cushion vanes and bow thrusters. Four switches on the
energized to supply adequate hydraulic pressure to the
hydraulic actuators. The actuator movement closes all
C&C keyboard allow the engineer to control these
four cushion vanes and takes the craft off cushion.
vanes. The 16 vanes in the system are adjustable through
any degree of rotation ordered by the operator.
SELECTOR SWITCHES. Four momentary-
contact push-button selector switches located on the
OPERATING MECHANISM.-- The purpose of
C&C keyboard allow the cushion vanes to be opened
the cushion vanes operating mechanism is to open and
and closed from the engineer station. These switches do
close the cushion vanes. Each mechanism consists of
not use power from the CSEP.
four bellcrank assemblies, four torque tubes, and one
actuator. Hydraulic pressure supplied to the actuator,
INDICATORS.-- The following indicators are
through the 4-way, 3-position, solenoid-operated valve,
provided to inform the operator of the status of the
causes the bellcranks to turn and operate the cushion
cushion vanes:
vanes.
Port and starboard cushion vane position (bar
EMERGENCY CUSHION DUMP SWITCH.--
graph)
The emergency cushion dump switch allows the
Port and starboard cushion vane digital position
operator to dump the craft air cushion during an
emergency stop. When the switch is depressed, all four
The operator uses this information to achieve the
4-way, 3-position, solenoid-operated valves are
most effective movement of the craft.
Figure 7-12.--Command and control (C&C) keyboard.
7-10
