Dynon Avionics RV-7 User Manual

Autopilot Servo Installation Guide

RV7, RV8, RV10 Roll

This product is not approved for installation in type certificated aircraft

Document 101046-003, Revision G

May, 2014

Copyright © 2009-2014 by Dynon Avionics, Inc.

Permission to print this this manual is granted to third parties

DYNON AVIONICS

Contact Information

Dynon Avionics, Inc.

19825 141st Place NE
Woodinville, WA 98072
Phone: [phone] - 8:00 AM – 5:00 PM (Pacific Time) Monday – Friday
Dynon Technical Support available 7:00 AM–4:00 PM (Pacific Time) Monday – Friday
Email: [e-mail]
Fax: [phone]

Dynon Avionics offers online sales, extensive support, and frequently updated information on its products via its
Internet sites:

www.dynonavionics.com –Dynon Avionics primary web site; including:
docs.dynonavionics.com – Current and archival documentation including Installation Guides.
downloads.dynonavionics.com – Software downloads.
support.dynonavionics.com – Support resources.
store.dynonavionics.com – Dynon’s secure online store for purchasing all Dynon products 24 hours a day.
wiki.dynonavionics.com – Dynon’s Documentation Wiki provides enhanced, extended, frequently updated online

documentation contributed by Dynon employees and customers.

forum.dynonavionics.com – Dynon’s Internet forum where Dynon customers can interact with each other and

Dynon Avionics. A key feature of the forum is that it allows the exchange of diagrams, photos, and other types of
files.

newsletter.dynonavionics.com – Dynon’s email newsletter.
blog.dynonavionics.com – Dynon’s blog where you can find new and interesting Dynon-related content.
register.dynonavionics.com – Register your Dynon Avionics product.
license.dynonavionics.com – Redeem certificates for navigation mapping software, synthetic vision, and other

features for license codes that add new functionality to your SkyView system.

Copyright

2008-2012 Dynon Avionics, Inc. All rights reserved. No part of this manual may be reproduced, copied, transmitted, disseminated or stored in
any storage medium, for any purpose without the express written permission of Dynon Avionics. Dynon Avionics hereby grants permission to
download a single copy of this manual and of any revision to this manual onto a hard drive or other electronic storage medium to be viewed for
personal use, provided that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice
and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.

Information in this document is subject to change without notice. Dynon Avionics reserves the right to change or improve its products and to
make changes in the content without obligation to notify any person or organization of such changes. Visit the Dynon Avionics website
(www.dynonavionics.com) for current updates and supplemental information concerning the use and operation of this and other Dynon
Avionics products.

Servo Mounting Instructions – RV-7/8/10 Roll Kit 1
101046-003 Rev G

DYNON AVIONICS

Kit Contents

Dynon Part #

QTY

Part Description

100836-000

2

Large Male Rod End

100870-001

1

RV7,8,9,10 Right Roll Bracket

100872-000

1

RV7,8,9,10 Right Support Bracket

100966-008

1

Aluminum Pushrod Tube - 3.0"

100975-002

2

AN315-4R Jam Nut

100976-011

2

AN365-1032A Nylon Insert Locknut

100977-000

2

AN970-3 Large Flat Washer

100978-003

7

AN960-10 Small Flat Washer

100979-002

3

MS35333-39 #10 Internal Star Washer

100981-000

3

AN3H-3A Bolt - 3/8"

100981-005

1

AN3H-10A Bolt - 1"

100981-012

1

AN3H-17A Bolt - 1 7/8"

100982-004

1

Aluminum Spacer - 0.875"

SERVO MOUNTING INSTRUCTIONS – RV-7/8/10 RIGHT WING
ROLL KIT

The RV-7/8/10 right wing roll servo mounting kit includes a right wing mounting bracket, right
wing support bracket, pushrod linkage, and most of the required fasteners to mount the servo and
properly link it to the aircraft control system. All Dynon-supplied parts are illustrated in dark grey to
distinguish them from existing aircraft hardware. The lower bell crank support bracket must be
removed to install the supplied servo mounting bracket. Fasteners used to secure the existing
brackets will be re-used to install the new Dynon brackets. It is up to the installer to determine if
these fasteners are suitable for re-use (not available from Dynon). With the mounting brackets
loosened/removed it is an ideal time to drill the aileron bell crank bracket per the dimensions in the
illustration.

