Why can't wing-mounted spoilers be used to steepen approaches? The 2019 Stack Overflow Developer Survey Results Are InWhat prevents aircraft with a tailcone APU from using tail-mounted airbrakes?When can spoilers be used on airliners?Why do planes make landing approaches at significantly varying heights?If airplanes can't use reverse thrust in flight, what am I hearing?Do flaps have a maximum speed limit but spoilers don't? Why?Why do spoilers seem to be slightly activated during take off?Why is the pilot in this video retracting the spoilers so shortly after landing?Why don't some spoilers plates fully open in most airliners?Why do outboard spoilers deploy more than the inboard spoiler on the A320?Are ASR and PAR approaches commonly used in Europe?Is the callout “minimums” on the 737 used to describe DH on precision approaches

Variable with quotation marks "$()"

How can I add encounters in the Lost Mine of Phandelver campaign without giving PCs too much XP?

How to notate time signature switching consistently every measure

What was the last CPU that did not have the x87 floating-point unit built in?

Is an up-to-date browser secure on an out-of-date OS?

Likelihood that a superbug or lethal virus could come from a landfill

Loose spokes after only a few rides

Did Scotland spend $250,000 for the slogan "Welcome to Scotland"?

What is the meaning of Triage in Cybersec world?

Why didn't the Event Horizon Telescope team mention Sagittarius A*?

Why doesn't UInt have a toDouble()?

If climate change impact can be observed in nature, has that had any effect on rural, i.e. farming community, perception of the scientific consensus?

How to quickly solve partial fractions equation?

Is it okay to consider publishing in my first year of PhD?

Is it ok to offer lower paid work as a trial period before negotiating for a full-time job?

Why not take a picture of a closer black hole?

"as much details as you can remember"

What could be the right powersource for 15 seconds lifespan disposable giant chainsaw?

Pokemon Turn Based battle (Python)

Deal with toxic manager when you can't quit

A word that means fill it to the required quantity

Can there be female White Walkers?

What is the motivation for a law requiring 2 parties to consent for recording a conversation

How to support a colleague who finds meetings extremely tiring?



Why can't wing-mounted spoilers be used to steepen approaches?



The 2019 Stack Overflow Developer Survey Results Are InWhat prevents aircraft with a tailcone APU from using tail-mounted airbrakes?When can spoilers be used on airliners?Why do planes make landing approaches at significantly varying heights?If airplanes can't use reverse thrust in flight, what am I hearing?Do flaps have a maximum speed limit but spoilers don't? Why?Why do spoilers seem to be slightly activated during take off?Why is the pilot in this video retracting the spoilers so shortly after landing?Why don't some spoilers plates fully open in most airliners?Why do outboard spoilers deploy more than the inboard spoiler on the A320?Are ASR and PAR approaches commonly used in Europe?Is the callout “minimums” on the 737 used to describe DH on precision approaches










1












$begingroup$


In a comment on this answer to my previous question about tail-mounted airbrakes (lack of), @JohnK states:




You won't see flight spoilers (speed brakes) being used to steepen approaches. You have to be 10kt above Vref to extend them on a CRJ900 and you shouldn't be that hot in the first place, and you aren't allowed to use them at all below 300 ft.




Why do you have to be going abnormally fast to slow down with the spoilers, and why can't they be used at low altitude (especially given that, just like with airbrakes, it would seem to me like spoiler extension would be a safer method of slowing down than pulling the throttle all the way back would be, since, should a go-around become necessary, the spoilers can retract a lot more quickly than the engines can spool up from idle to TOGA)?










share|improve this question









$endgroup$











  • $begingroup$
    Engines are never at idle on approach until the landing flare for that exact reason.
    $endgroup$
    – Ben
    1 hour ago















1












$begingroup$


In a comment on this answer to my previous question about tail-mounted airbrakes (lack of), @JohnK states:




You won't see flight spoilers (speed brakes) being used to steepen approaches. You have to be 10kt above Vref to extend them on a CRJ900 and you shouldn't be that hot in the first place, and you aren't allowed to use them at all below 300 ft.




Why do you have to be going abnormally fast to slow down with the spoilers, and why can't they be used at low altitude (especially given that, just like with airbrakes, it would seem to me like spoiler extension would be a safer method of slowing down than pulling the throttle all the way back would be, since, should a go-around become necessary, the spoilers can retract a lot more quickly than the engines can spool up from idle to TOGA)?










share|improve this question









$endgroup$











  • $begingroup$
    Engines are never at idle on approach until the landing flare for that exact reason.
    $endgroup$
    – Ben
    1 hour ago













1












1








1





$begingroup$


In a comment on this answer to my previous question about tail-mounted airbrakes (lack of), @JohnK states:




You won't see flight spoilers (speed brakes) being used to steepen approaches. You have to be 10kt above Vref to extend them on a CRJ900 and you shouldn't be that hot in the first place, and you aren't allowed to use them at all below 300 ft.




