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Landing Gear - Throttle Problem

Featured Replies

  • Author

Yeah I've worked that out. Thanks, and yes I was to blind to see the REV text on the EICAS, oopsies! Thanks for your help, I'm gonna check it out now to see if the re-install did anything. Fingers crossed ... :)

Ben

The EEC comands an higher idle when the gear deploys of to reasons: 1. To encounter for a part of the drag added by the gear.
Are you sure about that?
You can badly see the N1 increase after landing gears are selected down at minute 2.04, it is just a second of video or 2, then, you will see engine indications back only after landing.
The engines were spooled up before to ~45% and then they went back down to 30% when the CA selected the new flap maneuvering speed.I really don't think RW, there is a bump in N1 when you drop the gear.

Edited by Spin737

Matt Cee

I'm pretty sure about it, I'll post what manual says when I can re-use my home pc.

Regards

Andrea Daviero

I head down to KSEA and KOAK tonight. I'll try to watch for it. I'm guessing it's PSEU driven?

Matt Cee

  • Commercial Member

What "idle bug" is being referred to here? I'm not aware of any such thing.If you can't slow down on approach with the gear down and landing flaps out, the problem is likely one of the following:1. Your glidepath is too steep (above 3 degrees)2. You're above max landing weight.3. Your joystick/throttle axis is miscalibrated and is adding thrust that shouldn't be there.The assertions by several people here about the real NG not adding thrust like this are wrong - it most definitely does it and it is described in the manuals. (page 7.20.7 (361 of the PDF) in the FCOM2 - the full technical explanation for how it works is in the maintenance and engineering manuals we have from Boeing that are not included with the product) The criteria for it is flaps 15 or higher set or engine anti-ice on at any flap setting and it stays that way until touchdown - you do NOT chop the throttles in the flare in a modern jet, you land with power on. Please read the landing section of the FTCM.No FS addon has modeled this feature to date and that's likely why you've never seen it before.

Ryan Maziarz
devteam.jpg

For fastest support, please submit a ticket at http://support.precisionmanuals.com

Ok sorry to take up your time, thank you very much, I am trying a re-install now and am hoping that will solve the problem. I am starting to wonder if I even have a problem after watching the following video.

http://www.youtube.com/watch?v=bK_gOrNBALs

The throttle was at about 40 % N1 on touch-down!
Looking at this video, my landings aren't that bad at all: I always feel a bit own because of (over) correction all the time but I guess It's all about steering until you get it down??Bert Van BulckP.S.: coming from the PMDG 737 legacy (FS9) I too had the feeling the NGX was floating. But -again- looking at this vid, it's actually pretty accurate!
you do NOT chop the throttles in the flare in a modern jet, you land with power on. Please read the landing section of the FTCM.
. :(
After the flare is initiated, smoothly retard the thrust levers to idle, and make smallpitch attitude adjustments to maintain the desired descent rate to the runway.Ideally, main gear touchdown should occur simultaneously with thrust leversreaching idle.

Matt Cee

Are you sure about that?The engines were spooled up before to ~45% and then they went back down to 30% when the CA selected the new flap maneuvering speed.I really don't think RW, there is a bump in N1 when you drop the gear.
Approach idle comes on when:(from manual)
  • Cowl thermal anti-ice switch is in the on position for engine 1 or engine 2
  • Below 15,500 feet and the left or right main gear is down and locked
  • Below 15,500 feet and the left or right flaps are equal to or more than 15.

What "idle bug" is being referred to here? I'm not aware of any such thing.If you can't slow down on approach with the gear down and landing flaps out, the problem is likely one of the following:1. Your glidepath is too steep (above 3 degrees)2. You're above max landing weight.3. Your joystick/throttle axis is miscalibrated and is adding thrust that shouldn't be there.The assertions by several people here about the real NG not adding thrust like this are wrong - it most definitely does it and it is described in the manuals. (page 7.20.7 (361 of the PDF) in the FCOM2 - the full technical explanation for how it works is in the maintenance and engineering manuals we have from Boeing that are not included with the product) The criteria for it is flaps 15 or higher set or engine anti-ice on at any flap setting and it stays that way until touchdown - you do NOT chop the throttles in the flare in a modern jet, you land with power on. Please read the landing section of the FTCM.No FS addon has modeled this feature to date and that's likely why you've never seen it before.
Tabs, a lot of people had or is having problems with idle in a clean configuration, under 15500ft.I don't know how many are using cowl AI, so part of them can be excluded.In my case i'm sure I had problems in hotfix 4 with a route I did some time before and after the HF4.The idle was too high, over 40% N1 in some cases, it was difficult to slow down also with speed brakes.I fixed with the sp1, but other found the problem with it or sp1b.Now, I have the problem only wen AI is used.I tested a VNAV with AI used during all the flight. I correctly gave the info in the DES FORECAST page and the ToD was anticipated. No winds, no changes from another test flight, but, with AI on it was nearly impossible to mantain the descent speeds. I know about idle, but, the FMC must made the corrections and when done, the aircraft must fly the path as programmed by the FMC.Also, in another topic I posted a random problem about idle not returning to the lower setting when AI, LG, or flaps are putted back to flight idle condition.Here the video:http://www.youtube.com/watch?v=oX7Gefasr1E

Regards

Andrea Daviero

So, landing 16C at KSEA: gear down F5, the idle was 30.8. Configured idle was 31.8.

Matt Cee

The EEC changes the N2 value to the presets it has. The N1 is slave of it, so, the value you must see for idle cont. is the N2.As you know there is not only a configuration in the world, maybe that idle control on some companies is different.As sometimes gears are used to slow down before flap extension, the idle could be modified to not see the gear extension but only the flaps.I must see it could be an option or if there is a service bulletin for that.The strange thing is that FCOM vol 2 provided by PMDG has no mention about gears, but Ryan confirmed that LG signal is used.

Regards

Andrea Daviero

  • Author

Thank you for the feecback from PMDG. My problem I thought was that the idle was far to high for the landing. My throttle was idling at around 39% with gear down and A/I off. I felt this was to high, and with a re-install for some odd reason, the throttle now idles at around 35% with gear and flaps down. Thanks for your help, and I'll have a look through the manuals.

Ben

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