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that is performed automatically along with normal system
operation. A failure of the SDC, pilot’s DU, or copilot’s DU
will illuminate the CCU FAIL light and display a FAIL
message on the DU. When a fail message is displayed
on the DU, the operator should acknowledge the failure
and rerun BIT to confirm the fault. 26-volt AC to operate
the HUD system is taken from the No. 1 INSTXFMR
through the HUD REF circuit breaker on the No. 1 PDP
DC power for the system is taken from the ESSENTIAL
bus through the HUD SYS circuit breaker also on the No.
1 PDP.
4-1-28. Controls and Function, Converter Control
Unit. (fig. 4-1-8)
CONTROLS/
INDICATOR
FUNCTION
CPLT
BRT/DIM Switch
Three position toggle switch
spring loaded to off. When
placed to BRT or DIM position
momentarily, copilots display
will increase or decrease
brightness (when held,
displays will go full bright or
full dim).
DSPL POS D/U/
L/R
Copilot’s control for display
position down/up (outer
knob) and left/right (inner
knob).
MODE 1-4/DCLT Three position toggle switch
spring loaded to off. Changes
the copilot’s primary mode
and/or primary mode’s
declutter display.
PLT
BRT/DIM Switch
Three position toggle switch
spring loaded to off. When
placed to BRT or DIM
position momentarily,
copilot’s display will increase
or decrease brightness
(when held, display will go
full bright or full dim).
TM 1-1520-240-10
4-1-18
CONTROLS/
INDICATOR
FUNCTION
DSPL POS D/U/
L/R
Pilot’s control for display
position down/up (outer
knob) and left/right (inner
knob).
MODE 1-4/DCLT
Switch
Three position toggle switch
spring-loaded to off. Changes
the pilot’s primary mode
and/or primary mode’s
decluttered display. refer to
paragraph 4-1-36 for detailed
procedures.
ADJ/ON/OFF Switch Three position switch. Selects
adjust mode, enabling the
INC/DEC switch to
adjust,altitudes, pitch or roll.
Turns power on/off to HUD
system.
FAIL Light Illuminates to indicate a
system failure.
ON Light Illuminates to indicate when
system is powered up.
P-PGM/OP/CP-PGM
Switch
Three position switch. Selects
pilot program mode,
operational mode or copilot
program mode. Used with the
PGM NXT/SEL switch.
BIT/ACK Switch Thee position toggle switch
spring-loaded to off. Placed to
BIT momentarily, selects
built-in-test. Placed to BIT
position and held, changes
display to symbol generator
test mode until switch is
released. When placed to
CONTROLS/
INDICATOR
FUNCTION
ACK, used to acknowledge
displayed fault, completion of
adjustment, or completion of
programming sequence. After
ACK is used to acknowledge
a fault, fault will not appear
until BIT is selected or power
is cycled off and on.
ALT/P/R DEC/INC
Switch
Thee position toggle switch
spring-loaded to off. Active
when adjust mode is selected
to decrease/increase
altitude/pitch/roll. When
adjusting altitude (MSL)
momentary movement of
DEC/INC switch will change
data in 5 ft increments. When
DEC/INC switch is held for
one second, data will change
in 10 ft increments. Pitch and
roll change in increments of 1
degree.
PGM NXT/SEL Thee position toggle switch
spring-loaded to off. Active
when program mode is
selected. Operator can
preprogram four normal
modes and four declutter
modes. Operator selects
flashing symbol for display or
goes to next symbol. Once
complete, operator toggles
ACK switch to save
programmed display. To
program full display, use ACK
after changing to new mode.
TM 1-1520-240-10
4-1-19
Figure 4-1-8. Heads Up Display AN/AVS-7
TM 1-1520-240-10
4-1-20
4-1-29. Controls and Function, Pilot/Copilot HUD
Control (THRUST CONT LEVER). (fig. 4-1-8)
CONTROLS/
INDICATOR
FUNCTION
BRT/DIM Allows pilot/copilot to control
brightness of their respective
displays.
MODE/DCLT Allows pilot/copilot to select
respective display modes or
declutter modes.
EYE SELECT Selects the proper orientation
of the symbology for left or
right eye viewing.
4-1-30. Modes of Operation.
There are two programming modes and one operational
mode for the HUD system selected by the programming
switch on the CCU. The adjust mode is a sub-mode
　
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