Jump to content

Sign in to follow this  
JSACKS

Correct way to abort T/O in 744 ?

Recommended Posts

What is the correct way to disconnect the power in aborting a t/o in the Queen? I usually have to unclick the A/T button first and then pull back the throttles. Is this correct for the sim?(Just curious, but how does it work in real life?)Jonathan


Jonathan Sacks

Dell XPS Gen 4, Pentium IV Northwood extreme 3.8Ghz, 3Ghz RAM, eVGA 7900 GTO,

12 GoFlight modules plus MCP-PRO AP and EFIS, GF pedestal, CH rudder pedals,

CH throttle quadrant, 42" LG LED, 24" DELL LCD, Windows XP, FS2004, FSUIPC 3.96

FS Autostart 1.1 (Build 11), FS Navigator 4.6, UT, FE, GE, REX, PMDG, Level-D, PSS, etc.

Share this post


Link to post

Not sure but I suspect in real life once thrust is set the autothrottle enters "HOLD" mode and thus all you need to do is manually push the throttles back all the way to idle, which automatically disconnects the autothrottle servos even though the autothrottle remains armed. After that just sit back and watch autobrakes do the rest or you can also give a little reverse thrust to help in the braking action. Might be a good idea to steer the aircraft as well to maintain rwy centerline!Anyway, read Robert's type course rating 3 which talks specifically of that. The answer lies there, somewhere inbetween exclamaiton points! Best Regards,Victor Limahttp://www.precisionmanuals.com/images/forum/800driver.jpg


Cheers,
Victor M. Lima
 

Share this post


Link to post

"thus all you need to do is manually push the throttles back all the way to idle, which automatically disconnects the autothrottle servos even though the autothrottle remains armed."In HOLD mode, the autothottle SERVO (singular) is already disconnected ;)One servomotor drives all 4 thrust levers via a "clutchpack".Cheers.Q>

Share this post


Link to post

Thank you for the replies.I have an additional question:Suppose there is a significant crosswind when aborting. If I set AUTOBRAKES and they kick in when I retard the throttles, how do I use the rudder to keep ground steering centered without disengaging the autobrakes?Jonathan


Jonathan Sacks

Dell XPS Gen 4, Pentium IV Northwood extreme 3.8Ghz, 3Ghz RAM, eVGA 7900 GTO,

12 GoFlight modules plus MCP-PRO AP and EFIS, GF pedestal, CH rudder pedals,

CH throttle quadrant, 42" LG LED, 24" DELL LCD, Windows XP, FS2004, FSUIPC 3.96

FS Autostart 1.1 (Build 11), FS Navigator 4.6, UT, FE, GE, REX, PMDG, Level-D, PSS, etc.

Share this post


Link to post

"how do I use the rudder to keep ground steering centered without disengaging the autobrakes?"Not sure what you mean, Jonathan... Your pedals should have two separate mechanisms... one for braking and one for steering. 1. For braking, you push on the tops of both pedals with your toes(the pedals are hinged at the bottom causing the pedals to tilt) and...2. For steering, you push the applicable pedal in a linear fashion to make the pedals move fore-aft in a horizontal plane.On the real aircraft, you have a pedal fore-aft adjustment to compensate for leg length which may help you to apply forces in the correct directions on the pedals.Hope this helps.Cheers.Q.

Share this post


Link to post

These procedurers are for a 767 but may be usefull.http://www.smartcockpit.com/


Regards,
Gary Andersen

HAF932 Advanced, ASUS Z170-Deluxe, i7-6700k @4.6,NH-D15, 2x8GB DDR4 3000 15 16 16 35, RM850i PSU,Sata DVD, WD Caviar Black/64mb 1TB storage, W10-Pro on Intel 750 AIC 800GB PCI-Express,EVGA-GTX980Ti, Asus VE276, VS238, Card Reader, SMT750 UPS.

Share this post


Link to post

Jonathan,1)close the thrust leavers aggressivley,and hit the A/T disconnect switch,if in HOLD its not strictly required but we always do to cover the case when it is required,it save you having to think in a hurry.2)manually deploy the speed brake. again this should already be happening automatically but at the moment at least its a company procedure3)use full symetrical reverse as required4)confirm RTO function of the autobrakes, less than 85kts ground speed it wont have engaged.5)bring the aircraft to a stop,set the parking brake,PA to the cabin to remain seated,if applicable,this should stop the cabin crew from initiating an evacuation,and call for an appropriate QRH checklist.As first officer/PNF ,(its all ways the capt who aborts in our company operations) you would monitor the actions, confirm RTO autobrake,tell ATC you`re stopping,and call decreasing airspeeds 100 80 60,and 50 kt ground speed.If it was a high speed reject you are going to have smoke coming off the brakes and soon find yourself surrounded by fire trucks,its all very dramatic! having done one a few years ago at LHR from about 110ktsYou would then need to check your graphs to see how long to wait before attempting another takeoff,chances are you wont be using that aircraft again today!cheersJon

