TM 5-5420-278-10 0036 00 0036 00-5 BRIDGE OPERATION (Contd) HYBRID IRB/IFB BRIDGE MLC WATER CURRENT VELOCITY FEET/SEC (METERS/SEC) RATINGS CROSSING TYPE 0 1-2 3-4 5-6 7-8 9-10 (0.0) (0.3-0.6) (0.9-1.2) (1.5-1.8) (2.1-2.4) (2.7 - 3.0) NORMAL Track 75 75 75 70 60 30 Wheel 96 96 96 96 65 30 CAUTION Track 85 85 85 80 65 35 Wheel 105 105 105 100 75 35 RISK Track 100 100 100 90 75 40 Wheel 110 110 110 105 80 40 Table 5. Improved Ribbon Bridge Operation Hybrid IRB/IFB MLC Ratings. CAUTION The following vehicles have known bank height limitations and bank preparation prior to trafficking these vehicles may be required: Heavy Equipment Transporter (HET) M1070 and M1000: Bank heights should not exceed 24 in. (0.6 m). This is limited by the tractor-trailer combination being limited to break-over/break-under angles of 15%. Severe damage can occur to the trailer if trafficking with bank heights higher than 24 in. (0.6 m) is attempted. Abrams (M1) with Mine Clearing Blade (MCB): Bank heights should not exceed 18 in. (0.46 m). This is limited by clearance of the MCB with the bridge and ramp deck. Severe damage can occur to the bridge or ramp deck if trafficking with bank heights higher than 18 in. (0.46 m) is attempted. Armor Vehicle Launched Bridge (AVLB): Bank heights should not exceed 46 in. 1.16 m). This is limited by clearance of the AVLB’s bridge outrigger with the bridge and ramp deck. Severe damage can occur to the bridge or ramp deck if trafficking with bank heights higher than 46 in. (1.16 m) is attempted. Other vehicles with low, far overhangs or terrain limitations should be closely monitored and adjustments made to bank heights as necessary. Attempting to cross any vehicle above the recommended bank height or 79 in. (2 m), whichever is less, may result in damage to the bridge or ramp deck or the crossing vehicle itself.