ROBINSON
MODEL R44
SECTION 7
SYSTEMS DESCRIPTION
REVISED: 10 MAR 2015 7-8
CONTROL FRICTION ADJUSTMENT
Cyclic and collective controls are equipped with adjustable
friction devices. The collective friction lever is located
near the aft end of the pilot’s collective. It is actuated aft
to increase friction and forward to release it.
The cyclic friction knob is located left of the cyclic center
post. Turning the knob clockwise applies friction to both
longitudinal and lateral cyclic.
CAUTION
Control friction must be used with caution
during flight. Excessive friction may make
the helicopter difficult to control.
The pedals actuate push-pull controls connected directly
to the tail rotor pitch control and do not incorporate any
friction devices.
ENGINE CONTROLS
A twist-grip throttle control is located on each collective
stick. The controls are interconnected and actuate the
throttle valve through a mechanical linkage. The engine
throttle is also correlated to collective inputs through a
mechanical linkage. When the collective is raised, the
throttle is opened and when the collective is lowered, the
throttle is closed.
The electronic engine governor makes minor throttle
adjustments by rotating the twist grip to maintain RPM
within power-on limits. Manual manipulation of the twist
grip is not typically required except during start up, shut
down, autorotation practice, and emergencies.
An overtravel spring located in the throttle linkage allows
the pilot to roll throttle off beyond the idle stop prior to a
ground contact (run-on) autorotation landing. This prevents
the throttle from opening when the collective is raised.
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