Jump to content

Sign in to follow this  
billyguo

About the 747 A/T ARM switch.

Recommended Posts

After update to V1R10, I found the A/T ARM doesn't work. Before that, when I ON the A/T. I can see THR REF on PFD.Now I must press VNAV twice then I can see THR REF.

Share this post


Link to post

When arming the A/T in a B744, you don't have any indication in the PFD. (spd mode is empty)Normally before t/o, after arming A/T you only have TOGA pitch and TOGA roll modes in green in your PFD with LNAV/VNAV under it in white when they are armed before your take off and F/D is on.Only the switch position on the MCP gives you an indication that A/T is armed. (This is different in a B737 where you have a white ARM indication when the A/T is armed)B. rgdsMichel

Share this post


Link to post

When I turn the A/T ARM switch ON? Before t/o or after t/o?In "PMDG 747-400 Operating Manuals" I can't clearly find when.So, I leave A/T ARM OFF untill I t/o. But after t/o and climbing I turn on the A/T ARM, the A/T mode doesn't work. In FMC "250/10000" was set. but the airspeed is out of control. PFD is still blank about the throttle reference. When this situation, I must slow down manualy. Or I press VNAV button twice whatever VNAV is ARMed or not.BUT before V1R10. I never reach this problem. Still leave A/T ARM OFF, push throttle, speed up, t/o, climbing, then A/T switch ON. everything is OK.

Share this post


Link to post

Billy (I guess that's your name?),I think that the best you can do is sit down and read this post:http://forums.avsim.net/dcboard.php?az=sho..._id=95618&page=It explains everything you'd want to know about the proper use of A/T.Hope this helps,S


Cheers, Søren Dissing

CPU: Intel i7-7700K @4.8 Ghz | Noctua NH-D15 | GeForce GTX1080 8Gb | MoBo: ASUS Maximus IX Hero | RAM: 32Gb DDR4 2666 | SSDs: 500Gb Samsung M.2 EVO960 (Win drive), 240 Gb Kingston HyperX 3K (P3D drive) | Monitor: 28" ASUS PB287Q 4K | Win 10 Pro 64-Bit | Prepar3d v4.5.12 Professional | FTX Global, OpenLC EU, NA | AS16 & ASCA | Chaseplane

 

 

Share this post


Link to post

According the standard SOP's , A/T switch is set to arm normally, just prior to line up. F/D switch set to on during prefight. LNAV, VNAV may be armed as well before engines start.B. rgdsMichel

Share this post


Link to post

"A/T switch is set to arm normally, just prior to line up."Actually, you'll find that a lot of airlines leave it armed all the time... and if they find it not armed during preflights, they will switch in on when they set up their MCP at the gate.However, it makes sense to arm it just prior to turning onto the runway (for safety reasons).... although the TOGA switches are not so easy to accidentally bump.Cheers.Q>

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...