Pilot Operating Handbook
Cavalon
SECTION 7
SYSTEM DESCRIPTION
AutoGyro_POH_Cavalon 915iS
Revision 1.0 – Issue Date 08.MAY.2019
7-3
pressure, move the 4-way trim switch on the stick grip to aft. Note that this action will also
push the control stick forward. At full brake pressure the control stick will be maintained in
its full forward position.
Activation of the pre-rotator
The pre-rotator is activated as long as the respective switch on the control stick head is
depressed provided the following pre-conditions are met:
pneumatic mode selector set to FLIGHT
control stick in full forward position
trim pressure less than 3 bar
When activated the pneumatic clutch is activated and engine torque is transmitted through a
90° gearbox and drive to the pinion which is engaged by another small pneumatic actuator
into the geared ring of the rotor head. The drive pinion is sliding on a helical gear to provide
automatic lock-out in case of rotor RPM overrun. The pre rotator drives shafts feature sliding
splined elements to accommodate drive shafts length changes due to rotor head and
engine operational movement..
Activation of the pre-rotator in BRAKE position
The pre-rotator can be activated in BRAKE position to park the rotor blades fore-aft for taxi.
To do so, the pre-rotator switch and the overdrive/override switch in the cockpit panel have
to be pressed simultaneously. Avoid prolonged activation of the pre-rotator with rotor brake
engaged.