Why do you have to be going abnormally fast to slow down with the spoilers, and why can't they be used at low altitude (especially given that, just like with airbrakes, it would seem to me like spoiler extension would be a safer method of slowing down than pulling the throttle all the way back would be, since, should a go-around become necessary, the spoilers can retract a lot more quickly than the engines can spool up from idle to TOGA)?










share|improve this question









$endgroup$




In a comment on this answer to my previous question about tail-mounted airbrakes (lack of), @JohnK states:




You won't see flight spoilers (speed brakes) being used to steepen approaches. You have to be 10kt above Vref to extend them on a CRJ900 and you shouldn't be that hot in the first place, and you aren't allowed to use them at all below 300 ft.




Why do you have to be going abnormally fast to slow down with the spoilers, and why can't they be used at low altitude (especially given that, just like with airbrakes, it would seem to me like spoiler extension would be a safer method of slowing down than pulling the throttle all the way back would be, since, should a go-around become necessary, the spoilers can retract a lot more quickly than the engines can spool up from idle to TOGA)?







approach spoilers






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 3 hours ago









SeanSean

5,98232875




5,98232875











  • $begingroup$
    Engines are never at idle on approach until the landing flare for that exact reason.
    $endgroup$
    – Ben
    1 hour ago
















  • $begingroup$
    Engines are never at idle on approach until the landing flare for that exact reason.
    $endgroup$
    – Ben
    1 hour ago















$begingroup$
Engines are never at idle on approach until the landing flare for that exact reason.
$endgroup$
– Ben
1 hour ago




$begingroup$
Engines are never at idle on approach until the landing flare for that exact reason.
$endgroup$
– Ben
1 hour ago










1 Answer
1






active

oldest

votes


















5












$begingroup$

They can. The Airbus A318 does this in steep approach mode. You can see spoilers extended in this video of a landing at London City Airport.



Going back further, the Lockheed L-1011 did this with a system called Direct Lift Control. When landing flaps were selected, spoilers raised a set amount. Small movements on the yoke raised or lowered the spoilers instead of adjusting the elevators. This made for a very smooth approach and landing.



The common point is that both these aircraft use electronics for spoiler control. It's too complicated to do this in a cable flight control system. You need to have the system retract the spoilers quickly in cases like go-around and stalls. As I recall, steep approach mode on the A318 activates a different set of gains on the flight control loops for better handling qualities in that configuration.



Finally, a number of fighters have the same system, and some glider pilots do this manually.






share|improve this answer











$endgroup$













    Your Answer





    StackExchange.ifUsing("editor", function ()
    return StackExchange.using("mathjaxEditing", function ()
    StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix)
    StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
    );
    );
    , "mathjax-editing");

    StackExchange.ready(function()
    var channelOptions =
    tags: "".split(" "),
    id: "528"
    ;
    initTagRenderer("".split(" "), "".split(" "), channelOptions);

    StackExchange.using("externalEditor", function()
    // Have to fire editor after snippets, if snippets enabled
    if (StackExchange.settings.snippets.snippetsEnabled)
    StackExchange.using("snippets", function()
    createEditor();
    );

    else
    createEditor();

    );

    function createEditor()
    StackExchange.prepareEditor(
    heartbeatType: 'answer',
    autoActivateHeartbeat: false,
    convertImagesToLinks: false,
    noModals: true,
    showLowRepImageUploadWarning: true,
    reputationToPostImages: null,
    bindNavPrevention: true,
    postfix: "",
    imageUploader:
    brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
    contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
    allowUrls: true
    ,
    noCode: true, onDemand: true,
    discardSelector: ".discard-answer"
    ,immediatelyShowMarkdownHelp:true
    );



    );













    draft saved

    draft discarded


















    StackExchange.ready(
    function ()
    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faviation.stackexchange.com%2fquestions%2f62296%2fwhy-cant-wing-mounted-spoilers-be-used-to-steepen-approaches%23new-answer', 'question_page');

    );

    Post as a guest















    Required, but never shown

























    1 Answer
    1






    active

    oldest

    votes








    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    5












    $begingroup$

    They can. The Airbus A318 does this in steep approach mode. You can see spoilers extended in this video of a landing at London City Airport.



    Going back further, the Lockheed L-1011 did this with a system called Direct Lift Control. When landing flaps were selected, spoilers raised a set amount. Small movements on the yoke raised or lowered the spoilers instead of adjusting the elevators. This made for a very smooth approach and landing.



    The common point is that both these aircraft use electronics for spoiler control. It's too complicated to do this in a cable flight control system. You need to have the system retract the spoilers quickly in cases like go-around and stalls. As I recall, steep approach mode on the A318 activates a different set of gains on the flight control loops for better handling qualities in that configuration.



    Finally, a number of fighters have the same system, and some glider pilots do this manually.






    share|improve this answer











    $endgroup$

















      5












      $begingroup$

      They can. The Airbus A318 does this in steep approach mode. You can see spoilers extended in this video of a landing at London City Airport.



