Jump to content

Sign in to follow this  
rondon9898

Setting stab trim before engine start

Recommended Posts

1 hour ago, rwy23 said:

I have to say I didn't know that....but I knew they are available on yoke (left handle), but why you not suppose to move that? Any difference in set up? Would be good to know..

For your reading pleasure 777 FCOM 9.20.10 - 9.20.11; the first thing you should have noticed is the levers are labeled "ALTN PITCH TRIM,"  most all aircraft with electric trim are trimmed primarily with the switches on the stick/yoke.

If you are using P3D you don't need FSUIPC for the controller buttons, just assign the buttons directly in P3D controls UI.


Dan Downs KCRP

Share this post


Link to post
Share on other sites

To be honest, I think I read all manuals, but I have to admit that I was concentrated on something else I was searching that I missed that thinking I knew that...but thank you for answer....


NWA022 - Alexander Luzajic

Share this post


Link to post
Share on other sites

The Altn Switches bypass some of the safety systems on the 747-400 and have a different effect on the autopilot, depending on the autopilot mode. This is why you should normally use the control column trim switches.


John H Watson (retired 744/767 Avionics engineer)

Share this post


Link to post
Share on other sites
16 hours ago, rwy23 said:

I think I watched your video on YT setting the trim.

I may have been looking down in that area while setting the trim because the indicator is there, but I highly doubt you've seen a video of me working them unless it's one of those videos where I go over every option/button/switch in the plane.


Kyle Rodgers

Share this post


Link to post
Share on other sites
16 hours ago, rwy23 said:

I did not set buttons for that thru FSUIPC...that might be the option...

Nope. As mentioned, set it up quite literally, in the sim itself using the default sim controls screen.


Kyle Rodgers

Share this post


Link to post
Share on other sites
1 hour ago, scandinavian13 said:

I may have been looking down in that area while setting the trim because the indicator is there, but I highly doubt you've seen a video of me working them unless it's one of those videos where I go over every option/button/switch in the plane.

Could be not sure....You were showing start from C&D and set-up.....

Thanks Kyle


NWA022 - Alexander Luzajic

Share this post


Link to post
Share on other sites
14 hours ago, Qavion2 said:

The Altn Switches bypass some of the safety systems on the 747-400 and have a different effect on the autopilot, depending on the autopilot mode. This is why you should normally use the control column trim switches.

John is correct, the control column stab trim switches are Primary and should be used first. The Alternate Trim switches trim at the same rate as the control column switches, have greater forward travel compared with the control column switches, but they react different if an A/P or A/P's are engaged.

In the case of the control column switches, if you trim with a single A/P engaged, the A/P will disconnect. If you are in multiple autopilot mode below 1500 RA on a triple channel ILS approach and trim, nothing happens as the trim is inhibited if you try to trim.

If you trim using the Alternate Switches in single or multiple A/P modes, they will trim and the A/P will sense trim is coming from somewhere other than the A/P, and you will get an Unscheduled Stabilizer Trim message. Alternate also bypasses the control column cutout feature, so for all these reasons, Alternate is just that...Alternate, to be used if the Primary trim system does not trim. 


Alexander L Pavlis

Captain Al    http://subsonicflighttraining.com

 

Share this post


Link to post
Share on other sites

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.


    28%
    $7,035.00 of $25,000.00 Donate Now
×
×
  • Create New...