Troubleshooting Speed Brake Deployment

[Max Clark]

This morning during pre-flight the speed brakes would not deploy.

I cycled the breaker in the plane with no change. Pressing the button on the yoke did not result with anything happening (like the speed brakes even twitching).

I've been looking for things I can do to test & troubleshoot myself (i.e. I'm hoping it's something simple like a faulty switch) but haven't found much.

The brakes were serviced ~200 hours ago. Anything I should be doing before turning this into a bigger project?

 

[Fritz1]

Reset circuit breaker, if that does not get them moving get svc manual with wiring diagram, look for components that affect both speed brakes like yoke switch

[ArtVandelay]

If both aren’t working, I would check the switch first.

[Max Clark]

I’m assuming/hoping/praying it’s the switch. How to I get a copy of the service manual? I’d probably go ahead and order a replacement switch just to have. 

[PT20J]

That looks like a 100 series from the picture. These are pretty simple. Since the brakes have been recently serviced, it's probably the switch or the relay.

100 SERIES SCHEMATIC WIRING.pdf

[ArtVandelay]

I’m assuming/hoping/praying it’s the switch. How to I get a copy of the service manual? I’d probably go ahead and order a replacement switch just to have. 

If it’s the relay, mine is installed in the footwell, looks like this:

It’s installed in a socket, try pulling it, using electronic cleaner and see if that makes a difference. Notice you have easy access to check connections with a multimeter.

[N201MKTurbo]

My speed brakes don’t have a relay, they have a control box in the tail. They don’t have micro switches, they have inductive proximity sensors. If you have that series, I would check the connections to the control box, and the switch.

[geoffb]

6 hours ago, ArtVandelay said:

If it’s the relay, mine is installed in the footwell, looks like this:

It’s installed in a socket, try pulling it, using electronic cleaner and see if that makes a difference. Notice you have easy access to check connections with a multimeter.

My install is like this.  100 series circa ‘98

[Max Clark]

12 hours ago, PT20J said:

That looks like a 100 series from the picture. These are pretty simple. Since the brakes have been recently serviced, it's probably the switch or the relay.

100 SERIES SCHEMATIC WIRING.pdf 488.66 kB · 6 downloads

Thank you for posting this diagram!

That picture is is a link to a previous post on the forums - not my plane.

[Max Clark]

I'm going to head out to the field tomorrow and see what I can figure out (starting with what exactly I have).

[NewMoon]

Get a professional involved. 

[Max Clark]

Anyone have a wiring diagram for a precise flight 2000 handy???