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Showing results for tags 'autothrottle'.
Found 15 results
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Hi guys. I finally bought myself this wonderful aircraft. Currently, I just want fly a short flight from VHHH to RCTP, a flight last for 1:10. My takeoff weight is around 436000 pounds. Here are 2 questions I encountered: I entered my departure route and runway to the FMC (using runway 07R and OCEAN2A departure). Using flaps 5 and full thrust at 58 C, when I engaged TO/GA, all was going well. I did not hear takeoff configuration warning either. But then at around 100 knots, the autothrottle regarded to idle, triggering the autobrakes and I had to reject the takeoff. I tried a second time and all was fine. I decided to experiment a few times and I noticed this occurred randomly. For me, I was using the mouse wheel for rudder steering. (up for left rudder and down for right) There OCEAN2A departure has a altitude constraint of 5000. I decided to let the autothrottle to do the level off. At this light weight, the climb weight was 4000fpm and the airplane did overshoot for around 200 feet. The speed exceeded 250 knots too. I was what I expected as said in FCTM for low altitude level off at light weight. The FMC commanded a speed of 250 but the airplane accelerated to 280 knots and got stablised at that speed. The autothrottle had no intentions to reduce thrust to slow down. So I took over manually, either moving back on the throttle with FMA still in speed mode or completely disarming the autothrottle. In the second case, I managed to slow down manually. But as soon as I re-engaged the autothrottle, the thrust increased again and airspeed exceeded the commanded speed. Any help is appreciated. Thanks Jethro Chan
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Real pilots usually disengage autopilot and autothrottle during final, touching down manually. A real authothrottle actually moves the thrustlevers so they are in the right position at that moment, and if the plane was on a stable descent in T/D configuration, it will gracefully continue the appoach until touchdown without much interaction except for the flare-out (crosswinds permitting :-)) But PC throttles are not moved by the ATS, and FSX does not read out whichever position the throttles have when the ATS is turned off. Hence the effective (internal) thrust setting is kind of arbitrary at that moment and usually does not correspond to the mechanical lever position even if you try to set it to the suspected "right" position before disengaging the ATS. Especially when the plane feels the throttle is set too low, all kings of envelope protection algorithms kick in, and you really lose control of the plane while it fights your attempts to settle it down anyway. Real flight manuals don't help here of course. How do you handle this? Other than not switching it off? -
Hi, I’m working with:Flight Simulator X, SP2, without FSX Acceleration.PMDG 747-400X version 2.10.0040 I’m having trouble getting the rejected take-off working correctly. The way I understand it is if the plane exceeds 80 Kt and I pull the throttle levers to idle, it should initiate a rejected take-off. It’s not working; pulling the throttles to idle does nothing. I double-checked that under “Add-ons -> PMDG -> General -> Options -> AFDS” I have “Throttle” selected under Controls Override. This matches what is documented in the Type Rating Course (although it appears to be based on FS 2004 so maybe its information is wrong). I also made sure the plane is in thrust hold mode before attempting this. The controller I am using is a Saitek Pro Flight Yoke System with a throttle quadrant add-on. The only way I can seem to get this working is by turning off the Auto Throttle Arm switch. A slightly unrelated question: I’ve mapped a keyboard shortcut to that switch under Add-ons -> PMDG -> General -> Keyboard Commands. It’s still cumbersome to have to reach for the mouse or the keyboard to turn that switch off before I can idle the throttles. How can I assign that to the controller’s button at least? At least I can react quicker and do the two step process if required. I've read various posts about using FSUIPC. I don't have a registered copy of this program but I'm willing to get it if necessary. I'm trying to find out in the mean time if I can program the yoke's button as a macro. I'd still like to be able to just pull the throttles back without having to disconnect the A/T first. I hope this is a known glitch with a fix or I’m doing something wrong myself. I did search the forum. I found posts from other people having the same problem but no fixes were reported. Thanks,Gerard Beekmans
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Hi!Been flying the NGX since it was released now flawlessly. But I have one problem. The autothrottle. I can't get the TO/Go around to work. I've set up the FMC and airplane properly, autothrottle engaged, but when I advance the throttles to 40% for take-off and push the TO/Go around button nothing happens. I've even tried to assign a keyboard button for the TO/GO around mode via the FMC, but it still doesn't work. Any ideas? Am I doing something wrong here?
