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disengagement, trim feel, radio and intercommunications,
and flight modes symbology. The pilot grip also
has a remote transmitter selector switch for radio selection.
These switches will be described in more detail
with their associated systems.
2.37.2 Collective Sticks. The collective sticks in both
crew stations (fig 2-26) provide the crew with a means
of adjusting pitch angle of the main rotor blades and
fuel flow metering requirements of the gas generator
turbine. Each collective stick has an engine chop collar
just aft of the collective stick switch box (see Section III)
to permit both engines to be reduced to idle without
moving the PWR levers. A switch panel at the end of
each collective stick contains a searchlight (SRCH LT)
switch, an extend-retract (EXT-RET) momentary
searchlight switch, a wing stores jettison guarded button
(ST JTSN), a NVS switch, a BRSIT HMD/PLRT
switch, and a radio frequency override (RF OVRD)
switch. The RF OVRD switch is nonfunctional. The
CPG collective stick has a BUCS select trigger switch.
These switches will be discussed in more detail with
their respective systems. A twist-type friction adjustment
is installed on the collective assembly to prevent
the collective stick from creeping during flight.
2.37.3 Directional Control Pedals. The directional
control pedals, one set in each crew station, provide for
helicopter movement about the yaw axis. Both sets of
pedals are adjusted by applying foot pressure and moving
a pedal adjust quick-release lever. Pressing the upper
portion of either pedal actuates a master brake cylinder
which delivers hydraulic power to a brake disc at
the respective main landing gear wheel. Section I contains
descriptions of the main landing gear and brake
system.
2-42
TM 1-1520-238-10
Figure 2-25. Primary Flight Control System
2-43
TM 1-1520-238-10
Figure 2-26. Cyclic Stick Grip and Collective Stick Controls
2-44
TM 1-1520-238-10
2.37.4 Trim Feel.
Use of the pilot FORCE TRIM REL
switch in the force trim off position
with the helicopter on the ground is
not authorized. Inflight operation
with the pilot FORCE TRIM REL
switch in the force trim off position is
authorized when briefed and the
force trim off selection is acknowledged
by both crewmembers.
Either crewmember can trim the cyclic and pedal controls.
A lateral, longitudinal, and directional trim feel
magnetic brake and spring assembly is incorporated
into each control system. Setting the pilot FORCE
TRIM REL switch to the on position will engage the
magnetic brakes in the longitudinal, lateral, and directional
flight controls. The spring assemblies will hold
the cyclic stick and directional pedals in trim. Movement
of the cyclic or directional controls, by either the
pilot or CPG, with FORCE TRIM REL switch on, will
cause the spring assemblies to compress and provide
feel to the controls. When control pressure is released,
the controls will return to their trimmed position. Retrimming
is accomplished by a TRIM pushbutton on
the CPG cyclic stick or by a FORCE TRIM REL switch
on the pilot cyclic stick grip. Pressing the button or
pressing up on the switch releases the magnetic brake
and allows the springs to travel to the new control position.
Additionally, this action also allows the SAS actuators
to recenter, if necessary. Releasing the button
or switch will then allow the magnetic brake to engage
and hold the springs at the new position. The pilot may
press the FORCE TRIM REL switch to the full down
position to disable trim feel entirely.
For the CPG, trim feel is lost in the affected axis
when the respective SPAD shear pin is broken or if mechanical
linkage severance has occurred between the
pilot and CPG stations.
With the pilot FORCE TRIM REL switch in the down
position, the ATTD/HOVER HOLD and SAS actuator
centering capabilities of the DASE are inoperative. The
capabilities will return when the switch is returned to
the center position. The full down position of the pilot
FORCE TRIM REL switch may be used momentarily
to unlatch the magnetic latch of the ATTD/HOVER
HOLD switch on the ASE control panel (fig 2-27). The
DASE capabilities of the pilot FORCE TRIM REL
switch remain unaffected in the event of a trim system
failure such as with the magnetic brake or spring capsule.
Trim feel is operable throughout all ranges of cyclic
stick or pedal travel. The trim system receives 28
vdc from the emergency dc bus through the TRIM circuit
breaker on the pilot overhead circuit breaker panel.
　
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