Ray Allen POS-12 flap position sensor installation

Submitted by Lazy8 Ken Kellner (Ken Kellner) on Fri, 11/18/2022 - 13:44

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I'm looking for installation recommendations (pictures) of Ray Allen POS-12 position sensor on a IV-P to display flap position on G3x. My first guess is to mount it someplace under the rear seat, attached to the flap bell crank. I have searched the site and only found one post. Any suggestions on how to, or how not to, are welcome.

Thanks,
Ken

Ken... here are some pics of

Submitted by GHPORTER on

Ken... here are some pics of my POS-12 install.  I mounted it on the floor under right rear seat and attached it to the flap torque tube.  I got some RC model linkage parts from a friend.

 

Gordon

Attachments: 

Image icon flpa sensor 1
Image icon flap sensor 2
Image icon flap sensor 3
rpastusek's picture

Ken

Submitted by rpastusek on

Ken

I used model airplane control linkage parts like Gordon P to connect a Ray Allen linear position indicator to the flap bellcrank. I bolted a small AL tab to the bellcrank to achieve the correct travel/throw length needed by the sensor. It’s worked without issues for 15 years now…

I’ve looked for a picture w/o success, but could remove my pressure controller to gain access/ take pix if that would help??
Bob

I have one that doesn't work,

Submitted by Dave Taylor on

I have one that doesn't work, if that info is useful to you.
I'll have to get to the airport to take some photos.
The builder attached it to the bellcrank.

When the flaps are physically at 15°, the flap indicator zips to full flaps.
I replaced the indicator in case that was the problem; nope.
I figured there was something wrong with the geometry
I have not yet figured out what will fix it but will be following your thread.

harrelson's picture

I save weight and money. I

Submitted by harrelson on

I save weight and money. I look out the window. For takeoff I match 'em to the full deflection ailerons. For approach flaps I hold 'em down for 3 seconds (gets to the same position as takeoff flaps). Why would you need a flap indicator at all?

 

Bill

 

 

I suspect Bill does the same

Submitted by Dave Taylor on

I suspect Bill does the same as me at night - shine a flashlight out there to see where they are.

I have a very nice

Submitted by docalevy on

I have a very nice installation - photos to follow

very simple and adjustable

Lancairmikees's picture

I'm kind of with Bill on this

Submitted by Lancairmikees on

I'm kind of with Bill on this one. I have a sensor connected to a GRT EFIS for display but in reality never look at it. I do have a AOA which gives me an audible "Flaps" at about 20 degrees deflection though. 

I wonder how the EFIS knows

Submitted by GHPORTER on

I wonder how the EFIS knows the flaps are at 20...?!

Or perhaps the AOA is calibrated to that configuration?

Thanks to all for your input.

Submitted by Lazy8 Ken Kellner on

Thanks to all for your input.  I have included the pictures that are most representative of the responses I have received.

Pictures 1,2 and 3 show a version that also has a micro switch wired to the AOA to automatically change the AOA from "flaps up" to "flaps down" configuration.  The aluminum template was used to find the correct orientation and attach point to get the throw needed. The push rod on this installation was made from remote control airplane linkages. 

Picture A is from a different IV that shows that owners final location of the sensor and push rod to the bell crank.  The sensor can be mounted facing up or facing aft.  Dealers choice.

Other general comments I've received are 1) It is important that the throw of the sensor actuator is such that it does not bottom out on either end, 2) making the push rod length adjustable simplifies things

Ken

Attachments: 

Image icon 1.jpg
Image icon 2.jpg
Image icon 3.jpg
Image icon A.jpg

off-topic question; Ken in

Submitted by Dave Taylor on

off-topic question; Ken in pic 3, what is the black cylinder plumbed in with the 90° twist valve?

Dave,

Submitted by Lazy8 Ken Kellner on

Dave,

Sorry, I don't know what that cylinder is for.  Not my airplane. Maybe emergency gear extension???

Ken 

rpastusek's picture

Dave,

Submitted by rpastusek on

Dave,

Thats my airplane-under construction. It’s a hi-flow fuel filter; one of two I removed before first flight—based on advice from Ed Smith, an expert in these matters. His specific words: “Never put an obstruction such as a filter in the inlet to a pump; after the pump is OK, but not before.”

Bob

Lancairmikees's picture

The EFIS is only a display of

Submitted by Lancairmikees on

The EFIS is only a display of relative position. The AOA is a separate unit connected to a dedicated micro switch that closes at 20 degrees and greater deflection