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Electrical System - TM-5-5420-279-230051
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TM-5-5420-279-23 Dry Support Bridge (DSB) (NSN
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TM 5-5420-279-23
1-10-40 Monitoring Block
A monitoring block is installed in the pressure line from the hydraulic pump to give hydraulic
pressure, flow and temperature indications to assist monitoring and fault finding of the hydraulic
system.
1-10-41 Filter Indicators
All hydraulic filters are equipped with an electrical indicator which signals filter restrictions to the
launch chest pack and electrical control cabinet.
1-10-42 Hydraulic Fluid Level Switches
The hydraulic reservoir is fitted with two fluid level warning switches, which produce warning
signals to the launch chest pack and the electrical control cabinet. One provides fluid low-level
warning indication and the other a warning of an unsafe fluid level with the potential to cause
damage to the hydraulic pump.
1-10-43 Hydraulic Reservoir Sampling Point
At the top of the hydraulic reservoir, a valved port is provided to permit hydraulic fluid sampling
from the center of the reservoir.
1-10-44 Interface Cabinet
a.
The interface cabinet is installed at the right side of the launcher vehicle LV to the rear of
the crane stabilizer leg, and incorporates an internal mimic panel, which indicates the functioning
of the electrical controls and sensors of the hydraulic system. The cabinet also provides electrical
switches to deploy the A-Frame and test points to monitor the voltages and currents to the
solenoid control valves and the voltages in the control circuitry.
b.
An hour meter, built into the cabinet, is connected to a pressure switch in each hydraulic
circuit to monitor and record the hydraulic system usage at pressures in excess of 440 Psi
(3033.69 kPa), i.e. when a selected function is operating. This record is used to assist collation of
failure data and the planning of routine maintenance.
1-10-45 Emergency Stop System
a.
Emergency stop buttons are fitted at strategic locations where crew members are working
which stop all operating functions and disconnect the power take off in the event of an
emergency.
b.
Eight emergency stop buttons are used, some of which are illuminated. Their quantities
and locations are:
1 - Crane
1 - Tail Lift
1 - Operator Panel
2 - Launch Frame
1 - Launch Chest Pack
2 - A-Frame Legs
c.
Pressing any button will cause operation to cease and the PTO to disengage; the operator
panel of the interface cabinet identifying which button has been activated will illuminate. The
reason for emergency shut down should be ascertained and that it is safe to proceed before
1-26

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