SV-AP-PANEL wiring question

[kurtfly]

I am installing the trim wiring for my skyview A/P panel and have a question.
My current configuration has both pilot and Co-Pilot trim switches on the sticks. These are directly connected to power and the motors.
Is it permissible and prudent to leave the co-pilot switch connected as is, directly from power to trim motors. Not going thru the SV-AP-Panel. This would provide a alternate trim control should the SV-AP-Panel become in-op.

 

[dynonsupport]

Kurt:

If you do leave the connections for the Co-Pilot trim controls as-is, likely the SV-AP-PANEL will be damaged; we didn't make provision for power being applied to the outputs when the SV-AP-PANEL isn't providing power. For example, if the copilot tried to trim down, but the SV-AP-PANEL is trying to trim up, you're essentially shorting out the power and the circuit breaker will blow.

You'll have to choose either full manual (your current wiring) OR wiring through the SV-AP-PANEL.

I am installing the trim wiring for my skyview A/P panel and have a question. 
My current configuration has both pilot and Co-Pilot trim switches on the sticks.  These are directly connected to power and the motors. 
Is it permissible and prudent to leave the co-pilot switch connected as is, directly from power to trim motors.  Not going thru the SV-AP-Panel.  This would provide a alternate trim control should the SV-AP-Panel become in-op.

 

[kurtfly]

Thank you! I will wire both trim switches thru the SV-AP_Panel.

 

[AlanR]

This is interesting....
In the UK the LAA are saying to me that they are not yet fully 'on board' with giving approval to the A/P SV-AP-PANEL controlling the trims and particularly Autotrim. They are suggesting to me that I may have to fit a disconnect or interrupt switch if I wire the trims through the module.
I can't quite see how I could do this and it would also mean wiring both ways manually and through the SV-AP-PANEL.
Any thoughts please Dynon?
 

 

[dynonsupport]

Alan,
The power that goes into the AP panel from ship's power is the power that runs the trim. If you run this through a switch or a pull-able breaker, you will be able to turn this off and stop the trim motion.

As for autotrim, it already has a disconnect in the form of the AP disconnect. If the AP is off, autotrim doesn't run. If they don't trust the software, the fact that it autotrims doesn't really matter, since auto trim is just the AP pressing the trim button for you now and then. The AP control panel doesn't really know the difference from the AP software up in SkyView asking for trim or the user pressing the buttons on the stick.

If the LAA requires that you also have a backup to move trim after you have removed power from the AP module, then that is more complex. Ask them why they allow relays, mechanical switches, and plastic trim servos without backups, when mechanical devices fail all the time

 

[AlanR]

Thanks for the thoughts Dynon.

I have a feeling that it is going to be a long road convincing the UK LAA of the integrity of the SV-AP-PANEL and autotrim.
I will probably need more help in the coming months over this before I get approval.

 

[AlanR]

Dynon ...Can I ask another question please on this topic.

With the autopilot on and Autotrim working, can the trim be still controlled by the trim on the stick?... or not? In other words do you have the option of letting autotrim work or doing it manually with the button on the stick.

An option would certainly help me I think with UK LAA.

Alan

 

[dynonsupport]

The trim on the stick always works and always overrides the auto trim.

However, once you are done manually trimming, the auto trim will go right back to trying to get the plane in trim. Manually trimming does not permanently disable the autotrim.