV or SPD selected on the AP...It`s very irritating for my ears who have to listen to the up and down sound from the engines ;)So if you can tell me what I perhaps does wrong then please shout out :)PS. Sorry for my bad English language...

In the real bird the engines with winds etc will never be completly *set* and smooth. It's just the AP trying to keep the set speed etc. Check if you have any winds going on. Please note *turbulence* section below.http://forums.avsim.com/user_files/20734.jpg[h5]Best Wishes,Randy J. Smith[/h5][h6]The Next Great one? PMDG's 737NG is here![/h6][h3]" A little learning is a dangerous thing"[/h3] [h5]AMD XP 2200 |MUNCHKIN 512 DDR RAM |ECS[/b ][i] K7S5A MB[/i] |GF3 64 MEG @ 215/545|WIN XP PRO |MITSUBISHI DIAMOND PLUS 91 19"[/h5]

Yes, I have winds(flow online on VATSIM)Maybe I shall try to control the speed manually when in cruise?

Happens to me aswell. The A/T is chasing the target speed and the tolerance seems to be very small...too small.This definetely doesn't happen in the real plane, once in cruise, the A/T's sensitivity decreases. Sometimes even manual input is required (during turbulence) to prevent the aircraft from overspeeding as the A/T would be too slow to reduce thrust.Regards,Mark

Well sure you are the captain! I *bet* you will see a change, like I said, that's the way the AP is supposed to work, great attention to realism huh? Happy flying.[h5]Best Wishes,Randy J. Smith[/h5][h6]The Next Great one? PMDG's 737NG is here![/h6][h3]" A little learning is a dangerous thing"[/h3] [h5]AMD XP 2200 |MUNCHKIN 512 DDR RAM |ECS[/b ][i] K7S5A MB[/i] |GF3 64 MEG @ 215/545|WIN XP PRO |MITSUBISHI DIAMOND PLUS 91 19"[/h5]

Ok, if this is the only solution I will do so...But it seems to me a little strange, anyway... Thanx for the help, and again this bird is lovely :)

I doubt that IRL the A/C is pitching up and down, and throttle levers are moving back and forth all the time, and to this degree.. Sure, the A/C will never be rock steady, but with a steady tailwind of 30kts, it won't be oscilating like this.. I have even had this oscilating thing when mye weather generator was disabled, and no winds!

This is really bothering me too. I understand that the throttles will adjust due to wind/turbulence, but its not like adjusting, its going up and down all the time.. (around 7% N1 difference) approximatley 5 seconds each way (increase/decrease) before it goes back.This can't be right?Fredrik

I tried a long flight after this talk with ActiveSky 1.85 and could not reproduce what you guys are seeing on my machine and had pretty good wind blowing. Fredrik, does this happen to you also with no winds?[h5]Best Wishes,Randy J. Smith[/h5][h6]The Next Great one? PMDG's 737NG is here![/h6][h3]" A little learning is a dangerous thing"[/h3] [h5]AMD XP 2200 |MUNCHKIN 512 DDR RAM |ECS[/b ][i] K7S5A MB[/i] |GF3 64 MEG @ 215/545|WIN XP PRO |MITSUBISHI DIAMOND PLUS 91 19"[/h5]

hi there, try to uncheck the " ALLOW GUST IN UPPER WINDS' in the winds section of FSPUICCmight help you.HENRY CYXT

Hi!I Will try that Henry!I also tried now to switch off the AT, but still the problem was there!When I increased the throttles they did was I commanded, but when the speed was approaching about 280 IAS(FL350) the throttles automaticly decreased itself(yes, the AT was off)What`s going on?

Captain,280 KIAS at FL350 is about mach 0.832...Ahem... this is beyond Mmo (not barber pole). (a) What probably happened was that the N1 required to maintain this speed was greater than the FMC calculated N1 limit. The modelled FADEC (Full Digital Authority Electronic Control) kicked in and prevented throttles from advancing further. This is a protection system that will work regardless of the AT arm switch or AT speed mode. It just makes sure that the airline company wont miss an engine...and you Captain will not practice an engine inop drift down drill !(:( Given the above speed estimates you were probably in the "yellow" zone of the PFD speed tape. If the atmosphere was somewhat unstable too, you experienced some modest "high speed buffeting" which IS modelled (within the constraints of FS).© The speed and alt tolerance is very very small. In fact a real round number. Cant get more round than that. ZERO ! Some more info : In heavy turbulence the AT system will favour positive deviations ! Actually FS "light" turbulence is moderate to severe is real world. Wonder whether MS asked anybody who knew what turbulence is. FSUIPC has settings for gusts, wind, pressure and temperature variation delay. Found beneficial and realistic to use pretty conservative values.(d) If anyone comes across that behaviour in normal speed, please report this and please, please, please include weight, KIAS/Mach, flight level, wind and TAT or OAT values. If found to be a persistent problem ofcourse we will take care of that.Regards,Vangelis====================================== E. M. Vaos Precision Manuals Development Group www.prescisionmanuals.com======================================