Dynon Avionics Cessna 172 F-S Instruction Manual

SkyView HDX System
Autopilot Servo Installation &
Maintenance Manual
Contains Instructions for Continued Airworthiness
Cessna Models 172 F-S
103526-000
Revision D
6/23/2020
Copyright © 2019 by Dynon Avionics, Inc.
Dynon Avionics grants third parties' permission to print this document

Contact Information
Dynon Avionics, Inc.
19825 141st Place NE
Woodinville, WA 98072
Phone: [phone]
Business Operations: 8:00 AM–5:00 PM (Pacific Time) Monday–Friday
Technical Support Operations: 7:00 AM–4:00 PM (Pacific Time) Monday–Friday
Email Sales: [email protected]
Email Support: [email protected]
Fax: [phone]
Web: www.dynoncertified.com
Copyright
©2019 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.

SkyView HDX System Autopilot Servo Installation & Maintenance Manual - Cessna Models 172 F-S, Revision D
Page | i
Revision History
REV
DATE
APPROVED
DESCRIPTION OF CHANGE
A
8/31/2018
ECO 312857
Initial Release
B
2/15/2019
ECO 317851
Improved organization and illustrations
C
10/25/2019
ECO 337637
•Re-titled doc to include Maintenance.
•Applied new document template, including adding new
Section 1: Introduction, to clarify use of document. This
content is boilerplate. All subsequent sections renumbered
•Removed part numbers of non-purchasable parts.
•Updated cable clamp material type (polyethylene for
aluminum) in Section 2: Materials.
•Updated illustrations in Section 7: Figures for better
readability/usability.
•Updated format and language of Mounting Bracketry
Installation sections for clarity and readability/usability.
•Updated format and language of Electrical Installation
section for better readability/usability.
D
6/23/20
CO 349445
Revision update due to online version of document having
incorrect torque values listed in Sec 6.1.3 step 17 and Sec
6.2.3 step 12

Page | ii
SkyView HDX System Autopilot Servo Installation & Maintenance Manual - Cessna Models 172 F-S, Revision D
References
DOCUMENT TITLE
103272-000 SkyView HDX Aircraft Flight Manual Supplement
102949-003 SkyView HDX Pilot’s User Guide Dynon Document
103272-000 SkyView HDX Aircraft Flight Manual Supplement
103000-000 Dynon Servo Shear Screw Replacement Instructions
43.13-1B Acceptable Methods, Techniques and Practices- Aircraft Inspection and Repair
43.13-2B Acceptable Methods, Techniques and Practices- Aircraft Alterations
Cessna Model 172 Maintenance Manual

SkyView HDX System Autopilot Servo Installation & Maintenance Manual - Cessna Models 172 F-S, Revision D
Page | iii
Table of Contents
1Introduction.............................................................................................. 1
1.1 Product Registration..................................................................................................... 1
1.2 Using this Manual......................................................................................................... 1
1.3 Manual Conventions..................................................................................................... 1
1.4 Installation Compliance ................................................................................................ 2
1.5 Installation Record........................................................................................................ 2
2Materials ................................................................................................... 3
2.1 Roll Servo Installation Materials ................................................................................... 3
2.2 Pitch Servo Installation Materials.................................................................................. 4
3Roll Servo Mounting Bracketry Installation ........................................... 6
3.1 Location and Access .................................................................................................... 6
3.2 Bracket Positioning and Temporary Installation ........................................................... 6
4Pitch Servo Mounting Bracketry Installation.......................................... 8
4.1 Location and Access .................................................................................................... 8
4.2 Base Bracket and Angle Brace Positioning and Temporary Installation....................... 8
4.3 Vertical Bracket Positioning and Temporary Installation............................................... 9
4.4 Mounting Bracket Final Assembly ................................................................................ 9
4.5 Sway Brace Final Assembly....................................................................................... 10
5Servo Electrical Wiring .......................................................................... 11
5.1 Wire Harness Preparation .......................................................................................... 11
5.2 Wire Harness Routing ................................................................................................ 11
5.3 Electrical Connection.................................................................................................. 12
6Continued Airworthiness....................................................................... 13
6.1 Roll Servo Removal and Installation........................................................................... 13
6.2 Pitch Servo Removal and Installation......................................................................... 16
6.3 Servo Calibration Procedure ...................................................................................... 18
6.4Servo Test Procedure................................................................................................. 18
7Figures.................................................................................................... 19
7.1 Roll Servo Parts and Assemblies ............................................................................... 19
7.2 Roll Servo Installation................................................................................................. 23
7.3 Pitch Servo Parts and Assemblies.............................................................................. 31