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Hi! A few questions about how to handle an engine failure during takeoff (after V1). Yesterday I armed a engine failure after V1, manually climbed 1500ft and engaged autopilot but I noticed that I cannot engage autothrottle. Is that normal? Should the autothrottle not be used under any engine failure conditions? How about the landing weight? Would it be normal policy to land the aircraft in an engine failure (not engine fire) occured after takeoff if you are a bit abowe max weight? Say 5000-6000lbs. Or should you circle around to burn fuel with one engine since the 737 has no fuel dump capability? Thanks! Kaj Ekström
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Hello everyone. After my purchase of MIlviz 737-200, everything looked awesome and I was very happy about it. I planned my route and started my engines for the first time, listening to that beautiful sound of the engines and APU shutting down. Because the route was long, about 1.6 Hours, I planned to use LNAV all the way. OK VRef speeds are programmed to MCP by CDU and everything looks perfect. Just to make things clear I used FirstAir version of the aircraft with FMS/Sperry 177 option - which comes with fully functional VNAV, LNAV and Autothrottle. 50% N1 and A/T engage - V1, rotate, V2... Climbing through 3000, I engage A/P and put aircraft in LNAV+Speed mode. I start to turn the speed knob to 240 knots due to restriction in the area. Suddenly A/T goes crazy and puts aircraft in MTOP mode or 100% N1... Aircraft overspeeds and I disengage the A/T. After few minutes of climbing and manually managing the speed, I engage the A/T again. Nothing happens... My speed starts to drop. Then again disengage and engage again. Now it again puts 100% MTOP and so on... I don't know what can cause the problem. FYI I did not put speed in for every waypoint in CDU. Because I wanted to manage the speed by MCP panel with speed mode... If anyone has a solution for this problem please let me know
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hi, my "problem" is not the autothrottle itself. next to the lights test switch, there is some sort of panel with three lights: A/P, A/T and FMC. The A/T is always flashing during approach, but especially when i select a new flap setting. EXAMPLE: i select flaps 1, then reduce my speed to the "number 1" that appears on the speed tape. Please, if i am making any mistake, correct me and i will thank you. thanks in advance tatin 98
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Greetings everyone! The 747-400 is much more complicated than the in-game default 747 that microsoft provides. I am able to control those birds and have them obey the speed restriction while they are under 10000 ft. The PMDG, however, immediately begins accelerating to cruise speed. Both LNAV and VNAV are illuminated and TO/GA is activated shortly after taking flight. In the FMC, I have my speed/trans set at 250/10000 and my speed/rest left blank. Should I input something into speed/rest or does that limit something else? Thanks for any help! --ButtahNBred
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Hi, please apologize this possibly very often asked question ! I'm interested to hear what is the common practice when hand landing the 747-400 as you have to do e.g. at St. Maarten (TNCM) using auto throttle or not. My experience as PC pilot is of course that it can be very convenient because you get rid of some workload. But I want to know when it is recommended to do so or are there some issues maybe because safety is affected to be advised manually control throttle settings. Some information from the reality and common practice if there is one as well is appreciated. Thank you. regards Thomas Burchard -
Hi guys, My T7 is not keeping speed on approach... I running the newest pmdg b777 version on p3d v3.2. I read some posts in regards to this issue, so here the answers: 1. A/T overide NEVER 2. Flare overide YES 3. Weather ASN is good (no turb.0, windshear etc. ) a/t is working with a big delay so the aircraft is very unstable while final approach. Some times it could lead to a stall (vref + 5 knots is set). What to do???
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Hello, So, after I installed a fresh win7 64bit, FSX SP2, REX OD+ Essential, FSUIPC 4.92 and NGX sp1c [all legal for the sceptic...]. It is really that strange problem, so first of all here is a video [with annotations]: http://www.youtube.com/watch?v=6xIQaO0RaPs And now I do the explain (although I wrote it all in the video review): The problem can occur on takeoff (as in the video), or in the middle of the flight (a part of the video). On the ground, after the N1 is on 40%, and I push the TO/GA, the throttle remains on its position although I can't move it (it is on AT arms...), So, I'm disengaging the AT, put the throttle on maximum and return back the AT and TO/GA. After the takeoff, there is the other part of the problem, and this part can occur in the middle of the flight (if the first one didn't): The auto trim and the auto throttle stop to response, the plane start to draft from the magenta line and tilting to the right. as I push the VNAV, the trim "jump" once, and keep on freezing. When I'm trying to make an override to the controls, by moving the yoke, the plane starts to make a right hand roll that I can't control, just if I disengage the AP bar. I managed to find, that if I pause the sim for 5 sec while one of the errors occurs, it fixed it self. Really my friends, I try to reinstall all, to disconnect the yoke and fly with the keyboard ( ), fly without weather, in the day, in the night... but nothing changed. I also found, that the autopilot of the default planes is making some kind of problem, like pulling the trim all the way up (but after I reinstall the FSX it stopes). Here is 2 videos of the old problem: Default C172 autopilot Default 737 autopilot I hope you could understand my problem, and if someone have any idea how can I fix it without reinstall the whole windows again... god will bless him Thank you (Yes, I sent a ticket for the PMDG costumer service... didn't answer me yet, and it is important that other will see it too)
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I can't understand a part of boeing's autothrottle system. Apparently the Asiana pilots couldn't as well, considering the 777 crash was caused by this misunderstanding. The problem lies in the 777's a/t HOLD mode, which is followed by IDLE mode. The 737 has the similar ARM, THR HLD, and RETARD modes. In these modes the servos are disconnected from the engines and the pilot can manually set thrust. Why? What is the purpose of disconnecting the servos? Thank you.
