Auto Throttle

M

meritflyer

Well-Known Member
How exactly do these auto throttle systems work? Do you plug in your speed to the FMS and BINGO?

I read today that Piper has included auto throttle on their VLJ.
 
There's a lil ticker on the A/P panel that has mach or IAS hold. You plug in .83 and push the mach hold button and flip on A/T or you can plu gin your 300 or whatever you want for ias.
 
I thought TOGA meant take off go around. I have no idea what it does.

That's like the autobrakes: If you use it in flight sim it means you're a homo.
 
n57flyguy said:
TOGA?
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Takeoff/Go-Around button located on the thrust levers. In the CL-65, it captures the current heading and provides an initial 15 degrees nose-up flight director guidance for takeoff. For a go-around, it disconnects the autopilot (if engaged), captures the current heading, and provides 10 degrees nose-up FD guidance.

TOGA! TOGA!
 
C150J said:
Takeoff/Go-Around button located on the thrust levers. In the CL-65, it captures the current heading and provides an initial 15 degrees nose-up flight director guidance for takeoff. For a go-around, it disconnects the autopilot (if engaged), captures the current heading, and provides 10 degrees nose-up FD guidance.

TOGA! TOGA!
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doesn't it use max thrust as well?
 
PGT said:
doesn't it use max thrust as well?
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The 200s don't have autothrottles, so all it does is carrot (on the N1 gauges) either T/O thrust (which can also be flex'd) or GA thrust. PNF has to set it. Not sure about the 700s/900s...

J.
 
frog_flyer said:
I thought TOGA meant take off go around. I have no idea what it does.

That's like the autobrakes: If you use it in flight sim it means you're a homo.
Click to expand...

TOGA does stand for takeoff/go around and it sets autopilot modes. For example on the 145 pressing TOGA on the ground will give you ROL mode (roll hold) with wings level for horizontal mode and TO mode for pitch (14/13 deg noseup depending on flaps). If you press them airborne you get the same but a 10 deg nose up. If you press them airborne but very low/slow (rejected landing) you get a funky mode for low energy rejection.
 
Basically autothrottles will actuate the throttles to maintain either a desired speed or an EPR/N1 setting.

Desired takeoff power setting during takeoff, go-around EPR during go arounds, etc.

It'll look at the FMS or the speed window on the FGS/autopilot panel depending on which mode you have it in.
 
Autothrottles are my new best friend! In my transition from the Barbie Fun-Jet to Boeing the vertical navigation of the FMS was the toughest concept to learn, but waaay cool!

The FMS (FMCs as we call them) have preprogrammed speeds and altitudes based on programmed winds, pressure, temps, and "cost index" that adjust the pitch and power (autothrottles) to make the most efficient descent profile. We've got RNP RNAV approaches into SE Alaska that the airplane flies itself from the flight levels to 300AGL. Perfect every time with towering cumulo-granite less than a half-mile off either wing!

Flying complicated arrivals with multiple stepdowns in the RJ was constant work adjusting speed, descent rate, and power. Now in the 737 we just push "<DESCEND NOW" and the airplane does all the work!
 
meritflyer said:
Do you ever feel like pushing buttons takes a little flying out of flying though?
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Well, if it weren't for autothrottles/EEC's, you'd be looking up EPR settings on a chart, moving bugs and tweaking the throttles every couple thousand feet to maintain a climb power setting.
 
Doug Taylor said:
Well, if it weren't for autothrottles/EEC's, you'd be looking up EPR settings on a chart, moving bugs and tweaking the throttles every couple thousand feet to maintain a climb power setting.
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And that's not fun? Remember us little guys still have to move the throttle by hand. Granted the FMS fills in the carrots for us, but we do the pushing.

Jeesh... big jet guys.:)
 
on the -200 the TOGA's will throw up G/A carrots, heading hold, and the F/D goes to approx 15deg nose up, the missed approach proc comes up on the FMS and MFD. no autothrottle but its fun to have something to do....:nana2:
 
higney85 said:
on the -200 the TOGA's will throw up G/A carrots, heading hold, and the F/D goes to approx 15deg nose up, the missed approach proc comes up on the FMS and MFD. no autothrottle but its fun to have something to do....:nana2:
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Oh i assure you on an actual go-around you will have a lot more to do than just bump up the throttles.
 
meritflyer said:
How exactly do these auto throttle systems work?
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<Smartass freightdawg comment>
My right hand automatically pushes the power lever to the first redline on takeoff.
My right hand automatically brings it from redline to idle at 200 above for landing.
</smartass freight dawg comment>
 
Doug Taylor said:
Well, if it weren't for autothrottles/EEC's, you'd be looking up EPR settings on a chart, moving bugs and tweaking the throttles every couple thousand feet to maintain a climb power setting.
Click to expand...


That's what engineers are for, wait, oh dammit..................
 
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