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davist(at)xsinet.co.za
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 Posted: Tue Oct 20, 2009 2:28 pm Post subject: Tru Trak Auto Pilot Servo |
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I have a Tru Trak servo installed on my RV-7 elevator control and am picking up a sudden large resistance to movement. After almost disassembling my entire elevator system to find the "binding" I traced the problem to the servo. There is of course an expected resistance when moving the controls but I suddenly experienced a loud grinding noise which was reminiscent of say a control surface rubbing over corrugated conduit. I also found that the extra resistance was only evident when the electrical connections were made (9 - pin plug inserted) The same effect could be obtained when 4 of the 9 pins were grounded against the side of the plug. Electrical current not applied. This was not evident throughout construction and has only just manifested itself. (now that I am ready for my maiden flight!) My friends RV with identical setup does not have the resistance that I am experiencing. Any thoughts anyone?
Trevor RV-7 Cape Town
[quote][b]
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n223rv(at)wolflakeairport
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| Posted: Tue Oct 20, 2009 3:29 pm Post subject: Tru Trak Auto Pilot Servo |
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Yes, pull the servo and send it in. You sure don't need the autopilot on your maiden flight... Isn't the first instance of hearing of issues with the servos....
Sent from my iPhone
On Oct 20, 2009, at 6:27 PM, "Trevor" <davist(at)xsinet.co.za (davist(at)xsinet.co.za)> wrote:
[quote] I have a Tru Trak servo installed on my RV-7 elevator control and am picking up a sudden large resistance to movement. After almost disassembling my entire elevator system to find the "binding" I traced the problem to the servo. There is of course an expected resistance when moving the controls but I suddenly experienced a loud grinding noise which was reminiscent of say a control surface rubbing over corrugated conduit. I also found that the extra resistance was only evident when the electrical connections were made (9 - pin plug inserted) The same effect could be obtained when 4 of the 9 pins were grounded against the side of the plug. Electrical current not applied. This was not evident throughout construction and has only just manifested itself. (now that I am ready for my maiden flight!) My friends RV with identical setup does not have the resistance that I am experiencing. Any thoughts anyone?
Trevor RV-7 Cape Town
[b]
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gyoung
Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas
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| Posted: Tue Oct 20, 2009 3:29 pm Post subject: Tru Trak Auto Pilot Servo |
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Disconnect the servo, remove/secure the pushrod and fly the airplane.
Regards,
Greg
Sent from my Blackberry
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lifeofreiley2003(at)yahoo
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| Posted: Wed Oct 21, 2009 6:42 am Post subject: Tru Trak Auto Pilot Servo |
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Hi Trevor,
Many builders have found interference with the F705 Bulkhead and the F789 Elevator Push Rod assembly. The problem has been the bottom or lower side of the tube rubbing on the bottom side of the cut out for the tube in the F705 Bulkhead (lower side of the cut out)... I would check this closely.
Build on...
Darrell
--- On Tue, 10/20/09, Trevor <davist(at)xsinet.co.za> wrote:
| Quote: | From: Trevor <davist(at)xsinet.co.za>
Subject: Tru Trak Auto Pilot Servo
To: "RV-List" <RV-List(at)matronics.com>
Date: Tuesday, October 20, 2009, 5:27 PM
I have a Tru Trak servo
installed on my RV-7
elevator control and am picking up a sudden large
resistance to movement.
After almost disassembling my entire elevator system to
find the "binding" I
traced the problem to the servo. There is of course
an
expected resistance when moving the controls but I
suddenly experienced a
loud grinding noise which was reminiscent of say a control
surface rubbing over
corrugated conduit. I also found that the extra
resistance was only
evident when the electrical connections were made (9 - pin
plug inserted)
The same effect could be obtained when 4 of the 9 pins were
grounded against the
side of the plug. Electrical current not
applied. This was not
evident throughout construction and has only just
manifested itself. (now
that I am ready for my maiden flight!) My friends RV
with identical setup
does not have the resistance that I am experiencing.
Any thoughts
anyone?
Trevor RV-7 Cape
Town
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http://www.matronics.com/Navigator?RV-List |
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