TM-55-2320-279-14
M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)
TRANSPORTABILITY GUIDANCE
TM-55-2320-279-14 - Page 34 of 46
TM 55-2320-279-14
6-5. Special Design Ships
Seatrain vessels, roll-on/roll-off (RORC) vessels,
landing ships, and attack-cargo vessels are all
equipped with patented lashing gear and pre-posi-
tioned fittings in the deck. With proper application
of lashing gear, blocking and bracing will not be
required, Different classes of RORO vessels have
different grid patterns for pre-positioned fittings.
RORO ships are ideal for transport of the
HEMTTs.
6-6. Barges and Lighters
The HEMTTs can be transported in SEABEE
barges and LASH lighters, with hatch covers in
place. When the HEMTTs are transported by
SEABEE barges or LASH lighters, the vehicles
must be secured with blocking and tiedowns as
shown in figure 6–3 and materials applied as indi-
cated in tables 6–1 and 6–2. Barge stability is no-
ticeably affected by the placement of heavy items;
therefore, the HEMTTs should be loaded in a
manner to counterbalance variations in the loca-
tions of the center of gravity. (After loading one
vehicle in one end of a barge or lighter, load an-
other vehicle in the opposite end before loading a
vehicle next to the first vehicle.) Shoring is not
generally used beneath vehicles equipped with
rubber tires. Deck surfaces should be dry and free
of grease and/or debris.
Table 6-1. Bill of Materials for Blocking and Tiedown of HEMTT in General Cargo Vessel (Fig 6-3)
Table 6-2. Application of Materials for Blocking and Tiedown of HEMTT in General-Cargo Vessel (Fig 6-3)
6-7. Landing Ships, Landing Crafts, and Amphibious
Vehicles
When HEMTTs are moved for extended distances
or through rough waters, blocking and tiedowns
must be used. In most cases, the vessels are
equipped with turnbuckles with a sheep’s-foot on
one end that fits into a deck cloverleaf. On vessels
that do not have cloverleaf and patented lashings,
a suitable substitute may be used. When the
HEMTTs are moved to or from vessels secured to
piers or in sheltered anchorages, only tiedowns
will be required.
6- 7
173-131 O - 87 -
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