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Landing gear warning trigger

 
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donjohnston



Joined: 13 Dec 2009
Posts: 231

PostPosted: Tue Oct 22, 2013 7:55 am    Post subject: Landing gear warning trigger Reply with quote

I need a trigger device for my gear up warning. The landing gear controller typically uses a micro-switch that detects when the throttle is closed. The routing of my fuel pressure and manifold pressure lines is going to make the mount for such a switch very difficult.

My A&P mentioned that some aircraft use an adjustable pressure sensor tied in to the manifold pressure line to accomplish this.

I'm wondering if anyone knows of a pressure sensor like this.

I'm also open to any other options that I can connect to the landing gear controller.

Thanks,
Don


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rparigoris



Joined: 24 Nov 2009
Posts: 797

PostPosted: Tue Oct 22, 2013 8:57 am    Post subject: Landing gear warning trigger Reply with quote

Hi Don
You can have a look at my throttle position sensor:
http://www.europaowners.org/main.php?g2_itemId=29497
Also have a look at the spring holding down the gear latch and the sensor for that.
Ron Parigoris

> --> AeroElectric-List message posted by: "donjohnston" > <don(at)velocity-xl.com> > > I need a trigger device for my gear up warning. The landing gear > controller typically uses a micro-switch that detects when the throttle is > closed. The routing of my fuel pressure and manifold pressure lines is > going to make the mount for such a switch very difficult. > > My A&P mentioned that some aircraft use an adjustable pressure sensor tied > in to the manifold pressure line to accomplish this. > > I'm wondering if anyone knows of a pressure sensor like this. > > I'm also open to any other options that I can connect to the landing gear > controller. > > Thanks, > Don > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=411104#411104 > > > > > > > > > > > [quote][b]


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nuckolls.bob(at)aeroelect
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PostPosted: Tue Oct 22, 2013 9:20 am    Post subject: Landing gear warning trigger Reply with quote

At 10:55 AM 10/22/2013, you wrote:
Quote:


I need a trigger device for my gear up warning. The landing gear
controller typically uses a micro-switch that detects when the
throttle is closed. The routing of my fuel pressure and manifold
pressure lines is going to make the mount for such a switch very difficult.

My A&P mentioned that some aircraft use an adjustable pressure
sensor tied in to the manifold pressure line to accomplish this.

I'm wondering if anyone knows of a pressure sensor like this.

I'm also open to any other options that I can connect to the landing
gear controller.

Thanks,
Don


this seems a likely solution

http://tinyurl.com/oehkzu9

http://tinyurl.com/ofemkra

Bob . . .


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donjohnston



Joined: 13 Dec 2009
Posts: 231

PostPosted: Tue Oct 22, 2013 11:51 am    Post subject: Re: Landing gear warning trigger Reply with quote

rparigoris wrote:
Hi Don
You can have a look at my throttle position sensor:
http://www.europaowners.org/main.php?g2_itemId=29497
Also have a look at the spring holding down the gear latch and the sensor for that.
Ron Parigoris


Sorry... I should have been more clear. Sad

I'm using a push/pull cable with a knob. The only way (I can see) to detect the throttle position is with a switch at the engine end of the throttle cable.

But thanks anyway.


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james(at)etravel.org
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PostPosted: Tue Oct 22, 2013 12:11 pm    Post subject: Landing gear warning trigger Reply with quote

Don, do you have a photo?  That might prompt some solutions. 

James

On 22 October 2013 20:51, donjohnston <don(at)velocity-xl.com (don(at)velocity-xl.com)> wrote:
[quote]--> AeroElectric-List message posted by: "donjohnston" <don(at)velocity-xl.com (don(at)velocity-xl.com)>


rparigoris wrote:
> Hi Don
>       You can have a look at my throttle position sensor:
>       http://www.europaowners.org/main.php?g2_itemId=29497
>       Also have a look at the spring holding down the gear latch and the sensor for that.
>       Ron Parigoris


Sorry... I should have been more clear. Sad

I'm using a push/pull cable with a knob. The only way (I can see) to detect the throttle position is with a switch at the engine end of the throttle cable.

But thanks anyway.