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So there I was ... 134 knots on runway 31R, autothrottle disconnect engaged, thrust levers idle (on my end), and spoilers ground flight engaged but I am not slowing fast enough. Autobrake was enabled minimum but I don't recall any braking occuring. Slowing down; 120, 115 but via friction with the runway only. My eyes glance up to see the end of the runway going by and now I am high speed on the taxiway heading quickly into a jet blast fence at the taxiway turn. My mind flashes back to the approach: Autoflight disengaged and autothrottle giving me trouble. Prior to my predicament the aircraft was on the approach in dual land configuration. Some short time later the aircraft was in flare but the autothrottle had not disengaged and the aircraft simply flew down the runway just a few feet high. It was too late for an attempt to land and stop in time so I disconnected the autoflight and wanted to fly right traffic to perform a visual approach. The throttle was clamped in alpha protection and attempts to disconnect the autothrottle for climb power turned into a struggle between the aircraft and I and never was I confident the throttle is in my control only. Once again, on final approach, hand flying the guidance when my wheels touch, ground spoilers activate, and, even though disconnected, the autothrottle again clamped for alpha protection and would not idle out for application of reverse thrust. I was a heavy aircraft with Vref 185 knots so, needless to say, when the throttle finally obeyed and relinquished, I had gone through the blast fence and was headed for a hangar which I unfortunately perforated at about 125 knots. I can't explain this behavior. I hit, several times, autothrottle disconnect and while rumbling down the runway would glance at it to observe it deviating to near full power then back to idle and them to medium power. During my hand flown pattern around to perform a manual landing, gusty winds and no FSUIPC wind smoothing option set had the airspeed loose 25 knots and I reached alpha whereby the flight computer commanded movement of the throttles and would mot relinquish control even when commanded to. I feel at this point I will have to take control from the aircraft on final approach to avoid this ever happening again. Imanual
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I recently reinstaled my fsx, and NGX also. Since then, on take off - i press TOGA and i move thrust levers(saitek)in max. forward position. I've always done so without any problems. But since last reinstall, manual thrust allways overide autothrust for a very short time - engines goes to maximum thrust, above 100% for a second or two, and than returns to N1 limit. I have controls assigned and calibrated via FSUIPC like allways. In FSUIPC i have cheched "exclude throttle set" and in NGX FMC options i have selected "NEVER" in "A/T Manual Override" section. That should be enough, but maybe i missed something... Any ideas before i reinstall NGX?
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Hello, I've read the intro and the pinned thread, so don't burn me yet (haha). :ph34r: My issue is if I disconnect my joystick at the beginning of cruise (for safety and whatnot, my laptop occasionally moves around during cruise), and then reconnect my joystick on descent, the autothrottle doesn't work, and goes off the position of my throttle slide. I have to cycle the autothrottle arm switches to get it to work again. This only happens during descent, if I connect it prior to decent, no issues. Now someone might go and say just remember to connect prior to descent, but I have an issue where my joystick occasionally disconnects from my computer, probably a cord issue from what I found, and it is annoying. Not sure if anything can be done about that, but I thought I'd share that issue. Also, a cool thing I seen, and one thing that I did not see mentioned, is that you cannot retract the leading edge slats at cruise. I am going to assume that this is realistic to the plane, but they won't retract until you get back down to below 10000ft. So just thought I'd share those two things, and maybe there is something that can be done about the first issue I've encountered. -Tom H