Share this post


Link to post
Guest s_L_Y_F_a

>2)manually deploy the speed brake. again this should already>be happening automatically but at the moment at least its a>company procedure.Should happen automatically? I thought the crew has to deploy them since they do not get armed before takeoff. Or am I missing something :-hmmm

Share this post


Link to post

They will deploy automatically when you pull up on the reversers... not prior to this.Cheers.Q>

Share this post


Link to post

Dear Q:My pedals do indeed have both of those mechanisms. But the reason I asked the question is because it was my understanding from a while back that if Autobrakes are engaged, just touching a rudder pedal could cause them to disengage. Therefore, I was wondering how to use the rudder pedals to steer for a high speed abort if autobrakes have already been engaged. Maybe I didn't understand correctly.Thanks to you and others for jumping into this thread.JS


Jonathan Sacks

Dell XPS Gen 4, Pentium IV Northwood extreme 3.8Ghz, 3Ghz RAM, eVGA 7900 GTO,

12 GoFlight modules plus MCP-PRO AP and EFIS, GF pedestal, CH rudder pedals,

CH throttle quadrant, 42" LG LED, 24" DELL LCD, Windows XP, FS2004, FSUIPC 3.96

FS Autostart 1.1 (Build 11), FS Navigator 4.6, UT, FE, GE, REX, PMDG, Level-D, PSS, etc.

Share this post


Link to post

Jon:I didn't realize you would also use reversers. This could be tricky if an engine has gone out, no? Would not Autobrakes suffice even for a MGTOW abort?Jonathan


Jonathan Sacks

Dell XPS Gen 4, Pentium IV Northwood extreme 3.8Ghz, 3Ghz RAM, eVGA 7900 GTO,

12 GoFlight modules plus MCP-PRO AP and EFIS, GF pedestal, CH rudder pedals,

CH throttle quadrant, 42" LG LED, 24" DELL LCD, Windows XP, FS2004, FSUIPC 3.96

FS Autostart 1.1 (Build 11), FS Navigator 4.6, UT, FE, GE, REX, PMDG, Level-D, PSS, etc.

Share this post


Link to post

jonathan,the first officer should call inboards or outboards, you then select all 4 to idle but only use a symetrical pair. reverse is used as you need all the stoping power you can get, a RTO is a very aggressive drill.performance calculations use reverse thrust for wet runways but not dry,but it is all ways used.As Q mentions selecting idle reverse will automatically deploy the speedbrakes, either in a RTO or a landing, wether they are armed or not.cheersjon

Share this post


Link to post

Jon:OK, mate, thanks again.Good thread, thanks all!Jonathan


Jonathan Sacks

Dell XPS Gen 4, Pentium IV Northwood extreme 3.8Ghz, 3Ghz RAM, eVGA 7900 GTO,

12 GoFlight modules plus MCP-PRO AP and EFIS, GF pedestal, CH rudder pedals,

CH throttle quadrant, 42" LG LED, 24" DELL LCD, Windows XP, FS2004, FSUIPC 3.96

FS Autostart 1.1 (Build 11), FS Navigator 4.6, UT, FE, GE, REX, PMDG, Level-D, PSS, etc.

Share this post


Link to post

"it was my understanding from a while back that if Autobrakes are engaged, just touching a rudder pedal could cause them to disengage."A misunderstanding, JS... They should only disengage if you touch the tops of the rudder pedals.Cheers.Q>

Share this post


Link to post

Ah, OK, thanks. So I still need to be careful how I angle my feet !Jonathan


Jonathan Sacks

Dell XPS Gen 4, Pentium IV Northwood extreme 3.8Ghz, 3Ghz RAM, eVGA 7900 GTO,

12 GoFlight modules plus MCP-PRO AP and EFIS, GF pedestal, CH rudder pedals,

CH throttle quadrant, 42" LG LED, 24" DELL LCD, Windows XP, FS2004, FSUIPC 3.96

FS Autostart 1.1 (Build 11), FS Navigator 4.6, UT, FE, GE, REX, PMDG, Level-D, PSS, etc.

Share this post


Link to post

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  
  • Tom Allensworth,
    Founder of AVSIM Online


  • Flight Simulation's Premier Resource!

    AVSIM is a free service to the flight simulation community. AVSIM is staffed completely by volunteers and all funds donated to AVSIM go directly back to supporting the community. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. Thank you for your support!

    Click here for more information and to see all donations year to date.
  • Donation Goals

    AVSIM's 2020 Fundraising Goal

    Donate to our annual general fundraising goal. This donation keeps our doors open and providing you service 24 x 7 x 365. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. We reset this goal every new year for the following year's goal.


    2%
    $540.00 of $25,000.00 Donate Now
×
×
  • Create New...