b. Loading/Unloading Scissored Bridge to/from a Lowbed Semitrailer
(M172 or M172A1).
This Task Covers:
General Mechanics Tool Box,
Timbers, one 4 x 4 in. x 10 ft.
(between rear duals), one
4 x 4 in. x 5 ft. (across gooseneck)
Chain, 3/8 in x 10 ft (tie-rod ends)
Chain binders, 12 ea (tiedowns)
Chock blocks (rear duals)
Earthmoving equipment as needed
Three to five (minimum)
The loading/unloading operation of the bridge is extremely dangerous. Essential
personnel should always take precautions when working around the bridge and associated
equipment. Non-essential personnel should always stay clear of the loading unloading
operation. Be aware of what is going on around you at all times and have a route of
(a) Select a level area with a bank that has enough room to negotiate a tractor-trailer from the
roadway and the launcher with bridge on top of the bank, behind the tractor-trailer.
(b) Construct a dugout area at the base of the bank for the trailer's rear set of duals.
(c) Build up the bank to a height of at least three to four feet above the bottom of the dugout area.
The build up should extend back behind the face of the bank for at least twenty feet.
(d) Back the trailer so that the rear set of duals are in the dugout and the back of trailer is up
against the bank.
2-84 Change 2