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TM 55-450-2. If the crate is very heavy, an MB-1 tiedown
devise should be used to provide forward restraint and
should be fastened to the 10,000-pound tiedown fittings.
6-6-54. General Cargo Tiedown.
General cargo tiedown methods are shown in TM
55-450-2.
6-6-55. 463 L Pallet/Extended Range Fuel System
(ERFS).
The restraint criteria of a 463L pallet/ERFS loaded to
7,500 pounds is as follows.
Direction Load Factor
Forward 6g plus 1.5g down
Aft 3g plus 1.5g down
Lateral 2.25g plus 1.5g down
Up 6g
Down 3g
NOTE
The HICHS can yield locally under the above
loads, but ultimate failure cannot occur; that
is the cargo (e.g., pallet, ERFS) cannot become
a flying object when the above loads are
applied. The above ultimate load factors shall
be applied to the entire HICHS. All other cargo
will be restrained to the normal restraint criteria
as stated in this chapter.
6-6-56. Loading Sequence.
Refer to table 6-4-2 to select the proper configuration for
system components during loading. Up to three pallets
may be winched or manually loaded on the system.
Loading clearances are shown in figures 6-6-14, 6-6-15,
and 6-6-16.
6-6-57. Warehouse Pallets.
Refer to table 6-4-2 to select the proper configuration for
system components during loading. Up to 10 warehouse
pallets can be loaded into the helicopter provided that the
weight and C.G. requirements are within the limits specified
as follows. The 40- inch side should be positioned
across the handling system so that the 48-inch side is on
the outboard rail. Pallets may be winched or manually
loaded. During loading, the pallet should be fork lifted
onto the ramp extension and balanced onto the ramp
rollers. On the ramp, it should be pushed on board.
NOTE
All cargo must be properly restrained to ensure
safe operation of the helicopter and safety
of personnel. Loads must be restrained in
accordance with procedures and guidelines
in TM 10-450-2, Helicopter Internal Loads.
Individual warehouse pallets may weigh up to 3,700 lbs.
However, to maintain floor isolation, the sum of the
weights of longitudinally adjacent pallets must not exceed
4,300 lbs. For example, pallets weighing 2,100 lbs
or less may be loaded without discrimination; a mix of
pallets weighing, for example, 3,000 lbs and 1,200 lbs,
would require alternate loading of a 3,000 lb pallet and a
1,200 lb pallet. If the load consists entirely of pallets
weighing in excess of 2,150 lbs, the pallets must be
spaced longitudinally such that the distance, in inches,
between the forward edge of one pallet and the forward
edge of one pallet and the forward edge of the subsequent
pallet will not be less than W/45.2 when W is the
average pallet load in pounds. For example, load of pallets
weighing 3,000 lbs each would need to be spaced
3000/45.2 = 66 inches center-to center apart. Pallets that
are spaced longitudinally will require tiedowns for longitudinal,
lateral, and vertical forces. In this situation there
is no requirement to use the barrier systems.
6-6-58. Wheeled Vehicles.
Refer to table 6-4-2 to select the proper configuration for
system components during loading. Winch or manually
load the vehicles into the helicopter.
6-6-59. Personnel.
The Internal Cargo Handling System (HICHS), is compatible
for personnel only or for both cargo and personnel.
If both are loaded, the cargo should be forward of the
personnel for safety.
6-6-60. Miscellaneous Cargo.
Place on a pallet or skid as desired. If a 6/E (463L) pallet
is used, secure the pallet with the locks or retractable
flanges. Straps or chains may be used as required.
6-6-61. Mixed Cargo.
Any of the previous cargos may be mixed as desired. The
only limitation is space.
TM 1-1520-240-10
6-6-25
6-6-62. Load Dumping From Ramp.
CAUTION
Damage to the helicopter or load could
occur when load dumping from the ramp.
Make sure taxi surface is level and free of
obstacles.
Dumping from the ramp is not a routine operation, but
under urgent conditions can be accomplished as follows:
a. Helicopter at full stop.
b. Remove ramp extensions and rollers if installed.
c. Load released, but under control and moved to
aft cabin ramp with ramp slightly in up position.
WARNING
Crew members must remain clear of load.
d. Helicopter taxis forward at approximately 5 knots
ground speed. When 5 knots is reached, the ramp should
be lowered and load pushed out the ramp of the helicopter.
e. Repeat as required.
6-6-63. Extended Range Fuel System (ERFS), ERFS
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