need help with 777 yoke swiches.

[makoy]

Hi guys,
I have working with my homemade dual yokes and am almost dun.
Only switch i surely know is AP disconnect, but what are those others?
Trims in front side? what about that switch in back of yoke?

Here is link to my "testing of links" video on Youtube.

http://youtu.be/P-f0QsCctv8

Cheers
Marco

[Don]

1. StabTrim -Up & Down
2. Auto-pilot disconnect Switch
3. On rear, Ctr Psn off, top comms ptt, bottom intercom

Rgds
Don

[makoy]

1. StabTrim -Up & Down
2. Auto-pilot disconnect Switch
3. On rear, Ctr Psn off, top comms ptt, bottom intercom

Rgds
Don

Thanks Don,
Can you explain what should happen with these?
AP disconnect i understand, but others.
Is stab trim nose up&down and rudder trim?
What about that rear switch?
Thanks

Marco

[Don]

Stab Trim is Nose Up and Down.....nothing to do with Rudder Trim

The back switch is a rocker switch with the top portion being a PPT, Push to Talk switch, doing the same job as the MIC switch on the outer Glare panel and the MIC switch on the Audio Control Panel on the Pedestal.
The bottom portion is an intercom switch for communication between pilots....in older aircraft it is spring loaded back to centre, but more recent aircraft it is notbspring loaded to centre.

DVDs
Don

[makoy]

Thanks Don, i got it now.
I tough nose up&down is in just one switch.
Okay, so other is up and other is down.
About rear switch, i have switch used in powerwindows of car, i will use those.
Great help, thanks Don.

[tomenglish2000]

Hi Marco.

I think you are a little confused on the trim switches. There are two switches facing the pilot for the trim at the top of the yoke.

They are both for trim up and trim down. Both have to be moved in the same direction to command the trim to move. One switch powers the motor and the other switch grounds the motor. So if you push only one of the switches nothing will happen. This is a safety feature to prevent accidental movement of the trim.

Hope this makes it clearer for you.
Tom.

[makoy]

Yeah of course, why i didnt think that. same thing like in rudder panel, right and left wing down
So, i think also pitch trim in trottle.

Thanks Tom