TM 55-1520-240-T
16-202 Change 24
16-5.3 AN/ALE-47 COUNTERMEASURES DISPENSER SYSTEM OPERATIONAL CHECK (Continued)
16-5.3
TASK
RESULT
77. Raise DCDU JETTISON switch guard (8) and move
DCDU expendable count remains the same; CDT
switch to on (forward).
count stays at 00.
78. Lower DCDU JETTISON switch guard (8).
79. Set LDG GR BYPASS switch (28) on LDG GR SW
BYPASS light on LDG GR SW BYPASS panel
BYPASS panel (27) to BYPASS.
(27) illuminates.
80. Raise DCDU JETTISON switch guard (8) and move
DCDU will count down and displays 01:0 02:0 CH:__ FL:0;
switch to on (forward).
00 is displayed on CDTs.
81. Lower DCDU JETTISON switch guard (8) .
82. Set DCDU MODE switch (7) to OFF, then to MAN
01:0 02:0 CH:__ FL:0 is displayed on DCDU.
83. Remove safety pin (30) from AN/ALE-47 safety
switch (31).
84. Raise DCDU JETTISON switch guard (8) and move
DCDU counts down and 01:0 02:0 CH:__ FL:0 is
switch to on (forward).
displayed: 30-60 is displayed on CDTs.
85. Lower DCDU JETTISON switch guard (8).
86. Set DCDU MODE switch (7) to OFF;
DCDU display is blank; 00 is displayed on CDTs.
press RESET TEST switch (21) on CDTs (16).
87. Raise DCDU JETTISON switch guard (8) and move
All INHIBIT lights illuminate momentarily;
switch to on (forward).
OFP and MDF numbers are displayed momentarily;
JETTISON ON is displayed on DCDU;
O1:0 O2:0 CH:_ _ FL:0 is displayed on DCDU;
30-60 is displayed on CDTs.
88. Lower DCDU JETTISON switch guard (8).
O1:0 O2:0 CH:_ _ FL:0 displayed on DCDU
goes out.
NOTE
DCDU MODE switch must be pressed while it is
turned to access BYP (bypass) mode.
89. Set DCDU MODE switch (7) to BYP;
DCDU displays are blank; 00 is displayed on CDTs.
press RESET TEST switch (21) on CDTs (16).
TASK
RESULT
90. Press and release FLARE DISP switch (22) on pilot’s
DCDU displays remain blank; CDTs will count up by XX.
or copilot’s cyclic grip (23).
91. Set DCDU MODE switch (7) to OFF and then BYP;
DCDU displays remain blank; 00 is displayed on CDTs.
press RESET TEST switch (21) on CDTs (16).
92. Set DCDU JETTISON switch (8) to on (forward).
DCDU expendable displays remain blank;
CDTs display 30-60.
93. Set DCDU JETTISON switch (8) to off (aft).
94. Set CDT MODE switch (18) to OFF.
95. Set DCDU MODE switch (7) to OFF.
96. Install safety pin (30) in AN/ALE-47 safety switch (31).
97. Set LDG GR SW BYPASS switch (28) on LDG GR
BYPASS light (29) on LDG GR SW STATUS panel (28)
SW STATUS panel (27) to NORMAL.
goes out.
98. Remove electrical power from aircraft.
99. Remove CDTs (16) from dispenser assemblies (15).
100. Repeat AN/ALE-47 Countermeasures Dispenser
System Operational Check on remaining dispenser
assemblies, if required.
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