ARMY TM 5-5420-212-10-1
MARINE CORPS TM 08676A-10/1-1
o.
Rule 3
Raise both the FRB and RRB by 0.69 m as follows. Both roller beams are in the high position.
(1)
Raise both the FRB and RRB by 0.69 m to increase nose clearance (N) [Table 3-19, column (o)] and tail
clearance (T) [Table 3-19, column (p)].
N RULE 3 = N RULE 2 + 0.69 m
T RULE 3 = Value obtained from Table 3-19, column (p).
(2)
If N Rule 3 is not greater than H and T Rule 3 is greater than G, proceed to Rule 4a., Table 3-20, column
(q).
(3)
If N Rule 3 is greater than H and T Rule 3 is not greater than G, proceed to Rule 4b., Table 3-20, column
(r).
(4)
If N Rule 3 is greater than H and T Rule 3 is greater than G, the bridge has adequate nose and tail
clearance for launching, proceed to loads required.
TABLE 3-19. Rule 3 - DS 1 thru 12 Bay
Raise FRB & RRB to high position (increase N and T by 0.69 m)
2E + No. of Bays
N (o)
T (p)
1-4
N Rule3 =
1.24
5-7
N Rule 2 +
1.21
8-10
0.69 m
1.15
11-12
1.09
p.
Rule 4a
Lower RRB to low position (FRB is in high position).If there is ample tail clearance, some increase in N can be
obtained by keeping the FRB in its highest position and lowering the FRB to its lowest position. The mathematical equation
for this process is shown under Table 3-20, column (q). N Rule 4a. = N Rule 3 + value N calculated from the equation
shown under Table 3-20, column (q).
q.
Rule 4b
Lower FRB to low position (RRB is in high position). If there is ample nose clearance, some increase in T can be
obtained by keeping the RRB in its highest position and lowering the FRB to its lowest position. The mathematical equation
for this process is shown under Table 3-20 column (r).
T Rule 4b. = T Rule 3 + value T calculated from the equation shown under Table 3-20, column (r).
3-32
