VAL Avionics NAV 2000 Guide d'installation télécharger pdf (Page 198)

Autopilot Servo Installation, Configuration, and Calibration

10-4 SkyView System Installation Guide - Revision R

provides sufficient torque to move and hold the flight controls with a minimum of slippage. A

diagram of servo torque versus mount position is shown on page 10-6.

The servo arm must not rotate even near to the point called OVER CENTER, the

point at which the primary aircraft control would “lock up”. Over center happens

when the angle between the servo arm and the attached push rod becomes so

great that the control system cannot drive against the servo arm. To protect

against this possibility, a Range of Motion Limiting Bracket is supplied with each

Dynon Avionics servo. These brackets are drilled so that they can be mounted at

different angles as required (18° intervals). The brackets are supplied for the

protection of the pilot, and we recommend that the Range of Motion Limiting

Bracket be installed to ensure that an OVER CENTER condition cannot occur.

During normal servo operation, the Range of Motion Limiting Bracket should never

be used. It is only intended for use as a safety mechanism in the SkyView Autopilot

system. When installing the Range of Motion Limiting Bracket, only use the

supplied screws. Using longer screws to install the bracket, you will penetrate and

damage the electronics.

Once a suitable mounting point for each servo has been determined, the next step is to

fabricate a mount for the servo to attach to the aircraft. Generally this will be a bracket made of

sheet metal or corner stock. Dynon recommends using 6061 T6 aluminum with a minimum

thickness of 0.050” for the best balance of strength to weight. When fabricating a mounting

bracket, refer to the servo dimensions below. Be sure to leave ample room for the arm and

attached linkage to move through a complete range of motion without interference.

In normal operation, autopilot servos can reach temperatures that can be very

uncomfortable to, and perhaps cause burns to unprotected skin. Thus, servos

should be mounted in an area, or in such a manner to prevent accidental skin

contact. If mounting the servo in an exposed area is necessary, a shroud should be

installed (that doesn’t restrict ventilation) that protects against accidental skin

contact with the servos.

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VAL Avionics NAV 2000 Guide d'installation Page 198