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TM 1-1520-238-10
4.22 EXTERNAL STORES SUBSYSTEM (ESS).
The ESS consists of an external stores controller and
up to four pylon assemblies. The external stores controller
commands the pylons to the required elevation
angles for the various fire control modes. The modes
are: ground stow; flight stow; and FCC control.
The ground stow mode articulates the pylons so that
the wing stores are parallel with the ground over level
terrain. The ground stow mode is automatically commanded
on landing when the squat switch goes to
ground mode, or in flight whenever the rocket select
switch, RKT, (fig 4-14) is placed in the GND STOW
position. The GND STOW position would normally be
selected immediately prior to landing on uneven terrain
or when making a slope landing. The flight stow
mode articulates the pylons to a single fixed position so
that the wing stores present minimum flat plate drag
area in forward flight. The flight stow mode is automatically
commanded on takeoff whenever the squat
switch goes air mode. The PLT/GND ORIDE switch
will not override the squat switch for these functions.
In flight, the pylons remain in the flight stow mode until
missiles or rockets are actioned, which then places
the pylons under FCC control. Under FCC control the
pylons can be commanded through a range of +4.9 to
-15 degrees. If the forward flight airspeed as sensed by
the ADSS is 100 KTAS or greater, the pylons will remain
in the flight stow position under FCC control and
will not articulate. The external stores controller receives
115 vac power from the No. 1 essential bus and
28 vdc from the No. 2 essential dc bus. The external
stores controller is monitored continuously by FD/LS;
the on command test (test 10-PYLN) will fault isolate to
the LRU.
4.22.1 Pylon Assemblies. The pylon assembly contains
the pylon MRTU, the pylon aerial rocket control
subsystem station director, the ejector rack, and the hydraulic
actuator for articulation (fig 2-2). The pylon
MRTU is used to interface the missile launcher and station
director with the multiplex bus. The ejector rack
contains the attaching lugs for the wing store, the
winch assembly for lifting the wing store, and the ballistic
ejector for stores jettison. The pylon assembly connects
to electrical and hydraulic power when attached
to the helicopter wing.
a. Wing Stores Jettison. Each pylon is equipped
with an electrically operated ballistic ejector to jettison
the attached wing store. Selectable wing stores jettison
is activated by lifting the guard and pressing the spring
loaded switch for the desired store (fig 2-11). An emergency
stores jettison switch is located on each collective
switchbox (fig 2-26) which when activated will jettison
all wing stations simultaneously. The wings stores jettison
receives 28 vdc power from the No. 2 essential dc
bus and the emergency dc bus; the selectable stores jettison
circuit is protected by the MISSION JETT circuit
breaker on the pilot overhead circuit breaker panel;
the emergency stores jettison circuit is protected by
the JETT circuit breaker on the pilot overhead circuit
breaker panel. The two stores jettison circuits are completely
independent.
4-35
TM 1-1520-238-10
4.23 OPTICAL RELAY TUBE (ORT) CONTROLS AND power as part of the overall TADS system. The ORT is
DISPLAYS. continuously monitored as part of the overall TADS FD/
LS; the on command test (test 14-TADS) will fault iso-
The ORT (fig 4-15) is located between the CPG left and late to the LRU. Controls and functions are described in
right vertical instrument panels (fig 2-8) and receives table 4-12.
Figure 4-15. ORT and Hand Controls
4-36
TM 1-1520-238-10
Table 412. ORT and Hand Controls/Display Functions
Control/
Display I Position Function
Left Hand Grip
IAT/MAN
Field of
view select
WAS
Sensor
select
UPDT/ST
IAT OFS
LMC
Weapons
trigger
W
M
N
Z
RKT
GUN
MSL
DVO
DTV
FLIR
Engages or disengages the image autotracker. On disengagement the TADS turret
is placed in manual track.
Selects the field of view desired.
Wide field of view.
Medium field of view.
Narrow field of view.
Zoom or underscan field of view.
Weapons action switch. Actions the selected armament and removes the electrical
trigger interlock.
Actions the Aerial Rocket Control System; pylons will articulate to commanded
quadrant elevation and displays the rocker steering indicator. The ORT WAS in
the RKT position defines the cooperative engagement mode.
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