TM 5-5420-278-100042 000042 00-7LONGITUDINAL RAFTING PROCEDURE (Contd)Table 1. Longitudinal Rafting Ratings Table (Contd).c. Accumulations of snow, mud, or ice will reduce the ratings from those givenin the preceding table.2. Raft commander must observe leading edge of raft and ramps and decreasespeeds or halt operations, as necessary, if continuous water is coming over bow damor ramp tips.3. For 4-bay, 5-bay, and 6-bay rafts, ratings are for single or multiple vehicles. 7-bay rafts have separate ratings for single vehicles and multiple vehicles.4. For single vehicle loads, vehicles should be loaded on the centerline of theroadway and centered between the ramps. For multiple vehicle loads, heaviervehicles should be placed towards the center of the raft, with lighter vehiclestowards the ramps. Vehicles with an MLC of less than 20 may be loaded adjacentlyon either side of the raft centerline but should be of the same general type andMLC. Total added MLC for multiple vehicle loads shall not exceed the multiplevehicle rating. Vehicle loads shall not be on or overhang onto ramps. 5. Ratings apply only with bottom of ramp ends raised 12 in. (30 cm) before raftis under way.6. For longitudinal rafting, current speeds cannot exceed 5 feet/sec (1.5 meters/sec) at off-load/on-load sites. However, for higher mid-stream currents,longitudinal rafting capacity is greater than conventional rafting capacity for thesame raft size and current speed.7. For conventional rafting, two BEBs are used. Refer to figure 3, LongitudinalRafting Procedures, to determine where and how boats are attached to longitudinalrafts.WARNINGNever intermix IFB bays with IRB bays when buildingrafts. Failure to comply may result in damage toequipment or possible injury or death to personnel.8. Do not intermix IFB bays with IRB bays when building rafts.
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