Precise Flight Speedbrake Switch

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George Wehrung
Posts: 232
Joined: Tue Nov 22, 2022 3:56 pm
Location: KMRH

All,

I am changing out the switch and my stick grip from a toggle type switch that is used with the infinity stick grips. The switch is currently a three position toggle switch with an on off momentary on positions.

I would like to wire in a simple pushbutton switch. The pushbutton switches that infinity arrow uses have three terminals on them. And I wanted to know if anybody had done this and how they did it? In other words, how did you wire each terminal on the switch?

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Ryan Riley
Posts: 177
Joined: Tue Nov 22, 2022 4:59 am
Location: Phoenix

@George Wehrung, I'd give JD at Infinity a call any time after 1300 Pacific time as he's a night owl. He's been very helpful during the order/build for mine.

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-Ryan
Lancair LNC2/Legacy/ES/ES-P Instructor
LOBO Webmaster
2007 Lancair ES
George Wehrung
Posts: 232
Joined: Tue Nov 22, 2022 3:56 pm
Location: KMRH

I talk to him last night, but he didn’t know which switch they needed


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George Wehrung
Posts: 232
Joined: Tue Nov 22, 2022 3:56 pm
Location: KMRH

So thanks to Paul’s advice; I went with the infinityaerospace 8636 switch and as Jon mentions it’s a push on push off. I wired power to the center terminal on the switch and the up and down wires at the outer two.

I decided to use the toggle switch for the flaps. It will be center off, momentary down for extension and up for retract. I haven’t decided which side I prefer the flap and speed brakes on but likely it will be the outer side as it always gets hit when people are getting in and out. I also like the toggle up so the flaps will retract without me having to hold the switch. I am thinking for a go around scenario.


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BobMackey
Posts: 24
Joined: Mon Jun 03, 2024 3:46 pm

Now that I have used the Precise Flight Speedbrakes, I don't think I would consider any location for the switch other than on the stick (or on the throttle if flying HOTAS). When the brakes are deployed, mine often deploy only one side. That's a pretty strong rolling moment that takes nearly full aileron to compensate. I wouldn't want to be finding that switch while violently rolling. I also would not want a push-on-push-off switch. After 5 seconds of asymmetric deployment, the PF controller shuts off the power, slamming the one brake closed.
OK, now that it is closed, what's going to happen next time you push the button? At that time, the button state and brake state is not obvious. Should you push it once to turn it off?

My recommendation after flying with flaky split brakes is
1) a toggle-type switch on the stick
2) where you will not accidentally activate it
3) and a readily accessible and well-labelled power disconnect
George Wehrung
Posts: 232
Joined: Tue Nov 22, 2022 3:56 pm
Location: KMRH

The real question is why is it only deploying on one side? Have you figured that out yet?


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Ryan Riley
Posts: 177
Joined: Tue Nov 22, 2022 4:59 am
Location: Phoenix

Usually a broken or weak spiral spring inside the speedbrake. I went through this with a Mooney. The speedbrakes are incredibly simple to take apart. If they are out of Precise’s warranty, I recommend pulling them out and inspecting.

You can order replacement parts from Precise.


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-Ryan
Lancair LNC2/Legacy/ES/ES-P Instructor
LOBO Webmaster
2007 Lancair ES
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