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Dynon Avionics SkyView HDX Installation & Maintenance Manual

For cessna model 172 f-s
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SkyView
Autopilot Servo Installation & Maintenance Manual
Cessna Model 172 F-S
Includes Instructions for Continued Airworthiness (ICA)
STC SA02594SE
103526-000
Copyright © 2025 by Dynon Avionics, Inc.
Dynon grants third parties' permission to print this document.
SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S, 1/17/2025
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  • Page 1 Includes Instructions for Continued Airworthiness (ICA) STC SA02594SE 103526-000 Copyright © 2025 by Dynon Avionics, Inc. Dynon grants third parties’ permission to print this document. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S, 1/17/2025 Page | i...

  • Page 2: Contact Information

    Visit the Dynon Avionics website (dynon.com) for current updates and supplemental information concerning the use and operation of this and other Dynon Avionics products. Page | ii SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S, 1/17/2025...

  • Page 3: Revision History

    • Adding Section 12: Appendix 1: Servo Capstan Removal / Installation. 1/17/2025 Updated per Fixed part number typo in Table 2. 395947 Minor Change Agreement SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S, 1/17/2025 Page | iii...

  • Page 4: Table Of Contents

    Abnormal Operation ....................10-2 10.3 Servo Slip Messages ....................10-2 Servo Maintenance ................11-1 11.1 Service ........................11-1 11.2 Calibration Procedure ....................11-1 Page | iv Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 5 Roll Servo Removal and Replacement ..............11-5 11.9 Pitch Servo Removal and Replacement ..............11-8 Appendix 1: Servo Capstan Removal / Installation Figure ....12-1 SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S, 1/17/2025 Page | v...
  • Page 6 This page intentionally left blank. Page | vi Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...

  • Page 7: Introduction

    Federal Aviation Regulation (FAR) 14 CFR § 23.1529 and 14 CFR 23 Appendix G. This document does not provide ICA for the SkyView HDX system. That information is provided in the SkyView HDX General Maintenance Manual document at dynoncertified.com/docs.

  • Page 8: Manual Iconography

    104003-000 D30 Installation & Maintenance Manual, current revision • 103221-000 SkyView HDX General Maintenance Manual, current revision • 103488-000 SkyView HDX Wiring Diagram - Single Engine, current revision • 103272-000 SkyView HDX Airplane Flight Manual Supplement, current revision • 103777-000 SkyView HDX System Equipment Installation Record, current revision •...

  • Page 9: Product Delivery

    This documentation should be entered into airplane’s permanent record. Dynon provides a document template to record this information. Download the SkyView HDX Equipment Installation Record document at dynoncertified.com/docs. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S, 1/17/2025 Page | 1-3...
  • Page 10 This page intentionally left blank. Page | 1-4 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...

  • Page 11: Airworthiness Limitations

    Airworthiness Limitations For any Airworthiness Limitations associated with the installation of SkyView Autopilot servos, see the SkyView HDX General Maintenance Manual document at dynoncertified.com/docs. It is the principal ICA document for the SkyView HDX system. SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 12 This page intentionally left blank. Page | 2-2 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...

  • Page 13: Basic Control And Operation

    Basic Control and Operation Pilots interact with all Autopilot functions through a SkyView HDX display unit. No special operating procedures are required for using the Autopilot. Control descriptions and detailed operating procedures are found in the SkyView HDX Airplane Flight Manual Supplement document at dynoncertified.com/docs.
  • Page 14 This page intentionally left blank. Page | 3-2 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...

  • Page 15: Installation Compliance

    (i.e., methods, component locations, wiring harness routing, etc.) before installation activities begin. This will help avoid potential rework should any part of the installation be found non-compliant. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025...
  • Page 16 This page intentionally left blank. Page | 4-2 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...

  • Page 17: Control Cable Verification

    If the airplane's original control cables are outside this specification, contact Dynon Technical Support for a resolution. Out-of-specification control cables can cause cable clamps to slip under load. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025...
  • Page 18 This page intentionally left blank. Page | 5-2 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...

  • Page 19: Materials

    MS35333-39 INT TOOTH STAR WASHER #10 AN960-10 FLAT WASHER #10 AN525-832R8 WASH HEAD SCREW #8-32 AN960-08 FLAT WASHER #8 AN365-832A LOCK NUT LOCK #8-32 SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 6-1...
  • Page 20 ST2-2 STOP SWAGE, 1/16" CABLE Items without Dynon part numbers are parts packaged in a kit. * Packaged in a kit, but item also sold separately. Page | 6-2 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 21 AN3H-3A HEX BOLT #10-32, 15/32" L, DRILLED HEAD MS35333-39 INT TOOTH STAR WASHER #10 AN960-10 FLAT WASHER #10 AN4-11A HEX BOLT #1/4-28, 1-5/32" L, AN960-416 FLAT WASHER 1/4" SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 6-3...
  • Page 22 BRIDLE CABLE CLAMP, 1/8", 1/16" BRIDLE CABLE, 1/16" ST2-2 STOP SWAGE, 1/16" CABLE Items without Dynon part numbers are parts packaged in a kit. Page | 6-4 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...

