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is protected by the VDU circuit breaker located on the
pilot overhead circuit breaker panel. The VDU is not
monitored by FD/LS. The function of each switch is described
in table 4-2. Figure 4-2. Video Display Unit
Change 4 4-5
TM 1-1520-238-10
Table 4-2. Video Display Unit Control/Indicator Functions
Switch/
Control
BRT
ROLL
PITCH
CTRS
Position
OFF
TEST
PLT
CPG
Function
Removes all power to the VDU.
Displays a vertically oriented test pattern.
Displays pilot selected video.
Displays CPG selected video.
Adjusts display brightness.
Adjusts roll trim on the symbolic horizon displayed in the transition and cruise
modes of flight symbology.
Adjusts the pitch trim on the symbolic horizon displayed in the transition and
cruise modes of flight symbology.
Adjusts display contrast in PLT and CPG modes.
4.5 VIDEO RECORDER SUBSYSTEM (VRS).
The VFtS consists of an airborne video recorder, located
in the left side of the aft avionics bay (fig 2-2), and the
video recorder control panel, placarded RECORDER
(fig 4-3), located in the CPG left console (fig 2-12). The
VRS has the capability of recording up to 72 minutes of
either pilot or CPG selected video. Capability exists for
playback onboard the helicopter for real time damage
assessment and reconnaissance. The VRS receives 115
vac from the No. 2 essential ac bus through the RCDR
circuit breaker on the CPG No.1 circuit breaker panel.
The VRS is not monitored by FD/LS. The video tape recorded
onboard the helicopter requires a special video
playback unit to view the imagery off the helicopter.
The video recorder control panel control/indicator functions
are discribed in table 4-3.
Figure 43. Video Recorder Subsystem Control
Panel
4-6
TM 1-1520-238-10
Table 43. Video Recorder Control Panel/Indicator Functions
Control/
Indicator
MODE
Position Function
OFF Removes all power to the VRS; commands the recorder to unthread the video tape
cassette.
STBY Enables power to the VRS and commands the recorder to thread the video tape
cassette.
REC Places the recorder in the record mode. Actual recording starts or stops when the
VID RCD switch on the ORT RHG is pressed.
PLAY Places the recorder in the play mode and activates the PLAY rotary switch for
further commands. Automatically commands the symbol generator to display the
recorder video on the CPG displays.
RWND Commands the recorder to rewind the video tape cassette; once commanded, the
recorder will completely rewind the video tape prior to following any further
commands.
PLAY
WENT
VIDEO
MIN
The PLAY switch is active only when the MODE switch is in the PLAY position.
FAST REV Commands the recorder to fast reverse.
REV Plays back the recorded video in reverse on the CPG displays at normal speed.
STILL Freezes the video image.
FWD Plays back the recorded video in forward on the CPG displays at normal speed.
FAST FWD Fast forwards the recorder.
A pushbutton switch which when pressed will place an event mark (EMK) and
audio tone on the video tape.
CPG Selects the CPG displayed video to be sent to the recorder when recording.
PLT Selects the pilot displayed video to be sent to the recorder when recording.
Tape used indicator; the value displayed is NOT in minutes or feet, It is a relative
tape used indicator. At the beginning of the tape the indicator will read 00.0.
4.5.1 Video Recorder Operation. The VRS is turned eight seconds once every minute in the sight status
on by placing the MODE switch in the STBY position. block of the CPG HAD and AND. To playback recorded
When this occurs, the tape recorder will thread the vid- video: place the MODE switch to PLAY and select the
eo cassette. Placing the MODE switch in the REC posi- desired playback method on the PLAY switch: STILL,
tion will arm the VID RCD pushbutton on the ORT REV, FAST REV, FWD or FAST FWD. If the MODE
RHG. Actuating the VID RCD pushbutton will turn on switch is placed in the RWND position, the digital disor
off the recording of video. When recording video, play, MIN, will automatically reset to 00.0 and the vidwhether
pilot or CPG, the prompt RECORDER eo tape recorder will start to rewind the cassette. Alwill
be displayed or the prompt RCDR ON m /m though the rewinding of the tape may be aborted
will be displayed initially for eight seconds and for by placing the MODE switch in any other position,
Change 4 4-7
TM 1-1520-238-10
DO NOT use RWND position unless the intent is to
completely rewind the tape because all elapsed counter
　
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