On the chest pack, ensure that the appropriate bank condition dependent on home
bank slope condition is selected.
During bridge build it is important that the correct build mode is selected, the mode
required will be determined by the height of the far bank:
Far bank above the home bank:
Far bank below the home bank:
Far bank at the same height as the home bank:
If during bridge build in HIGH BANK mode, a situation arises where the chest pack FAULT
light and the TOP WINCH light flash simultaneously, this is an indication that the top
winch cable has become slack. The software controlling the system will stop the top
winch from paying out any more cable. To rectify the condition the chest pack operator
should carefully move the right hand joystick rearward to pay in cable until the top winch
cable is re-tensioned and the fault condition is removed. Should this condition occur, it
should be confirmed that the correct build mode has been selected for bridge build, i.e. is
HIGH bank being used in a LEVEL bank situation?
During the early stages of a bridge build the bank condition selected on the chest pack
may differ from that selected during site reconnaissance. The launcher itself may be on
an incline. This would require the bridge to be pulled up an incline before its center of
gravity passes the A-frame and the bridge then slopes down hill. For the first two
modules the bridge build selections are:
Slide frame slopes down:
Slide frame slopes up:
Slide frame level:
On the chest pack, move the joystick forward/rearward once to set the appropriate
build condition as described above.
Move the joystick once to the right to confirm the setting and make sure the POWER
and the required bridge drive logic HIGH or LOW captions are illuminated and the
MODE SELECT caption goes off. Make sure the TILT ROLLER caption in the
forward left corner of the chest pack illuminates/flashes.
If required move the chest pack right-hand joystick slowly forward to move the far
bank carriage so that any slack in the bridge lifting slings is removed.
Disconnect the crane from the far bank ramp module push/pull sling.