Dynon Avionics RV-4/8 Pitch Kit User Manual
Page 5
DYNON AVIONICS
Servo Mounting Instructions – RV-4/8 Pitch Kit
4
101046-002 Rev F
Thread both large rod ends with jam nuts into the supplied 2.25" 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,
using the longer AN3H-11A bolt and capturing the washer sandwiched between the halves of the
bell crank. When installing in an RV-8 manufactured after September 2006, use the additional
supplied AN960-10 flat washer between the bell crank and rod end bearing to space the linkage
away from the bell crank, as shown on page 11.
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.
Due to the thickness of the brackets used with this servo mounting kit, the screws supplied with
the Range of Motion Limiting Bracket Kit will be too short. Either trim the stopper bracket until it
does not interfere with the thick servo bracket, or supply a set of longer screws following the
guidelines in the documentation of that kit. Do not install screws that penetrate the servo
enclosure more than 0.175”.
Your servo(s) and AP74/76 (if ordered) came with a CD containing the latest documentation for all
Dynon products (also available a
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. Vis
to view and contribute to the latest
version of these documents.
You can also visit
to discuss and share installation notes, pictures, and
suggestions with other builders.
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.