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TSUM - 3-011 Carriage Drive Failure (Low Bank Drive Out) (55) Part 2
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TM-5-5420-279-23 Dry Support Bridge (DSB) (NSN
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TSUM - 3-012 Bridge Lower (75) Part 2
TM 5-5420-279-23
TSUM - 3-012 Bridge Lower (75) Part 1
Home Bank (or Far Bank)
Carriage lower lifting beam
does not lower
W ARNING
For the Bridge to lower the following prerequisite
conditions m ust be m et:
CRUSH INJURY. BEFORE CARRYING OUT
*
Neutral gear selected
TROUBLESHOOTING INVOLVING SV10, A
*
Parking brake applied
SUSPENDED OR PART BUILT BRIDGE MUST
*
Tail Lift Pendant connected & powered
BE MADE SAFE EITHER BY COM PLETING THE
*
Chect Pack connected & powered
BUILD OPERATIONS IN BACK-UP MODE OR
*
4 Position Switch at position 4
BY RETRIEVING THE BRIDGE.
*
Ensure E-STOP RESET satisfactory
*
A-Fram e unfolded
CRUSH INJURY. A SUSPENDED BRIDGE W ILL
*
A-Fram e rotated
MOVE IF SV10 IS MANUALLY OPERATED AND
*
Slide Fram e extended
THE CHEST PACK RIGHT-HAND JOYSTICK IS
*
Relax Pins withdrawn & Lim it Switches closed
MOVED FROM THE CENTRAL POSITION
*
Chest Pack in Bridge Lift mode
CAUSING ACTIVATION OF OTHER SOLENOID
*
RH Joystick moved backward from centre
VALVES.
Are the
Power down & replace
following Mimic
Perform
defective Mim ic Panel.
Panel captions lit? - PV1b,
lamp test on
No
No
To replace Electrical
SV5, SV10 (see
Mim ic Panel.
Enclosure see
W ARNING), SV13a,
Are all lamps
maintenance
SV14a &
lit?
procedure 5-049
SV15a
Yes
Yes
Are the
following solenoid
Disconnect connectors
Insert probes of DMM
No
connector LEDs lit?- SV5,
from listed solenoids.
into sockets 1 & 2 of
SV10 (see W ARNING),
See maint procedure
each connector
SV13a, SV14a &
5-141
NOTE
SV15a
Solenoids SV5 & SV10 are
located on the Launch
Frame Pilot Manifold.
Yes
Solenoids SV13a, SV14a &
SV15a are located on the
Launch Frame W inch
Disconnect solenoid
Control Manifold
Replace solenoid
connectors from above
Is 24V
harness if connector
listed solenoids. Connect
Yes
solenoid supply
DMM across solenoid coil
LED not lit. See
present?
pins. See resistance
maintenance
procedure 5-139
check in m aint procedure
5-124
No
Power down and check
continuity from solenoid to
Replace faulty harness
control source.
or control box as appropriate.
See wiring diagram
Go to
For Electrical Enclosure see maint
G406-8604 sheet 7 at
Part 2
procedure 5-049 & for harnesses
see maint procedure
7, and cable routing tables
5-139
in Section 3.6 of Chapter 3
for the appropriate
solenoids

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