TM 5-5420-209-12
Table 2-13. Bridge Assembly Requirements.
Bays
Boats
Bridge Length
(Feet/Meters)
Ramp
Interior
Launch Sites Desired
Need
Desired
80 (24.38)
2
2
2
3
4
102 (31 .1)
2
3
2
4
4
124 (37.8)
2
4
2
4
5
146 (44.5)
2
5
2
5
5
168 (51 .20)
2
6
3
5
6
190 (57.9)
2
7
3
6
6
212 (64.6)
2
8
3
6
7
234 (71 .3)
2
9
3
6
7
256 (78)
2
10
3
7
7
additional (Note 1)
0-66 (20)
.
1-3
.
1
1
additional (Note 2)
0-88 (26.8)
1-3
.
1
1
additional (Note 3)
0-132 (40)
.
1-6
.
1
1
Notes:
1. In currents of 6 to 8 feet per second for each additional bridge length increase of 0 to 66 feet add the indicated number of boats.
2. In currents of 3 to 6 feet per second for each additional bridge length increase of 0 to 88 feet add the indicated number of boats.
3. In currents up to 3 feet per second for each additional bridge length increase of 0 to 132 feet add the indicated number of boats.
(Includes the safety boat but not the backup boats.)
2–14. Bay Free Launch. (figure 2-14) Where conditions permit, a bay maybe free launched. This method allows
the bay to roll off the transporter and unfold in the water. The water depth required varies with slope and position of trans-
porter in water. A maximum slope of 30 percent with a minimum water depth of 36 inches (44 inches for ramp bay) is
allowed for safe free launch (transporter on a 10 percent slope and backed into the water until the rear wheels are hub
deep in the water). When free launching on a 5-10 degree sideslope, in heavy winds and/or fast water, adjust boom and
winch cable hook to maximum height before paying out. This is to permit maximum range of motion for the tiedown hook
mechanism. The crew required for a free launch consists of an operator and an assistant. When an assistant is not as-
signed to stay with the transporter, a temporary assistant maybe designated from the staging area crew or shuttle crew
for duties to be performed in the staging area, or the launch site guide for duties to be performed at the launch site. This
will generally be the case in rapid bridge construction. The operator will drive and be responsible for the safe launching
of the bay. The assistant will help prepare bay and transport for launch. The free launch procedures are the same for
either a ramp bay or interior bay.
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