ARMY TM 5-5420-212-10-1
MARINE CORPS TM 08676A-10/1-1
(8)
Raise rear of bridge and for single story bridges remove building pedestals. Check placement of landing roller
pedestal to ensure that landing roller is at right angles (900) to nose, and that there is no lateral deflection in
launching nose.
(9)
With the panel point of launch over the FRB or CRB, check that the given landing zone (LZ) number or higher is
over the center of the LRP rollers (para. 4-4).
NOTE
A landing zone number higher than the given LZ Is always permitted. Never use an LZ number lower
than that given for the bridge being constructed.
(10) Far bank crew guides launching nose onto roller and will hold in place during the first 10 ft (3 m) of launch.
b.
Stability of Landing Roller Pedestal
In the early stages of launching when vertical load on landing roller is small, the following action must be taken to
reduce the risk of instability. In addition to the following, the far bank party should stand on uphill side of landing roller pedestal
when there is a cross fall, or on the windward side if there is a strong wind, and steady the nose on the roller during the fir st 10
ft (3 m) of launch.
(1)
If the far bank cross fall is greater than the allowable 10% (1 in 10):
Action - Level the ground locally or use packing
OR
Commence launch with landing roller pedestal partly lowered, raising it when the bridge has been
launched 20 to 30 ft (6 to 9 m).
(2)
If there is a side load from bridge launched in a cross fall:
Action - Set forward roller beam within 3 in (75 mm) of horizontal before nose is lowered onto landing roller
pedestal.
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