Pre-Rotator Upper Engagement; Rotor Brake System; Rotor Flight Control; Pitch Trim System / Rotor Brake - AUTO GYRO Cavalon Maintenance Manual

63-11-30

Pre-rotator Upper Engagement

The pre-rotator upper engagement comprises a drive pinion with bearing, which is engaged by a small
pneumatic actuator into the geared ring / sprocket wheel of the rotor head. The drive pinion is sliding on
a helical gear to provide automatic lock-out in case of rotor RPM overrun.
63-51-00

Rotor Brake System

The rotor brake system consists of a brake pad mounted to a bracket which is hinged to the rotor head
bridge. A second brake pad is mounted in forward position which will contact the sprocket wheel only
when in full flat / level (stick fully forward) position. With the pneumatic mode selector in BRAKE position
the operation of the pneumatic trim actuator is reversed so that increased pressure causes the actuator
to push the rotor head up (or level) and presses a brake pad against the rotor head disc. In order to
increase brake pressure, move the 4-way trim switch to aft. Note that this action will also push the control
stick forward which will push the sprocket wheel against the forward brake pad. At full brake pressure
the control stick will be maintained in its full forward position while aft and forward brake pads provide
braking action.
Due to its main function the pneumatic brake/trim actuator/cylinder itself is allocated to
Trim.
CHAPTER 64-66 - N/A
CHAPTER 67 - ROTOR FLIGHT CONTROL
Rotor flight control comprises of control stick, a control tube running
horizontally along the bottom of the fuselage, and push-pull control
cables which are routed horizontally along the centre channel, then run
vertically up the cabin side of the rear bulkhead to the mast and
connected to the rotor head bridge.
Pitch and roll of the gyroplane are controlled by tilting the complete rotor
head by means of the control stick. Control input is transferred via
torsion tube and linkage running below the seats to the base link and
from there to the rotor head via push-pull control cables.
The control stick head is ergonomically shaped to fit the pilot's right hand
and features control buttons for radio transmission (1), a four-way trim
function (2), and activation of the pre-rotator (3).
67-05-00

Pitch Trim System / Rotor Brake

The Pitch Trim System comprises of a 4-way beep trim switch (2) /
"Chinese Hat" at the flight control stick and the pitch trim / brake
pneumatic actuator. Pneumatic control is allocated to and described in
CHAPTER 36. Components related to the rotor brake are allocated to
Trimming is affected by varying trim pressure in the pneumatic trim actuator which is installed in parallel
with the rotor head tilt for pitch control. Aft or nose-up trimming activates the electrical compressor and
increases trim pressure, causing the actuator to contract, and tilting the rotor disc aft. Forward trimming
opens the pressure relief valve to reduce trim pressure and allows the rotor disc to flatten, due to the
spindle head offset and the gyroplane's weight. The actual trim condition is indicated on the trim/brake
pressure gauge in the centre panel of the cockpit.
67-06-00

Roll Trim System

Lateral/roll trim works accordingly, using a lateral pneumatic trim cylinder. Lateral trim condition is
indicated by a self-dimming LED bar on the instrument panel.
AMM-CV-915iS/916iS-EN-
C-2023-12
Aircraft
Maintenance Manual
Part C – System Description Section
(Chapter 21 – 90)
AutoGyro
Cavalon 915 iS / 916 iS
67-05-00 Pitch
Control stick head
1 – Radio transmission
2 – Trim switch
3 – Pre-rotator
63-51-00 Rotor Brake System.
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