Section Ill. TRANSPORT OF HET AND C-HET SYSTEMS WITH PAYLOAD

TM 55-2320-258-14

Table 5-2.

Table 5-1.

(Fig 5 - 4 )

(Fig. 5-1)

Section Ill. TRANSPORT OF HET AND C-HET SYSTEMS WITH PAYLOAD

system for movement to the appropriate state high-

5-6. Transport of Payload

way departments, and this certification must be

a. General. Movement of loaded HET and C-HET

made prior to moving.

systems with a payload (M48-M60 series tanks) is

c. Loaded Characteristics. Characteristics of the

normally made over public highways in CONUS and

loaded system are shown in figures 5-3 and 5-6,

overseas when other modes of transport are not

which show that the transport system exceeds the

available or practical. The loaded HET and C-HET

50,000-pound tandem-axle loads mentioned above.

systems exceed the CONUS legal dimensional and

The state-preferred

percent allowable is also

weight limitations; therefore, special permits are

exceeded. T h e computed overstress is ap-

required in CON US, and special routing is required

proximately 170 percent for the loaded HET and C-

overseas as indicated in paragraph 5-3.

HET systems on a typical H-15 highway bridge.

b. Bridge Limitations. Besides being oversized

d. MTMC Assistance. Assistance for highway

and overweight, of particular note are the high tan-

movement of the loaded transport system can be

dem-axle weights, and the high computed overstress

secured from the Commander, Military Traffic

of the loaded HET and C-HET systems when on a

MT-SA,

ATTN:

M a n a g e m e n t Command,

typical civilian load-rated H-15 structure in the

Washington, DC 20315, when highway movement

United States. Respectively, most states allow tan-

can be certified as essential for national defense and

dem-axle loads of up to 50,000 pounds, and com-

no other transportation mode can be utilized.

puted overstress of bridge materials of up to 133

e. Loading, Tiedowns, and Safety. Requirements

percent (when compared to design-allowable stress),

for loading and/or transporting a tank on the HET

without certification of essentiality to national

and C-HET systems may be obtained from TM

defense. Accordingly, all highway movements of the

55-2350-215-10-15 and TM 9-2330-294-15.

loaded HET and C-HET systems must be ac-

f. Figures 5-6, 5-7, and 5-8. These figures show

companied by a "certification of essentiality to

various axleloads with pusher axle raised and

national defense" issued by the activity offering the

lowered for the C-HET system.

5-8