Ovation rudder trim

[Alan Maurer]

Mooney People,

On my 2008 ovation with the G1000 , the electric rudder trim switch is stuck....Is this likely to be a G1000 problem of the switch or the servo motor...

Any thoughts

thanks

Alan

[PaulM]

The Ovation maintenance manual (Includes schematics for ranges including  G1000 systems) can be found here:

https://mooneyspace.com/topic/40077-man161-rev-b-m20r/

The G1000 only shows the position, it doesn't control the servo. 

When you say "stuck" is that it only goes one direction?  or that it runs all of the time?.   

The switch is a split switch so it is unlikely to falsely provide power.. the way the circuit works is that power and ground is always provided to the switch.  If both halves are pressed to one side, then the ground goes to circuit A and power to B, the motor will run in that direction until a microswitch is tripped to stop the motor at the end of travel.   If pressed in the opposite direction then Power goes to A and ground to B and the motor will come off the limit switches and run the other way.

So depending on what stuck means it could be limit switches, motor, or panel switch.  

Now if the actual rudder trim isn't stuck but the graph showing it on the panel doesn't move.. that is a sensor issue and that is connected to the G1000. 

[Alan Maurer]

Hi Paul, Thank you. Pushing the split switch either right or left does not move the indicator on the MFD. Usually after landing, I set the rudder trim for right

rudder for the next take off.  I can keep the "ball" centered , of course, with the foot pedals.

Alan 

[PaulM]

Then you don't know if it is an actuator issue or the indicator issue. 

#1.. reset the trim breaker.  why not start easy.  (pull it and reset) 

You can usually run the trim full left or full right and tell via the aileron interconnect and rudder position that the trim has actually moved, or in flight by making the slip/skid marker go from side to side. 

The most definitive way is to look at the trim system.  From 27-40-02

E. Remove tailcone battery access cover (left side) and aft fiberglass belly panel to gain access to ruddertrim actuator assembly.

 I Think you can see/hear it from just opening the left battery access cover. 

run the trim system each way and see if the actuator moves.. if it doesn't.. then we start checking voltages to see if it is a control switch or limit switch, or motor issue. 

If it does move, then you check that the potentiometer is attached to the trim system, then we check the resistance with a meter.. it should change as the trim goes from side to side.  Lastly would be to look into the connection to the G1000.. 

 

Also make sure you have compiled with https://www.mooney.com/wp-content/uploads/2020/12/SIM20-124A.pdf If it affects your Serial#. 

[Alan Maurer]

Paul...Super helpful advice ...will check this

Alan

[Alan Maurer]

HI PAUL...GOT BACK FROM MEDICAL MEETING TRIP TO SAN FRANCISCO ANDWENT TO CHECK MOONEY. PUT ON BATTERY SWITCH  ON G1000 

AND ELECTRIC RUDDER TRIM SWITCH (ON GROUND)  AND INDICATOR RAN ALL THE WAY RIGHT AND LEFT....SO AN INTERMITTENT PROBLEM. 

ILL FLY THIS WEEKEND AND SEE IF I CAN KEEP THE BALL IN THE CENTER. 

STAY TUNED

ALAN 

[LANCECASPER]

2 hours ago, Alan Maurer said:

HI PAUL...GOT BACK FROM MEDICAL MEETING TRIP TO SAN FRANCISCO ANDWENT TO CHECK MOONEY. PUT ON BATTERY SWITCH  ON G1000 

AND ELECTRIC RUDDER TRIM SWITCH (ON GROUND)  AND INDICATOR RAN ALL THE WAY RIGHT AND LEFT....SO AN INTERMITTENT PROBLEM. 

ILL FLY THIS WEEKEND AND SEE IF I CAN KEEP THE BALL IN THE CENTER. 

STAY TUNED

ALAN 

You might look through the last few years logs to see if this has been complied with: https://www.mooney.com/wp-content/uploads/2020/12/SIM20-124A.pdf