PS Magazine - TB 43-PS-679
PS, The Preventative Maintenance Monthly
ISSUE 679
JUNE 2009
12
PS 679
JUN 09
S
ecure a shelter to a 2
1
/
2
- or a 5-ton FMTV truck. Sounds
simple enough, but can you do it the right way?
Troops have enough to think about while conducting
vehicle operations. Properly securing and checking loads
removes one possible problem—shifting loads—from
their list of things to be concerned about.
Some units use many types of tiedown methods to
secure their shelters. But only the
authorized
method
should be used to secure storage and equipment
shelters to 2
1
/
2
- and 5-ton cargo trucks.
Correctly Securing a Shelter
Tiedown Requirements
There are three different tiedown kits for securing the S-280 shelter to FMTVs. The
M1085 uses NSN 3990-01-494-6074 (PN 57K4447), the M1083 uses NSN 3990-01-488-4320
(PN 57K4378), and the LMTV model 1078 uses NSN 3990-01-494-6071 (PN 57K4449).
The correct tiedown method is explained in the following publications:
The sling leg assembly’s tension is an important unbalanced force that will keep the
shelter on the back of the truck
and
keep it from shifting rearward or forward under
quick acceleration or deceleration.
Although
empty
shelters
weigh
approximately
1,400
pounds,
they
could
have
a
payload weight of up to 5,000
pounds, resulting in a total
shelter weight of 6,400 pounds.
You should
never
use nylon
cargo straps to secure a shelter
to a 2
1
/
2
- and 5-ton cargo truck
because
the
shelter
and
its
contents are too heavy. Nylon
straps stretch and they’re no
match for a shifting shelter!
When securing a shelter to a
2
1
/
2
- and 5-ton FMTV cargo
truck, you must ensure that the
tension of the tiedowns will
keep the shelter in place. Place
the turnbuckles low, near the
bed of the truck—not at the top
of the shelter—so you can reach
them. Then you can make sure
the tiedowns are tight and have
the proper tension.
Each publication calls for the use of a steel, multiple-leg sling assembly, NSN 3940-
00-805-5533.
(Note that this item used to be NSN 3940-00-846-9858.)
This NSN may
still appear in some documents; however, only the
new
NSN, 3940-00-805-5533, should be
used when ordering the sling assembly.
This sling assembly is used to lift the shelter on and off a 2
1
/
2
- and 5-ton cargo truck
and to secure the shelter to the vehicle. It comes with all of the hardware needed for
both tasks, including the plate and eyebolt assembly. For many shelters, the sling assembly
is the only basic issue item that comes with them.
•
TM 9-2320-392-20, EM 0195, under “Special Purpose Maintenance Work Packages”
•
Military Traf±c Management Command Transportation Engineering Agency
(MTMCTEA) Pamphlet 55-20,
Tiedown Handbook for Truck Movements
•
TM 10-5411-207-14,
Operator’s, Unit, Direct Support, and General Support
Maintenance Manual for Shelter, Electrical Equipment S-280C/G
•
TM 11-5411-216-14&P,
Operator, Unit, Direct Support (DS), and General Support (GS)
Maintenance Manual for Electronic Equipment Storage Shelter: S-744/TSM-191 V
Shelters…
The
Right
Type of
Hookup
Here’s the
guidance they
should
have
followed…
think back
a minute to
sir isaac
newton and
his first
law of
motion…
an object at rest
tends to stay at rest
and an object in motion
tends to stay in motion
with the same speed and
in the same direction
unless acted upon by an
unbalanced force.
Here’s
what
NOT
to do!
Don’t use other wire
rope assemblies
Don’t use alternate
tiedown points
Don’t combine
shackles
Don’t use
nylon cargo
straps
679.12-13.indd
1-2
5/4/09
5:26:35 PM
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