Chapter 4. AIR TRANSPORTABILITY GUIDANCE

TM 55-2300-258-14

CHAPTER 4

A I R TRANSPORTABILITY GUIDANCE

axles lift off the ground and aircraft floor

4-1. Scope.

when cresting the aircraft ramp. Failure

This chapter provides transportability guidance for

to comply could result in damage to the

air movement of the HET and the C-HET systems.

aircraft.

It covers significant technical and physical charac-

teristics and safety considerations and prescribes

4-5. Transport by US air Force Aircraft

the materials required to prepare, load, and unload

a. The aircraft commander or his representative

the HET and the C-HET systems as an internal load

is responsible for insuring that the HET and the C-

in the C-5 cargo aircraft. The HET and the C-HET

HET systems are loaded, unloaded and properly

systems exceed the dimensional limitations for

secured in accordance with sections IV and VIA,

transport in the C-130 and C-141 aircraft.

item 18, of TO 1C-5A-9.

b. Restraint factors (g loads) for minimum ac-

4-2. Maximum Use of Aircraft Capacity

ceptable conditions specified for crew safety in the

The load described in this chapter is not a maximum

event of a controlled emergency landing are

aircraft load. Total cargo loads and operating ranges

specified in TO 1C-5A-9. The tiedown diagrams

are subject to variables such as weather, airfield

(figs. 4-1 and 4-2) and data table (table 4-1) are

conditions, individual aircraft characteristics, and

based on acceptable methods. Figures 4-1 and 4-2

distance. General guidance on total cargo loads and

show a representative pattern. The exact placement

operating ranges are provided in TM 38-236/(AFP

of the system in the aircraft is primarily dependent

71-8). For specific guidance contact the nearest

upon the aircraft-ready-for-loading weight and other

Military Airlift Command (MAC) Activity.

cargo to be loaded. Since both factors are subject to

wide variances, the exact placement cannot be

4-3. Safety

shown in this manual and must be determined on an

Safety precautions are listed in chapter 3.

individual load basis. Table 4-1 lists the tiedown

devices required (provided aboard aircraft) and

4-4. Preparation of system

tiedown points on the HET and C-HET systems.

a. No special handling is required for transport of

c. The HET and C-HET systems may be driven

the HET and the C-HET systems in the C-5 air-

over the forward or aft ramps to the final position

craft. It may be transported in its operational con-

aboard the aircraft. When the system has been

figuration.

positioned, the truck transmission must be placed in

b. Insure that the system brakes are serviceable

the lowest gear and the parking brakes set.

and that no rocks or stones are embedded in the tire

WARNING

treads or between the dual tires.

Consult TM 38-250 (AFM 71-4) to insure

c. The HET and the C-HET systems must be

compatibility y of any cargo being con-

clean and frse of dirt, grease, or other debris that

sidered for loading and transported with

could be dislodged from the system during loading,

the HET and C-HET systems.

unloading, or transport.

4-6. Transport by US Army Aircraft

CAUTION

Do not load the HET or the C-HET

The HET and the C-HET systems exceed weight

systems on the aircraft with any equip-

and size limitations for transport by US Army

ment or cargo secured on the trailer. The

fixed-or rotary-wing aircraft.

wheels of the forward and rear trailer

4-1