The brackets that will replace the existing aircraft brackets are made of 4130 steel and plated per
QQP416 CAD - Type II Class II Yellow. They have been designed to meet or exceed the original
brackets in strength and corrosion resistance. Install the Dynon-supplied lower servo mounting
bracket in place with the previously removed original fasteners and install the vertical bolt as it was
in the original installation.

With the bracket in place, install the 2 AN3H-3A bolts, MS35333-39 star washers, and AN960-10
flat washers to secure the servo to the bracket per the drawing, noting the orientation of the servo
output arm. All AN bolts supplied by Dynon have drilled heads for use with safety wire.

Servo Mounting Instructions – RV-7/8/10 Roll Kit 2
101046-003 Rev G

DYNON AVIONICS

Neglecting to properly install and/or use Dynon autopilot hardware may
result in failures which could cause loss of aircraft control resulting in
aircraft damage, personal injury or death.

Install the support bracket to the other side of the servo using the same bolt stack-up. Secure it to
the upper bell crank support bracket using the existing fastener. With the servo in place, torque all
fasteners back to original installation specifications and add safety wire where needed.

With the servo installed, the linkage needs to be assembled. Refer to the illustration and follow
proper rod end installation techniques. Screw at least half of the threads on each rod end into the
push rod. To prevent the possibility of the servo arm going over-center, the servo arm
must not travel more than a total of +/-60º from neutral throughout the control system's range of
travel. The linkage should be installed as close to the Dynon recommendation as possible, as
changes will affect geometry. Dynon suggests installing the linkage at the outer-most hole of the
servo arm. Changing this location will affect servo torque output, servo arm travel, control surface
resolution, and the amount of force required to shear the safety screw, and should only be changed
if the installer has an understanding of these implications. See the diagram on the following page
which illustrates the linear travel and available force for each mount point on standard-arm servos.

Thread both large rod ends with jam nuts into the supplied 3.0" tube. Standard mounting of the
linkage to the servo arm will include the AN3H-10A bolt, AN970-3 large diameter flat washer (for
capturing the rod end bearing), 2 AN960-10 flat washers on each side of the servo arm itself, and
the AN365-1032A lock nut. The other end of the linkage will require the same type of stack-up, with
the addition of the 0.875" spacer and longer AN3H-17A bolt to secure to the drilled aileron bell
crank bracket.

The distance between the servo arm and the control system attachment point must allow for the
angle between the servo arm and the push rod to be at approximately 90º when the controls are at
neutral. Use the adjustability in the rod ends to achieve this, and then tighten the jam nuts to lock
the rod ends in place. Installers should always keep in mind the range of motion of the servo. Total
servo arm travel is limited, but verify the arm/linkage do not interfere with anything during the full
motion of the control stick. The built in control stops of the aircraft will limit the servo arm travel
when installed correctly. We recommend the use of the optional Range of Motion Limiting Bracket,
supplied with the servo to eliminate the chance of the servo arm going over-center. This bracket
should not be used as a normal stop; the aircraft's built-in stops should always be the primary range
limit.

Your servo(s) and AP74/76 (if ordered) came with a CD containing the latest documentation for all
Dynon products (also available at dynonavionics.com). Please read through that documentation to
understand the wiring and configuration process for your Autopilot system. We also maintain a
collaborative set of this documentation, which is often updated with new information by both
Dynon and fellow builders. Visit wiki.dynonavionics.com to view and contribute to the latest
version of these documents.

You can also visit forum.dynonavionics.com to discuss and share installation notes, pictures, and
suggestions with other builders.

Servo Mounting Instructions – RV-7/8/10 Roll Kit 3
101046-003 Rev G