MD Helicopters CSP-900RMM-2 Servicing And Maintenance Download

Page: 1710 / 2144

CSP-900RMM-2

MD Helicopters, Inc.

Rotorcraft Maintenance Manual

Page 4
Revision 35

67-00-00

Single pilot operation using the quick release
cyclic stick is prohibited.

C. Cyclic Stick Centering Device

The cyclic stick centering device, or centering
strap, is located on the front of the pilot's cyclic
stick assembly. The strap is bolted to the cyclic
stick at the top, and secured at the bottom, in
the stowed position, with a hook and loop
fastener. The strap is extended and aligned
with the centering placard on the instrument
panel directly in front of the cyclic stick. The
centering device is used to aid the pilot in
locating neutral cyclic stick position. Centering
the cyclic stick during engine start-up and
shut-down minimizes oscillatory loading of the
main rotor flexbeams.

D. Cyclic Stick Base

The cyclic stick base is attached to the
underside of the cockpit floor directly aft of the
cyclic stick opening. The cyclic base splits the
longitudinal and lateral cyclic stick inputs into
separate control paths.

The cyclic stick is attached to the longitudinal
bellcrank which is mounted in the lateral
bracket which pivots in the cyclic base. The
longitudinal bellcrank outputs longitudinal
cyclic stick inputs. The pivoting bracket
outputs the lateral cyclic stick inputs.

Incorporated into the pivoting bellcrank
bracket are secondary cyclic control stops.
Secondary cyclic control stops are machined as
part of the pivoting bracket and are not
adjustable.

E. Longitudinal and Lateral Trim Actuators

The longitudinal and lateral trim actuators
are located below the pilot's seat under the
cockpit floor panel. The trim actuators
compensate for control loads from the main
rotor system during flight. The actuators act
through spring cartridges to provide gradient
force from the centered position the pilot
selects.

The cyclic trim switch, located on top of the
cyclic stick grip, has five positions:

OFF at the center

FORWARD

AFT

LEFT

RIGHT

When the trim button is moved from the
spring-loaded OFF position to one of the four
trim directions, the trim actuators are
energized, and the force gradient springs are
repositioned to a new trim center.

Each trim actuator is an electrically energized
rotary actuator assembly installed in parallel
to the longitudinal or lateral control path. The
actuators are secured to a bracket that is
mounted to the forward fuselage substructure.

The cyclic trim gradient springs are linked to
the longitudinal and lateral linkages by dual
attachment bellcranks.

F. Longitudinal and Lateral Linkages

The longitudinal and lateral linkages are
located below the pilot's seat under the cockpit
floor, in the controls closet behind the pilot's
seat, in the cabin roof structure, and on the
upper deck. The longitudinal and lateral
linkages move with cyclic input from the cyclic
stick assembly to control rods, located in the
controls closet. The control rods in the controls
closet move linkages in the cabin roof struc
ture to the longitudinal and lateral hydraulic
servoactuators.

G. Longitudinal Controls Balance Spring

The longitudinal controls balance spring
cancels (balances) longitudinal control load
resulting from control component weight. The
longitudinal balance spring is attached by a
bracket to the cockpit sub-structure. The
balance spring connects to the longitudinal
controls through an attach cable to an
attachment clip. The attachment clip is
attached to the bottom connecting bolt of the
controls closet longitudinal control rod.

MD Helicopters CSP-900RMM-2, Servicing And Maintenance

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