      Going back further, the Lockheed L-1011 did this with a system called Direct Lift Control. When landing flaps were selected, spoilers raised a set amount. Small movements on the yoke raised or lowered the spoilers instead of adjusting the elevators. This made for a very smooth approach and landing.



      The common point is that both these aircraft use electronics for spoiler control. It's too complicated to do this in a cable flight control system. You need to have the system retract the spoilers quickly in cases like go-around and stalls. As I recall, steep approach mode on the A318 activates a different set of gains on the flight control loops for better handling qualities in that configuration.



      Finally, a number of fighters have the same system, and some glider pilots do this manually.






      share|improve this answer











      $endgroup$















        5












        5








        5





        $begingroup$

        They can. The Airbus A318 does this in steep approach mode. You can see spoilers extended in this video of a landing at London City Airport.



        Going back further, the Lockheed L-1011 did this with a system called Direct Lift Control. When landing flaps were selected, spoilers raised a set amount. Small movements on the yoke raised or lowered the spoilers instead of adjusting the elevators. This made for a very smooth approach and landing.



        The common point is that both these aircraft use electronics for spoiler control. It's too complicated to do this in a cable flight control system. You need to have the system retract the spoilers quickly in cases like go-around and stalls. As I recall, steep approach mode on the A318 activates a different set of gains on the flight control loops for better handling qualities in that configuration.



        Finally, a number of fighters have the same system, and some glider pilots do this manually.






        share|improve this answer











        $endgroup$



        They can. The Airbus A318 does this in steep approach mode. You can see spoilers extended in this video of a landing at London City Airport.



        Going back further, the Lockheed L-1011 did this with a system called Direct Lift Control. When landing flaps were selected, spoilers raised a set amount. Small movements on the yoke raised or lowered the spoilers instead of adjusting the elevators. This made for a very smooth approach and landing.



        The common point is that both these aircraft use electronics for spoiler control. It's too complicated to do this in a cable flight control system. You need to have the system retract the spoilers quickly in cases like go-around and stalls. As I recall, steep approach mode on the A318 activates a different set of gains on the flight control loops for better handling qualities in that configuration.



        Finally, a number of fighters have the same system, and some glider pilots do this manually.







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited 1 hour ago

























        answered 1 hour ago









        user71659user71659

        3,500925




        3,500925



























            draft saved

            draft discarded
















































            Thanks for contributing an answer to Aviation Stack Exchange!


            • Please be sure to answer the question. Provide details and share your research!

            But avoid


            • Asking for help, clarification, or responding to other answers.

            • Making statements based on opinion; back them up with references or personal experience.

            Use MathJax to format equations. MathJax reference.


            To learn more, see our tips on writing great answers.




            draft saved


            draft discarded














            StackExchange.ready(
            function ()
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faviation.stackexchange.com%2fquestions%2f62296%2fwhy-cant-wing-mounted-spoilers-be-used-to-steepen-approaches%23new-answer', 'question_page');

            );

            Post as a guest















            Required, but never shown





















































            Required, but never shown














            Required, but never shown












            Required, but never shown







            Required, but never shown

































            Required, but never shown














            Required, but never shown












            Required, but never shown







            Required, but never shown







            Popular posts from this blog

            Möglingen Índice Localización Historia Demografía Referencias Enlaces externos Menú de navegación48°53′18″N 9°07′45″E / 48.888333333333, 9.129166666666748°53′18″N 9°07′45″E / 48.888333333333, 9.1291666666667Sitio web oficial Mapa de Möglingen«Gemeinden in Deutschland nach Fläche, Bevölkerung und Postleitzahl am 30.09.2016»Möglingen

            Virtualbox - Configuration error: Querying “UUID” failed (VERR_CFGM_VALUE_NOT_FOUND)“VERR_SUPLIB_WORLD_WRITABLE” error when trying to installing OS in virtualboxVirtual Box Kernel errorFailed to open a seesion for the virtual machineFailed to open a session for the virtual machineUbuntu 14.04 LTS Virtualbox errorcan't use VM VirtualBoxusing virtualboxI can't run Linux-64 Bit on VirtualBoxUnable to insert the virtual optical disk (VBoxguestaddition) in virtual machine for ubuntu server in win 10VirtuaBox in Ubuntu 18.04 Issues with Win10.ISO Installation

            Torre de la Isleta Índice Véase también Referencias Bibliografía Enlaces externos Menú de navegación38°25′58″N 0°23′02″O / 38.43277778, -0.3838888938°25′58″N 0°23′02″O / 38.43277778, -0.38388889Torre de la Illeta de l’Horta o Torre Saleta. Base de datos de bienes inmuebles. Patrimonio Cultural. Secretaría de Estado de CulturaFicha BIC Torre de la Illeta de l’Horta. Dirección General de Patrimonio Cultural. Generalitat ValencianaLugares de interés. Ayuntamiento del CampelloTorre de la Isleta en CastillosNet.org