REL button on the collective pitch stick grip. This
set knob to preselect the forward or aft ground
action makes possible a change in altitude.
speed to be maintained by the coupler. Friction
reduction built into the speed control permits the
By pressing the CPLR button, the pilot
engages the coupler and the ASE collective
pilot to make small changes in speed.
channel. The ASE must be on before engaging
the coupler. The push button marked HOVER
Drift Knob. --This knob is bar shaped. The
TRIM ENG can only be engaged when the CYC
pilot turns the drift set knob to preselect the
CPLR switch is in DOPP position. When
compensation for the helicopter's lateral drift
HOVER TRIM is engaged, hover trim control
about its ground track. The roll coupler mode will
transfers from the pilot to the crew member at
maintain this compensation. Full-scale sensitivity y
the hoist position. Hover trim allows the hoist
is low enough to allow the pilot to make small
operator to maneuver the helicopter fore and aft
changes in drift.
and port and starboard during hoisting or similar
operations. Hover trim control authority is limited
CC Trim Knob. --This knob is clover shaped.
to 11 4.5 knots of the speed established by the
The pilot turns the CG (center of gravity) trim
ASE speed control. The coupler release button,
knob to adjust the pitch in small increments both
marked CPLR REL, on each collective pitch lever
fore and aft. The CG trim signal is summed with
disengages the coupler portion of ASE. It also
that of the position sensor to maintain a
disengages the hover trim control. If the operator
preselected pitch.
desires to remain in a Doppler hover, the hover
trim may also be disengaged by cycling the cyclic
Cyclic Coupler Switch. --The cyclic coupler
coupler switch to OFF and then to DOPP.
switch selects the coupler mode of operation. The
Control knobs on the ASE panel have
switch has three-positions with the center position
definitive characteristic shapes that permit the
being OFF. When the switch is in the DOPP
pilot to identify them without looking at them.
position, information comes from the Doppler
Specific control knobs and their identifying shapes
radar. It also activates the Doppler mode of pitch
are described in the following paragraphs.
and roll coupler operation.
W i t h selection of the CABLE ANGLE
Altitude Set Knob. --This knob is cross
position, the sonar operator controls the pitch and
shaped. With basic ASE and the radar altitude
roll trim angle using the cable angle control panel.
(RDR ALT) coupler engaged, the helicopter can
This control allows for compensation of helicopter
accurately maintain any selected altitude from
drift over the sonar transducer.
0 to 200 feet. This mode of operation is
advantageous during hover operations, as the pilot
Altitude Coupler Switch. --The altitude
can vary altitude by rotating a single control.
coupler switch is used with the coupler button for
Various models of ASE have different scales
altitude reference. It is also a three-position
on the attitude set knob at different increments.
switch. The RDR ALT position engages the radar
(In one model, the scale runs from 0 to 1,000 feet
altitude mode for absolute altitude reference. The
with varying increments. In another model, the
CABLE ALT position engages the transducer
scale runs from 0 to 500 feet.) In the ASE
cable altitude for absolute altitude reference.
discussed in this chapter, the ALTITUDE control
When the CPLR button is depressed with either
scale is from 0 to 200 feet in 5-foot increments.
RDR ALT or CABLE ALT selected, the BAR
The 0 to 200 foot configuration offers accuracy
ALT mode automatically engages. The VERT
throughout the full range of travel of the control
ACCEL position of the altitude coupler switch
knob.
engages the vertical accelerometer mode to
eliminate collective pumping.
Yaw Trim Knob. --This knob is triangular
shaped. The pilot turns the yaw control knob to
trim the heading of the helicopter during flight.
CHANNEL MONITOR PANEL. --The
One rotation of the knob will turn the helicopter
channel monitor panel (fig. 8-34) is to the right
72 degrees. Each increment on the knob equals
of the pilot's seat. This panel contains four
1 degree of movement.
ON-OFF toggle switches across the top row and
four guarded switches marked HARDOVER
Ground Speed Set Knob. --This knob is an
across the middle of the panel. It also includes
indented circle. The pilot turns the ground speed
a meter select switch, and a vertical gyro switch.
8-38