  • Page 23: Initial Servo And Bracketry Installation

    Always deburr drilled holes. Unless otherwise specified, torque all fasteners per specifications in AC 43.13-1B, Table 7-1. Include specified friction drag value when torquing screws. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 7-1...
  • Page 24 Figure 1: Roll Servo Location Page | 7-2 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 25 Figure 2: Roll Servo Complete Installation SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 7-3...
  • Page 26 To install the roll servo and bracketry: Remove capstan from roll servo (see Section 11.5). DO NOT remove shear screw from servo disc! Page | 7-4 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 27 Figure 4: Attaching Upper and Lower Brackets to Roll Servo Cut bridle cables to length and assemble, as shown in Figure Figure 5: Preparing Bridle Cable SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 7-5...
  • Page 28 Securing the bridle cable to the capstan's grooves with tape prevents it from unraveling when handling. Figure 6: Wrapping Bridle Cable and Attaching Capstan to Roll Servo Page | 7-6 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 29 Prepare upper and lower wing skins for roll servo brackets, as shown in Figure 7 Figure Figure 7: Preparing Upper Wing Skin SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 7-7...
  • Page 30 Figure 8: Preparing Lower Wing Skin Loosen hardware that secures upper bracket to roll servo. Page | 7-8 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 31 10. After insertion, slide roll servo assembly inboard until brackets contact flange of inboard WS100 rib, and then raise upper bracket until bracket contacts upper rear spar flange. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S...
  • Page 32 Install temporary fasteners while drilling as needed. 14. Drill up to #18 holes through wing skins and upper and lower brackets. Remove temporary fasteners while drilling as needed. Page | 7-10 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 33 Secure ailerons and/or yoke in center of travel. Make sure aileron crossover cable in area where bridle cable clamps will attach is clean and free of dirt and grease. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025...
  • Page 34 • Capstan's swage engagement hole remains in the 6 'o' clock position. • Clamps are located as shown in Figure • Clamps are positioned to avoid contacting any structure. Page | 7-12 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 35 10. Use provided clips to safety wire bridle cable turnbuckle halves and barrel. 11. Permanently attach capstan to roll servo (see Section 11.5). SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025...
  • Page 36 14. Adjust cable guard and/or cable guard bracket as needed so cables do not contact cable guard. To check the roll servo installation: Release ailerons and/or yoke. Page | 7-14 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...

  • Page 37: Pitch Servo Installation

    Always deburr drilled holes. Unless otherwise specified, torque all fasteners per specifications in AC 43.13-1B, Table 7-1. Include specified friction drag value when torquing screws. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 7-15...
  • Page 38 Figure 14: Pitch Servo Location Page | 7-16 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 39 Figure 15: Pitch Servo Complete Installation SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 7-17...
  • Page 40 It is critical to align base bracket, so it is perpendicular to the FS108 bulkhead and the angle braces do not contact the existing cable pulley brackets. Page | 7-18 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 41 Figure 17: Positioning Base and Angle Brackets SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 7-19...
  • Page 42 Temporarily fasten angle brackets to base bracket, as shown in Figure Using pilot holes in brackets, match drill #40 holes through FS108 bulkhead. Page | 7-20 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 43 19. Do not fully tighten hardware yet. Figure 19: Attaching Pitch Servo and Idler Pulley to Vertical Bracket Place servo assembly on base bracket. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 7-21...
  • Page 44 0.25" spacing from elevator control cable pulleys mounted to FS108 bulkhead (see Figure 20). Figure 20: Positioning Servo Assembly Longitudinally on Base Bracket Page | 7-22 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 45 13. Attach vertical bracket to base bracket with temporary fasteners. 14. Drill up to #18 holes through vertical and base bracket, removing temporary fasteners as needed. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025...
  • Page 46 19. Make sure bracket assembly is in correct position and temporarily fasten to fuselage skin. 20. Drill up to #30 holes through angle brackets and FS108 bulkhead, removing temporary fasteners as needed. Page | 7-24 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 47 22. Permanently attach bracket assembly to fuselage skin and FS180 bulkhead (see Figure 23). 23. Temporarily attach pitch servo to vertical bracket (see Figure 19). SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 7-25...
  • Page 48 24. Temporarily attach short brace to pitch servo, as shown in Figure Figure 24: Attaching Short and Long Brace to Pitch Servo Page | 7-26 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 49 32. Remove pitch servo from aircraft. To connect the pitch servo to the lower elevator control cable: Secure elevator and/or yoke in center of travel. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 7-27...
  • Page 50 Securing the bridle cable to the capstan's grooves with tape prevents it from unraveling when handling. Figure 26: Wrapping Bridle Cable and Attaching Capstan to Pitch Servo Page | 7-28 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 51 12. If cable guard interferes with bridle cable, adjust cable guard position (see Section 11.6 for instructions), and then repeat Step 11. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 7-29...
  • Page 52 • Swage engagement hole is in the 3 'o' clock position. • Position of bridle cable clamps closely matches Figure • Bridle cable tension has not changed. Page | 7-30 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...

