TM 5-5420-278-100019 000019 00-4CAUTIONThe following vehicles have known bank heightlimitations. Bank preparation prior to trafficking thesevehicles may be required.Heavy Equipment Transporter (HET) M1070 andM1000: Bank heights should not exceed 24 in. (0.6 m).This is limited by the tractor-trailer combination beinglimited to break-over/break-under angles of 15%.Severe damage can occur to the trailer if traffickingwith bank heights higher than 24 in. (0.6 m) isattempted.Abrams (M1) with Mine Clearing Blade (MCB): Bankheights should not exceed 18 in. (0.46 m). This islimited by clearance of the MCB with the bridge andramp deck. Severe damage can occur to the bridge orramp deck if trafficking with bank heights higher than18 in. (0.46 m) is attempted.Armor Vehicle Launched Bridge (AVLB): Bank heightsshould not exceed 46 in. (1.16 m). This is limited byclearance of the AVLB’s bridge outrigger with thebridge and ramp deck. Severe damage can occur to thebridge or ramp deck if trafficking with bank heightshigher than 46 in. (1.16 m) is attempted.Ovehicles with low far overhangs or terrain limitationsshould be closely monitored and adjustments made tobank heights as necessary.Attempting to cross any vehicle above therecommended bank height or 79 in. (2 m), whichever isless, may result in damage to the bridge or ramp deckor the crossing vehicle itself.(5) The site should have a firm, stable bank with a slope of 11 degrees orless, a water depth of at least 48 in. (102 cm), and a current velocity of10 ft (3 m) per second or less to launch BEBs. c. All bridge sites require the following characteristics: CAUTIONGravel and small rocks on roadway surface leading tobridge can cause dents and punctures in bridgeroadway deck and can also become lodged in ramp andinterior bay unfolding mechanisms, causing jammingduring bay retrieval. If gravel or small rocks arepresent at bridge site, either remove them or coverthem with topsoil or sand.(1) The site should be located upstream from a raft site.(2) The site should be located where there are established road networkson both sides of the river.SITE REQUIREMENTS AND LAYOUTS (Contd)
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