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or damage to equipment.
Follow all procedures carefully. All countermeasure
expendables can cause injury
and serious damage to equipment.
CAUTION
The DCDU MODE switch should be placed
to OFF or STBY for takeoffs and landings.
Additional safeing of the system would include
inserting the safety pin in the safety
switch located in the aft cabin at station
518 BL50L.
1. AN/ALE-47 safety switch pin — Removed.
2. DCDU switches — Set as follows:
a. MODE — MAN, SEMI, or AUTO as required.
b. MWS switch — ON (if AUTO dispense
of expendables is desired).
c. O1, O2, CH. and FL switches — ON. As
required (Indicator lights not illuminated).
NOTE
Current programming enables AUTO and
MAN dispense of expendables while in SEMI
mode when MWS switch is ON.
d. To initiate flare dispense, after MODE
switch is set to MAN, SEMI, or AUTO,
press FLARE DISP switch on the pilot’s
or copilot’s cyclic grip or press any of
the four hand-held crew dispense
switches located in the cabin at station
200 and 400 left and right.
e. MANUAL switch — Set to any program
1 through 4, as required.
f. To dispense using manual program 6
(not selected o the DCDU), set MODE
switch to MAN; Manual switch in any
position; and press any of the four crew
dispense switches in the cabin at station
200 and 400 left and right.
CAUTION
If jettison is attempted and no expendables
jettison, set JETTISON switch to
OFF, and reset CMDS system by turning
the DCDU MODE switch to OFF, then to
STBY, MAN, SEMI, or AUTO. Reattempt jettison
by setting JETTISON switch to ON.
3. Jettison is inhibited with safety pin installed
in safety switch.
4. If an in-flight emergency is evident and payload
jettison is required: JETTISON switch
— Raise switch guard, set switch to ON. All
expendables should jettison.
TM 1-1520-240-10
4-1-17
4-1-26. CMDS Messages.
Below is a list of messages appearing on the CMDS
display:
DISPLAY MALFUNCTION
OFP MDF# None
JETTISON ON Jettison switch on
PROFAIL GO BYP Loss of programmer
AUTOFAIL GO MAN Not used
BUMP FAIL Not used
AUTO DEG Not used
PROGAFIL GO BYP Loss of SDL
CDU FAIL GO BYP DCDU failure
CH ENAB SW FAIL Loss of chaff inhibit
FL ENAB SW FAIL Loss of flare inhibit
O1 ENAB SW FAIL Loss of OTHER 1 inhibit
O2 ENAB SW FAIL Loss of OTHER 2 inhibit
RWR ENAB SW FAIL Loss of RWR inhibit
JETT FAIL Loss of remote jettison switch
MAN FAIL CH PROG Loss of DCDU PRGM switch
MAN FAIL1-4 FAIL Loss of manual dispense
SEQ# FAIL Sequencer failure
SEQ# INV DEG Payload polling problem
SEQ# BYP DEG Bypass dispense problem
SEQ# JETT FAIL Loss of bypass jettison
SEQ# OP FAIL Sequencer safety failure
4-1-27. Heads Up Display (AN/AVS-7) System.
The Heads Up Display (HUD) System (fig. 4-1-8) serves
as an aid to pilots using the AN/AVS -6 (ANVIS) during
night flight operations. The system allows the pilot and
copilot to receive flight data without viewing the instrument
panel. Instrument data is applied to the system,
processed for display, and superimposed over the ANVIS
image. The set consists of the Converter Control Unit
(CCU) on the console, the Signal Data Converter (SDC)
on the avionics shelf, an inclinometer and air data transducer
both located on the avionics shelf, a HUD control
switch on the pilot’s/copilot’s THRUST CONT (control)
lever, and the Display Unit (DU), consisting of the Optical
Unit (OU) and Power Supply Calibration Unit (PSCU).
The CCU selects pilot/copilot programming which allows
the pilot and copilot to select information for their respective
display modes from a master set of symbols. The
pilot and copilot can independently program up to eight
display modes, four normal and four declutter, which can
be selected for display. Declutter can be used when less
symboling is needed. The declutter mode has four vital
symbols that will always be displayed: Airspeed, Altitude
(MSL), Altitude (pitch and roll), and Engine Torque (s). An
adjust mode, during operation is used to adjust barometric
altitude, pitch and roll. If the HUD system loses operating
power after adjustments have been made, the barometric
altitude, pitch and roll must be readjusted. The
system self test is divided into power-up and operator
initialized built-in-test (BIT) and infight (BIT). The system
built-in test (BIT) is initialized during power-up or selected
by the operator. Part of the BIT is a periodic test
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