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copilot is identical except for the location of
controls on the CCU.
1. Select mode to be programmed (1N
through 4N). The first mode that will appear
is “1N” (Normal Mode 1).
2. P-PGM/CP-PGM/OPR switch — P-PGM or
CP-PGM.
3. ”PROG” blinking in display — Check. Verify
that a complete set of symbology is displayed
and attitude reference symbol is
blinking. Verify “PGM” is displayed in the
HUD FAIL message location for the DU not
being programmed.
4. BIT/ACK switch — ACK to program the full
display or go to step 5 and select desired
symbols.
5. PGM SEL/NXT control — SEL to select
symbol. Selected symbol stops blinking. If
symbol is not desired, toggle switch to NXT
and the symbol will disappear.
NOTE
All symbols have been programmed when the
“PROG” annunciator is the only symbol flashing.
6. BIT/ACK switch — ACK. (Hold switch to
ACK for one second.)
7. ”OK” displayed — Check. (”OK” will be
displayed for two seconds.)
NOTE
If programming is not accepted, “FAIL” will be
displayed. If a fail message is displayed, attempt
to reprogram the same mode, if fail reappears
notify maintenance.
Declutter mode is recognized by flashing
ground speed indicator in lieu of attitude reference
symbology.
TM 1-1520-240-10
4-1-25
8. MODE 1-4/DCLT switch — DCLT (1D
through 4D). The first DCLT mode that will
appear is “1D” (Declutter Mode 1).
NOTE
If MODE 1-4/DCLT switch is toggled to DCLT
a second time the display will cycle back to the
DCLT’s normal mode (1N-4N). The MODE
1-4/DCLT switch must be set to MODE 1-4 to
advance to another normal mode.
9. Repeat steps 4 through 7, for declutter.
10. Mode 1-4/DCLT switch — As required.
11. Repeat steps 4 through 10 until all desired
modes are programmed.
12. P-PGM/CP-PGM/OP switch — OP.
WARNING
An improperly adjusted barometric altimeter
will result in an improperly set HUD
barometric altitude display.
NOTE
Barometric altimeter set to the most current
altimeter settings, field elevation.
4-1-37. Adjustment of Barometric Altitude, Pitch,
and Roll.
1. Ensure P-PGM/OP/CP-PGM switch is in
the OP position.
2. ADJ/ON/OFF switch — Pull and set to ADJ.
NOTE
Changes to barometric altimeter settings will
require a corresponding change to the HUD
barometric altitude. Each 0.01 inch change in
pressure equals 10 feet.
3. ADJ blinking in display — Check.
4. INC/DEC switch — As required for BARO
ALT.
5. BIT/ACK switch — ACK.
6. Repeat steps 3 through 5 for pitch and roll.
7. ADJ/ON/OFF switch — ON.
4-1-38. In-flight Operation.
WARNING
Whenever the symbology displayed in the
DU is suspected of being incorrect the pilot
will compare the data with the aircraft
instrument indicator and take appropriate
action.
WARNING
Excessive brightness of the symbology
display may impair vision outside the
cockpit.
WARNING
Interruption of electrical power, such as
change over from APU generator to NO. 1
and NO. 2 generators and vice versa, will
cause DU to default to minimum brightness
and normal MODE 1N. Any adjustments
made to the barometric altitude,
pitch and roll prior to flight will be lost,
thereby decreasing the accuracy of the
barometric altitude, pitch and roll.
1. BRT/DIM switch — As desired.
NOTE
Whenever the symbology is interfering with
the outside visibility, declutter may be selected
to remove symbology.
2. MODE 1-4/DCLT switch — As required.
4-1-39. System Shutdown Procedure.
1. Set ADJ/ON/OFF switch —OFF.
2. Turn off ANVIS.
WARNING
CCU ADJ/ON/OFF switch must be OFF before
connecting or disconnecting quickrelease
connector.
WARNING
Do not disconnect DU by pulling on the
cable connected to the PSCU. The DU
could be damage or the cable may separate
from the PSCU creating an explosive
atmosphere hazard.
TM 1-1520-240-10
4-1-26
WARNING
Do not attempt to egress the aircraft without
performing disconnect as this may result
in neck injury.
CAUTION
Do not disconnect DU by pulling on the
cable. To do so may damage the DU.
3. Display Unit — Disconnect. Disconnect DU
by gasping the PSCU and rotating the
quick-release connector engagement ring
and pull downward. Remove OU by loosening
　
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