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SkyView HDX System Autopilot Servo Installation & Maintenance Manual - Cessna Models 172 F-S, Revision D
7.4 Pitch Servo Installation............................................................................................... 35

SkyView HDX System Autopilot Servo Installation & Maintenance Manual - Cessna Models 172 F-S, Revision D
Page | 1
1 Introduction
This manual provides instructions to install, configure, and maintain SkyView HDX System
autopilot servos in unmodified Cessna 172 Model Series F–S airplanes. Any airplane
configurations that require modifications to areas in the airplane where autopilot servos are
installed are not addressed in this manual.
The SkyView HDX System autopilot servo settings are available for download as a configuration
file that is loaded into the SkyView HDX display unit. The file configures the autopilot servo
performance settings to meet the applicable certification regulations. Configuration files are
available for download at www.dynon.aero/stcdocs.
1.1 Product Registration
Register your products at http://register.dynonavionics.com. Registering your SkyView HDX
equipment verifies ownership, expedites warranty claims, and allows Dynon Avionics to notify
you when product Service Bulletins and Technical Advisories are published. You can also sign
up to receive news and product announcements from Dynon Avionics. Dynon Avionics will not
share your contact information with third-parties or send you announcements without your
explicit consent.
1.2 Using this Manual
To reduce paper usage, Dynon Avionics does not provide a printed version of this manual.
However, Dynon Avionics grants permission to third parties to print this manual as necessary.
The most recent PDF version is available for download at www.dynon.aero/stcdocs. This
document is updated periodically, and it's important to use the most recent version when
installing SkyView HDX System components.
Dynon Avionics suggests keeping a PDF version of the manual on your smartphone, tablet, or
laptop computer while installing SkyView HDX System components. Using the manual
electronically allows you to view figures in color, perform keyword searches, and quickly navigate
the document.
1.3 Manual Conventions
This manual uses the following iconography:
Alerts reader to potential injury or equipment damage.
Alerts reader to important information.
Alerts reader to helpful tips or suggestions.

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SkyView HDX System Autopilot Servo Installation & Maintenance Manual - Cessna Models 172 F-S, Revision D
1.4 Installation Compliance
Airplanes on the AML meet a minimum required configuration for applicability of the STC.
However, some airplanes may have been modified, and consequently, it may be difficult to use
the information in this manual to completely substantiate the installation in compliance with the
STC. It is the installer's responsibility to make the final determination of applicability for each
individual airplane.
Prior to completing the installation, and before returning the aircraft to service, the installer must
complete and submit a completed FAA Form 337 Major Repair & Alteration (Airframe,
Powerplant, Propeller, or Appliance) to the appropriate FAA Flight Standards District Office. The
form must include the following:
•Description of the SkyView HDX System installation.
•Description of how the SkyView HDX System interfaces with existing equipment and
systems.
•Appropriately approved or acceptable data that demonstrates compliance.
Refer to AC 43.9-1E - Instructions for Completion of FAA Form 337 for additional information.
1.5 Installation Record
It is the responsibility of the mechanic or facility performing the installation to record where each
module of the SkyView HDX System has been installed in the airplane. This documentation
should be entered into airplane’s permanent record. Dynon Avionics provides a document
template to record this information. Download the document (103777-000 SkyView HDX System
Equipment Installation Record) at www.dynon.aero/stcdocs.

