Auto Pilot

[eddies]

Hi Guys,

Last weekend I was flying in moderate turbulence using the auto pilot and it was doing really well in all the thermals.

After about 1 hour I started getting pitch slip messages and shortly after that the auto pilot disengaged with a audible warning message.

When I tried to re-engage the auto pilot I got a pitch servo error and the auto pilot immediately disconnected.

What would cause this to occur?

Have I perhaps broken the shear pin on the pitch servo?

I tried to engage only the wing leveler but I could not get this to engage either.

Any suggestions on how to fault find this would be appreciated.

Eddie

 

[dynonsupport]

The servo cannot detect a broken shear screw. You can only determine the shear screw is broken by a manual examination of the servo.

If you're flying within the engagement limits of the AP, either a fault has developed in the wiring to the servo, or the servo itself has failed. Please contact Dynon Avionics Technical Support to have a Return Material Authorization (RMA) opened for the servo if you determine that there is no fault with the wiring.

Hi Guys,

Last weekend I was flying in moderate turbulence using the auto pilot and it was doing really well in all the thermals.

After about 1 hour I started getting pitch slip messages and shortly after that the auto pilot disengaged with a audible warning message.

When I tried to re-engage the auto pilot I got a pitch servo error and the auto pilot immediately disconnected.

What would cause this to occur?

Have I perhaps broken the shear pin on the pitch servo?

I tried to engage only the wing leveler but I could not get this to engage either.

Any suggestions on how to fault find this would be appreciated.

Eddie

 

[eddies]

The servo cannot detect a broken shear screw. You can only determine the shear screw is broken by a manual examination of the servo.

If you're flying within the engagement limits of the AP, either a fault has developed in the wiring to the servo, or the servo itself has failed. Please contact Dynon Avionics Technical Support to have a Return Material Authorization (RMA) opened for the servo if you determine that there is no fault with the wiring.

Hi Support,

What are the steps that I should follow to fault find this, I understand how to check the wiring but how do I fault find the servo?

Regards
Eddie

 

[dynonsupport]

Eddie:

To check whether the shear screw is broken:
1. Get physical access to the servo.
2. With one thumb and forefinger of one hand, grasp the disc under the arm or capstan of the servo.
3. With the other hand, shake the controls connected to that servo.
4. While shaking the controls, you should feel a 1:1 movement of the disc with the shaking of the controls. This indicates the shear screw is intact.
5. If you DON'T feel the 1:1 movement, the shear screw is probably broken. Fill out the form at http://dynonavionics.com/shearscrew to request a replacement shearscrew.

 

[eddies]

Eddie:

To check whether the shear screw is broken:
1. Get physical access to the servo.
2. With one thumb and forefinger of one hand, grasp the disc under the arm or capstan of the servo.
3. With the other hand, shake the controls connected to that servo.
4. While shaking the controls, you should feel a 1:1 movement of the disc with the shaking of the controls. This indicates the shear screw is intact.
5. If you DON'T feel the 1:1 movement, the shear screw is probably broken. Fill out the form at http://dynonavionics.com/shearscrew to request a replacement shearscrew.

[quote
Hi Support,

What are the steps that I should follow to fault find this, I understand how to check the wiring but how do I fault find the servo?

Regards
Eddie

[/quote]

Thanks for that.

Besides the possible wiring issue (things have been working fine for 3.5 years), what I was really after is how to fault find the issue with the servo engaging and disengaging. Is there a test procedure that I should follow?

Should I attempt to re-calibrate the servo, force a network rediscovery etc.

Eddie

 

[jakej]

Eddie

IF you have a broken screw then I can ship you one, it will be a lot quicker 

Jake J
Adelaide

 

[dynonsupport]

Eddie:

At this point, for specific problems with specific aircraft, we recommend that you get in direct contact with Dynon Avionics Technical Support - 425-402-0433 or support AT dynonavionics DOT com.

Thanks for that.

Besides the possible wiring issue (things have been working fine for 3.5 years), what I was really after is how to fault find the issue with the servo engaging and disengaging. Is there a test procedure that I should follow?

Should I attempt to re-calibrate the servo, force a network rediscovery etc.

Eddie

 

[eddies]

Eddie:

At this point, for specific problems with specific aircraft, we recommend that you get in direct contact with Dynon Avionics Technical Support - 425-402-0433 or support AT dynonavionics DOT com.

Thanks for that.

Besides the possible wiring issue (things have been working fine for 3.5 years), what I was really after is how to fault find the issue with the servo engaging and disengaging. Is there a test procedure that I should follow?

Should I attempt to re-calibrate the servo, force a network rediscovery etc.

Eddie

OK will do thanks

Eddie

 

[eddies]

Eddie

IF you have a broken screw then I can ship you one, it will be a lot quicker 

Jake J
Adelaide

Thanks Jake ;-)

 

[eddies]

Hello,

I sent support an email yesterday but have not had a response ?

Cheers
Eddie

 

[Dynon]

Hi Eddie - I see a note that we talked to you on the phone this afternoon. If that's not the case, let us know - we may have inadvertently mistook another customer for you.

 

[eddies]

Hi Eddie - I see a note that we talked to you on the phone this afternoon. If that's not the case, let us know - we may have inadvertently mistook another customer for you.

That is definitely not the case

Eddie

 

[eddies]

Hi Guys,

I am still waiting for someone in support to respond to my questions?

I have sent 3 emails so far.

Regards
Eddie

 

[Dynon]

Hi Eddie - We had our wires crossed here (we try to get back to every email within a day, and we took longer than that in this case). It looks like you've got a dialog going with our support team now. Sorry for the delay.