  • Page 53: Servo Electrical Connection

    Yaw Damper button is installed. After electrically connecting the Autopilot servos, perform the Servo Calibration Procedure (see Section 11.2 for instructions). SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 8-1...

  • Page 54: Custom Wire Harness Preparation

    Table 3 wire/pin connection guidance. Dynon harness standard is to connect servo wires to a D9 male connector with threaded jack nuts. (See the SkyView HDX Wiring Diagram - Single Engine and SkyView HDX System Installation Manual documents at dynoncertified.com/docs for additional electrical installation information.)

  • Page 55: Electric Trim Control

    Electric Trim Control Existing pitch trim motors certified for the airplane can be controlled through the SkyView HDX Autopilot system. Such trim motors must operate on 10–30 Volts with a maximum current draw of 5 Amps. This includes trim motors with or without a clutch.
  • Page 56 This page intentionally left blank. Page | 9-2 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...

  • Page 57: Servo Troubleshooting

    General Maintenance Manual for information about troubleshooting the SkyView Autopilot system interface. 10.1 Servos Offline Messages Condition: One or more of the following messages appear on SkyView HDX display unit: PITCH SERVO OFFLINE ROLL SERVO OFFLINE If all three messages annunciate: Verify master power is ON.

  • Page 58: Abnormal Operation

    Support to request a 102991-000 Shear Screw Replacement Kit. 10.3 Servo Slip Messages Condition: One or more of the following messages appear and persist on SkyView HDX display unit: PITCH SERVO SLIP ROLL SERVO SLIP The momentary appearance of SERVO SLIP messages is expected due to certain weather conditions during autopilot operation.

  • Page 59: Servo Maintenance

    • V-speeds correctly entered in SkyView HDX. (See the SkyView HDX System Installation Manual document for instructions.) To make a new servo appear on the SkyView HDX display, configure the SkyView Network (SYSTEM SETUP > NETWORK SETUP > CONFIGURE). (See the SkyView HDX System Installation Manual document for instructions.)

  • Page 60: Test Procedure

    Normal Open (PBNO). Press cancel below to return to the servo calibration menu." If the servo calibration procedure is not successful, inspect the button and servo wiring. (See the 103261-000 SkyView HDX System Installation Manual document for instructions.) If button type and wiring is correct, call Dynon Technical Support.

  • Page 61: Servo Capstan Removal And Attachment

    Mark position of castle nut in relation to servo shaft, and then remove castle nut from servo shaft. Remove wave washer from servo shaft. Removed nylon washer from servo shaft. Remove capstan from servo shaft. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 11-3...

  • Page 62: Cable Guard Adjustment

    Rotate capstan guard to correct position. Secure capstan guard to servo with screws and star washers. Re-attach capstan to servo shaft (see Section 11.5 for instructions). Page | 11-4 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...

  • Page 63: Shear Screw Replacement

    Unfasten hardware that secures cable guard to cable guard bracket (see Figure 13), and then unfasten hardware that secures cable guard bracket to roll servo (see Figure 13). Retain hardware for installation. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 11-5...
  • Page 64 If clamp gap measurements do not meet criteria above, measure diameter of control cable, and then contact Dynon Technical Support for a resolution. Out-of-specification cable clamps can slip under load. Page | 11-6 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 65 • Bridle cable tension has not changed. After all Autopilot servos have been serviced, perform servo calibration procedure (see Section 11.2 for instructions). SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 11-7...

  • Page 66: Pitch Servo Removal And Replacement

    Secure elevator and/or yoke in center of travel. Make sure lower elevator control cable in area where bridle cable clamps will attach is clean and free of dirt and grease. Page | 11-8 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...
  • Page 67 • Control is smooth throughout (i.e., no grinding, rubbing, or roughness). • Bridle cable clamps do not contact any structures during entire travel. • Capstan never rotates more than 150 degrees in either direction from neutral. SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025...
  • Page 68 • Bridle cable tension has not changed. After all Autopilot servos have been serviced, perform servo calibration procedure (see Section 11.2 for instructions). Page | 11-10 Cessna Model 172 F-S 1/17/2025 SkyView HDX - Autopilot Servo Installation & Maintenance Manual,...

  • Page 69: Appendix 1: Servo Capstan Removal / Installation Figure

    12 Appendix 1: Servo Capstan Removal / Installation Figure Figure 28: Exploded View of a Typical Servo Capstan Assembly SkyView HDX - Autopilot Servo Installation & Maintenance Manual, Cessna Model 172 F-S 1/17/2025 Page | 12-1...

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