ARMY TM 5-5420-212-10-1MARINE CORPS TM 08676A-10/1-14-4 LANDING ZONE NUMBERThe building tables and build procedures include a landing zone number to ensure correct location of the landingroller pedestal under the launching nose. The light launching nose is considered as divided into twenty equal zones,each 1 ft (300 mm) in length. During building or delaunching, the landing roller pedestal must be positioned not lessthan 9 in (229 mm) from the F peg, and at this time the LZ number is checked for correct position over the landing rollerpedestal roller. The landing zone number should be that given or HIGHER. Never less than that given.4-5 ROLLER BEAMSIn the assembly/disassembly procedures described in Chapters 5, 6, and 7 the term “roller beam” is defined asfollows:Single Story bridges the roller beam comprises - roller beam, baseplates and fixed supports.Double Story and Link Reinforced bridges the front or rear roller beam comprises - roller beam, crossgirder, baseplatesand adjustable supports. A capsill roller beam comprises - rocking rollers, capsill beam, cross girder, baseplates andadjustable supports.a. Single StorySingle story bridges are launched on one roller beam, with building pedestals to support the bridge during assembly.The drill to set up the roller beam is as follows:(1)Position the roller beam so that it is approximately centered over the RB peg and at 90° to the bridgecenterline4-4Change 2
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