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=411129#411129







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[b]


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rparigoris



Joined: 24 Nov 2009
Posts: 797

PostPosted: Tue Oct 22, 2013 12:20 pm    Post subject: Landing gear warning trigger Reply with quote

Hi Don
I should have been more clear, I was hinting you could install a magnet somewhere and have it trigger a reed switch. Don't know if feasible. Home Depot sells rare earth magnets that are plenty strong with holes in the center.
Ron P. [quote][b]


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donjohnston



Joined: 13 Dec 2009
Posts: 231

PostPosted: Tue Oct 22, 2013 2:57 pm    Post subject: Re: Landing gear warning trigger Reply with quote

Quote:
Don, do you have a photo? That might prompt some solutions.

James


Not sure that a photo would help here. There's nothing to take a picture of.
rparigoris wrote:
Hi Don
I should have been more clear, I was hinting you could install a magnet somewhere and have it trigger a reed switch. Don't know if feasible. Home Depot sells rare earth magnets that are plenty strong with holes in the center.
Ron P.


I have a standard push/pull cable. It's completely encased. The only place to attach anything would be at the end of the cable where it attaches to the air/throttle inlet control. Which, in my situation, there's no way to put a bracket to mount a switch or sensor to.


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email(at)jaredyates.com
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PostPosted: Tue Oct 22, 2013 3:35 pm    Post subject: Landing gear warning trigger Reply with quote

Instead of throttle linkage position, could you use a manifold pressure transducer?

On Oct 22, 2013, at 18:57, "donjohnston" <don(at)velocity-xl.com> wrote:

Quote:



> Don, do you have a photo? That might prompt some solutions.
>
> James


Not sure that a photo would help here. There's nothing to take a picture of.



rparigoris wrote:
> Hi Don
> I should have been more clear, I was hinting you could install a magnet somewhere and have it trigger a reed switch. Don't know if feasible. Home Depot sells rare earth magnets that are plenty strong with holes in the center.
> Ron P.


I have a standard push/pull cable. It's completely encased. The only place to attach anything would be at the end of the cable where it attaches to the air/throttle inlet control. Which, in my situation, there's no way to put a bracket to mount a switch or sensor to.




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http://forums.matronics.com/viewtopic.php?p=411149#411149












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berkut13(at)berkut13.com
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PostPosted: Tue Oct 22, 2013 3:38 pm    Post subject: Landing gear warning trigger Reply with quote

Huh? The cable itself has to have a bracket to hold the external shell
while the core moves freely. Why not attach the switch to that bracket and
feed a slave rod to it from the arm of the "whatever" you are running.
Still not enough information given.

Again, a picture of your carb/servo/throttle body and cable attachment would
help shed some light on the problem.

-James
--


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user9253



Joined: 28 Mar 2008
Posts: 1929
Location: Riley TWP Michigan

PostPosted: Wed Oct 23, 2013 6:47 am    Post subject: Re: Landing gear warning trigger Reply with quote

How about a RPM switch, all electronic with no moving parts?
Perhaps something like the attached untried circuit.
Joe


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RPM SWITCH.pdf
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donjohnston



Joined: 13 Dec 2009
Posts: 231

PostPosted: Thu Oct 24, 2013 5:57 am    Post subject: Re: Landing gear warning trigger Reply with quote

Quote:
Again, a picture of your carb/servo/throttle body and cable attachment would
help shed some light on the problem.


Okay. Here's some pic's. Hopefully they'll help.


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livingjw(at)earthlink.net
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PostPosted: Thu Oct 24, 2013 7:14 am    Post subject: Landing gear warning trigger Reply with quote

Seems to me that an aluminum bracket and a micro-switch would do the job.

John


On 10/24/2013 9:57 AM, donjohnston wrote:
Quote:

> Again, a picture of your carb/servo/throttle body and cable attachment would
> help shed some light on the problem.

Okay. Here's some pic's. Hopefully they'll help.


