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.
