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between the crewmembers and allows
220 is not installed on the helicopter, MFD
the crew to communicate outside the helicopter through displays that normally provide HF radio
five communication radios. Radio selection and audio control or status will either have the
volume are controlled through the communication applicable bezel legends blanked or, if a
system control (CSC) panel (fig. 3-2). Radio selections legend i s present, the bezel w i l l not
are also made with the radio select switch located on function.
the pilot collective control head (fig. 3-3). The channel
and frequency to which each radio is tuned is displayed
on the RFD (fig. 3-1). Setting the desired frequencies 3-5. REMOTE FREQUENCY DISPLAY (RFD).
and modes into the radios is accomplished using the The RFD (fig. 3-1) is mounted in the upper center area
MFK and MFD. These procedures are described in of the instrument panel. The unit serves as a frequency
detail later in this section. Communication security for display for the five communication radios. The screen
the five radios is provided through two KY-58 units and displays the present channel number, frequency, and
one KY-75 unit. Communication security for the cipher or plain mode, and identifies to which radio each
five radios is provided through two KY-58 units for the crewmember is tuned for transmission. The RFD is tied
UHF and VHF radios; one KY-75 unit provided for the into the MFDs and the MFK through the MCPUs. Plain
HF radio and FM radio security is embedded into the or cipher modes are selected for the transceiver
AN/ARC-201D radio. All audio signals are transmitted currently set for transmitting by the pilot or CPG CIPH
and received through the crewmembers headsets. A switch (3) located on either side of the RFD screen.
ground crew ICS switch, labeled REMOTE ICS (fig. 3- The display screen (4) is a liquid crystal display that is
readable under all lighting conditions and is NVG
4), is located on the lower pedestal console and a compatible. Lighting of the display is controlled by a
receptacle is located on each pylon and in the forward BRT (brightness control) knob (6) located on the left
b a t t e r y compartment t o e n a b l e t h e crew t o side of the unit face. A TEST switch (5), located on the
communicate with maintenance and armament lower right portion of the RFD, has two functions:
personnel while the helicopter is on the ground. Refer changing input from one MCPU to another and
to figure 2-1 for location of communication system providing evidence of proper RFD display. In the event
antennas. of an MCPU failure, press the TEST switch to provide
3-3
TM 1-1520-248-10
alternate MCPU inputs to the RFD. This function is (4) Transmitting functions for the pilot and CPG
provided as a backup in the event of one MCPU failure. crew stations differ. The pilot has the option of
selecting a radio for transmit by use of the transmit
selector switch on his CSC panel (fig. 3-2) or the radio
3-6. COMMUNICATION SYSTEM CONTROL select switch on his collective control head (fig. 3-3).
(CSC) PANEL. The CPG can only select radios for transmit with the
transmit selector switch on his CSC panel.
a. Description. Two CSC panels are located in the
helicopter. The pilot CSC panel is located on the lower (5) Selecting a radio for transmit selects the
pedestal console and the CPG CSC panel is located on frequency displayed on the RFD screen (fig. 3-1) for
the extreme left side of the instrument panel. The CSC the corresponding radio number. Tuning the selector
panels are used in conjunction with the RFD (fig. 3-1). switch to 1, 2, 3, 4, or 5 sets the pilot to transmit on the
See figure 3-2 for a detailed description of CSC panel corresponding radio when either the cyclic transmit
controls. switch is pressed to the full detent or the floor mike
switch is pressed.
b. Controls and Function. Refer to figure 3-2 for
controls and functions of the CSC panel. (6) Radios may be selected for transmit using the
radio select switch on the pilot collective control head
c. Operation. During battery start, with the battery (fig. 3-3).
switch in BATT 1 position and the ESNTL BUS switch
in START, power is applied to the CSC units and FM-1. 3-7. CSC SWITCHES PILOT COLLECTIVE
(1) Power is supplied to the other four radios and CONTROL HEAD.
COMSEC units when one of the following occurs:
a. Description. There are two switches on the pilot
(a) The DC generator comes on line.
collective control head that are tied into the
(b) External DC or AC power is applied. communication system. These switches give the pilot
the ability to select radios without removing hands from
(c) When battery power only is used and the flight controls. These switches are the CHAN select
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(40)