SkyView HDX System Autopilot Servo Installation & Maintenance Manual - Cessna Models 172 F-S, Revision D
Page | 3
2 Materials
This section provides information aboutthe materials used in installation of Roll and Pitch servos
in unmodified Cessna 172 Model Series F–S airplanes.
2.1 Roll Servo Installation Materials
The materials identified in Table 1 are required to install the Roll servo. Item numbers are used
as figure call-outs in Section 7.1 Roll Servo Parts and Assemblies and Section 7.2 Roll Servo
Installation.
Table 1: Roll Servo Installation Materials
ITEM
DYNON PART
DESCRIPTION
QTY
1
503406-000
SV42C SERVO ASSEMBLY
1
1-1
SERVO SHEAR SCREW
1
1-2
AN310-5 NUT CASTLE 5/16"-24
1
1-3
WASHER WAVE STL 5/16"
1
1-4
WASHER FLAT NYLON 5/16"
1
1-5
SERVO CAPSTAN
1
1-6
PHIL PAN HD SCREW #6-32 X 1/4"
4
1-7
MS35333-37 WASHER STAR STL #6
4
1-8
MS24665-210 COTTER PIN
1
1-9
BRIDLE CABLE GUARD
1
2
503508-000
SERVO MOUNTING KIT C172
*
2-1
503107-000 or -001
ROLL SERVO UPPER BRACKET C172
1
2-2
503108-000 or -001
ROLL SERVO LOWER BRACKET C172
1
3
103664-000
ROLL SERVO HARDWARE KIT C172
1
3-1
AN525-832R8 SCREW WASHER HEAD #8-32
10
3-2
AN960-08 WASHER FLAT STL #8
10
3-3
AN365-832A NUT LOCK STL #8-32
10
3-4
AN3H-3A BOLT HEX #10-32 DRILLED HEAD
4
3-5
MS35333-39 WASHER LOCK STAR INT STL #10
8
3-6
AN960-10 WASHER FLAT STL #10
8
4
503674-000
SERVO CAPSTAN ACCESSORY KIT 1/8"
1
4-1
AN365-1032A NUT LOCK STL #10-32
4
4-2
AN960-10-3 WASHER FLAT STL #10
4
4-3
AN3H-6A BOLT HEX #10-32 DRILLED HEAD
4
4-4
BRIDLE CABLE 1/16" DIA
1
4-5
SWAGE STOP FOR CABLE 1/16" DIA
2
4-6
BRIDLE CABLE CLAMP 1/8" 1/16" DIA
4
* Kit shared with pitch servo assembly.

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SkyView HDX System Autopilot Servo Installation & Maintenance Manual - Cessna Models 172 F-S, Revision D
2.2 Pitch Servo Installation Materials
The materials identified in Table 2 are required to install a Pitch servo. Item numbers are used
as figure call-outs in Section 7.3 Pitch Servo Parts and Assemblies and Section 7.4 Pitch Servo
Installation.
Table 2: Pitch Servo Installation Materials
ITEM
DYNON PART
DESCRIPTION
QTY
1
503406-000
SV42C SERVO ASSEMBLY
1
1-1
SERVO SHEAR SCREW
1
1-2
AN310-5 NUT CASTLE 5/16"-24
1
1-3
WASHER WAVE STL 5/16"
1
1-4
WASHER FLAT NYLON 5/16"
1
1-5
SERVO CAPSTAN
1
1-6
PHIL PAN HD SCREW #6-32 X 1/4"
4
1-7
MS35333-37 WASHER STAR STL #6
4
1-8
MS24665-210 COTTER PIN
1
1-9
BRIDLE CABLE GUARD
1
2
503508-000
SERVO MOUNTING KIT C172
*
2-3
503588-000
PITCH SERVO BASE BRACKET C172
1
2-4
503590-000
PITCH SERVO ANGLE BRACE C172
2
2-5
503589-000
PITCH SERVO VERTICAL BRACKET C172
1
2-6
503105-000
PITCH SERVO PULLEY BRACKET C172
1
2-7
MS20219-2 PULLEY PHENOLIC 1.75" OD BORE 0.25" ID
1
2-8
503329-000 or -001
PITCH SERVO LONG SWAY BRACE C172
1
2-9
503330-000
PITCH SERVO SMALL SWAY BRACE C172
1
3
103667-000
PITCH SERVO HARDWARE KIT C172
1
3-1
AN525-832R8 SCREW WASHER HEAD #8-32
29
3-2
AN960-08 WASHER FLAT STL #8
29
3-3
AN365-832A NUT LOCK STL #8-32
28
3-4
AN3H-3A BOLT HEX #10-32 DRILLED HEAD
4
3-5
MS35333-39 WASHER LOCK STAR INT STL #10
8
3-6
AN960-10 WASHER FLAT STL #10
8
3-7
AN4-11A BOLT HEX 1/4-28 1-5/32"
1
3-8
AN960-416 WASHER FLAT STL 1/4"
2
3-9
AN365-428A NUT LOCK STL #1/4-28
1
3-10
CCP-42 RIVET CHERRY N
4