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=411310#411310


Attachments:

http://forums.matronics.com//files/img_20131023_115542_266a_166.jpg
http://forums.matronics.com//files/img_20131023_115520_014a_204.jpg


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berkut13(at)berkut13.com
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PostPosted: Thu Oct 24, 2013 7:30 am    Post subject: Landing gear warning trigger Reply with quote

Yep. You already have a fabricated bracket and two anchor bolts available
close by. I'd just re-make the existing bracket (or add a new one) to
extend toward the lever arm and mount a micro switch. You could put an 'L'
shaped tab on the arm using the existing hole to contact the switch if you
need to move the assembly inboard to clear the fuel line.

Or like I mentioned before, mount the switch remotely and activate it with a
slave rod (piano wire) from the lever arm...on either side (push or pull can
work). That's a little more complicated but allows you to work around space
limitations or obstructions if needed.

Simple stuff...bunches of various options. I see no real need for something
complex.

BTW, I hope this you have already addressed this - that mounting clamp looks
not to be fully secured. You don’t want to "pre-disaster" yourself and have
the throttle linkage come loose in flight. Just checking.

-James
Berkut/Race 13
EAA Tech Advisor
--


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klehman(at)albedo.net
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PostPosted: Thu Oct 24, 2013 12:47 pm    Post subject: Landing gear warning trigger Reply with quote

Just a thought. A simple trigger for a gear warning on my amphib, that
has worked rather well, is to use the master caution light on my EIS as
the trigger. I programmed a min rpm warning on the EIS 6000 that is
armed only after climb rpm has been reached or exceeded like several
other warnings. It triggers when rpm is reduced to below cruise values.
In my case an additional verbal audio warning then cycle continues until
the gear hydraulic pressure is brought up to normal. Of course like any
warning, it only works well if you rarely or never get nuisance master
caution warnings.

Ken

On 24/10/2013 11:25 AM, berkut13(at)berkut13.com wrote:
[quote]

Yep. You already have a fabricated bracket and two anchor bolts
available close by. I'd just re-make the existing bracket (or add a new
one) to extend toward the lever arm and mount a micro switch. You could
put an 'L' shaped tab on the arm using the existing hole to contact the
switch if you need to move the assembly inboard to clear the fuel line.

Or like I mentioned before, mount the switch remotely and activate it
with a slave rod (piano wire) from the lever arm...on either side (push
or pull can work). That's a little more complicated but allows you to
work around space limitations or obstructions if needed.

Simple stuff...bunches of various options. I see no real need for
something complex.

BTW, I hope this you have already addressed this - that mounting clamp
looks not to be fully secured. You don’t want to "pre-disaster"
yourself and have the throttle linkage come loose in flight. Just
checking.

-James
Berkut/Race 13
EAA Tech Advisor
--


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donjohnston



Joined: 13 Dec 2009
Posts: 231

PostPosted: Sat Oct 26, 2013 4:50 am    Post subject: Re: Landing gear warning trigger Reply with quote

Quote:
Yep. You already have a fabricated bracket and two anchor bolts available
close by. I'd just re-make the existing bracket (or add a new one) to
extend toward the lever arm and mount a micro switch. You could put an 'L'
shaped tab on the arm using the existing hole to contact the switch if you
need to move the assembly inboard to clear the fuel line.

Nope. That's what is typically done. But the routing of my MAP line doesn't allow for that. I couldn't get a picture showing it, but extending the bracket would require new fittings and a new MAP line to be fabricated. I'm trying to see if there's a workaround.
Quote:
Or like I mentioned before, mount the switch remotely and activate it with a slave rod (piano wire) from the lever arm...on either side (push or pull can work). That's a little more complicated but allows you to work around space limitations or obstructions if needed.


That's a thought. I'll have to look and see how much trouble that's going to be.

Quote:
Simple stuff...bunches of various options. I see no real need for something complex.


Agreed. That's why I was thinking of a MAP switch that would close when the MAP got down to around 12-13"

Quote:
BTW, I hope this you have already addressed this - that mounting clamp looks not to be fully secured. You don’t want to "pre-disaster" yourself and have the throttle linkage come loose in flight. Just checking.

I'm a LONG way off from even starting the engine. Let alone moving under it's own power. When things are tightened/secured, they get some torque seal. Until then, it's easier to remove for other installations and modifications.

Thanks,
Don


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