Trio-avionics EZ Altitude Control Manuel d'utilisateur télécharger pdf (Page 13)

6.0 Servo Installation Setup

The servo unit incorporates important safety features:

• The internal gears are pulled into the engaged position by an electric solenoid.

When the gears are not engaged, the output crank arm rotates freely and the

elevator controls can be operated normally without friction. When the servo is

engaged, the solenoid pulls the gears into place so the servo has control of the

elevators. Disengaging the servo allows free movement of the elevator controls.

• The servo is engaged and disengaged by pressing the LCD push switch. The servo

is engaged in any mode other than the READY mode. There is also a recommended

remote SERVO DISCONNECT switch on the control stick (or other remote location).

Installation of a remote switch is highly recommended

, as it allows an immediate way

to disengage the servo - even in heavy turbulence, when it may be difficult to operate

the LCD button. In addition, such a switch will allow for the PILOT COMMAND

STEERING feature (Section 3.3) and the VS and airspeed capture features (EZ-2 &

EZ-3, see section 8).

• The servo also employs a clutch, which allows the pilot to override the servo by

applying moderate force to the control stick. Even though the solenoid will hold the

gears in place, the clutch will then slip and allow the control surfaces to move. In the

event of strong turbulence, or an altitude anomaly, the pilot can thus override the

servo to control the airplane. In such an instance, the servo should be disengaged

as soon as possible.

NOTE: The clutch function does not rely on a shear pin failure mechanism as is employed on

some other popular autopilot servos. Activation of the “clutch” function in no way damages the

servo drive system although prolonged operation in this condition should be avoided.

6.1 Installing the Servo

Begin by looking for a point on your elevator bell crank, control pushrod or cable where

pushing or pulling the elevator control linkage a distance of 1.5 to 2.4 inches will do the

job. Then find a place to mount the servo nearby to accomplish this by means of the

pushrod. You will mount the servo and pushrod so that the elevator is in a neutral

position when the servo crank arm is at mid position. That’s it, aside from carefully

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Trio-avionics EZ Altitude Control Manuel d'utilisateur Page 13