TDN
TIEDOWN PROVISIONS.
system shall be fully controlled
When option code TDN, ATR,
by means of the conventional
HTR or RTR is specified, the
driving
controls
to
apply
vehicle shall be equipped with
retardation
during
vehicle
four (4) tie down provisions to
deceleration, and to cut it out in
ensure interoperability between
the other operating modes.
transported equipment and tie
TBE
ELEC. TRAILER BRAKE
down devices commonly used in
CONTROL
the transportation environment.
When code TBE is specified, an
Tie down provisions shall
electric trailer brake controller
conform to MIL-STD-209 for
shall be provided. The controller
both Type I and Type II
shall be installed in the truck cab
equipment. The contractor shall
and wired through the lighting
perform a structural analysis of
socket.
The controller shall
the tie down provisions and the
operate on the 12-volt electrical
surrounding structural elements
system of the vehicle and shall
in accordance with MIL-STD 209
include the load control, hand
requirements. In cases when
lever, and accessories.
the structural analysis indicates
the provisions will clearly pass
TBT
TOWING BRAKE CONTROL
the
requirements,
actual
When code TBT is specified, the
physical testing may not be
vehicle shall be provided with a
necessary. In cases where the
system for controlling the brakes
structural analysis indicates the
from a towing vehicle (wrecker).
provisions will marginally pass
The
installation
shall
be
the requirements, redesign or
complete
with
air
brake
testing shall be recommended to
couplers, relay emergency valve
the contractor. In cases where
with
no-bleed-back
feature
the structural analysis indicates
(except when spring applied
the provisions will clearly fail the
emergency brake is furnished),
requirements, a redesign of the
additional air lines and fittings.
provisions shall be required.
The service and emergency
A shipping data plate shall be
couplers shall be mounted on
furnished and shall conform to
the front in a protected position
composition A (class 1 or 2) or
providing for ready attachment
composition C of A-A-50271.
of air hoses from a towing
The shipping data plate shall be
vehicle.
The service and
inscribed
with
a
diagram
emergency couplers shall be
showing
the
tie
down
identified and provided with
attachments, the capacity of
dummy glad-hand couplers with
each attachment, and the
chains. The system shall not
recommended tie down pattern
compromise conformance to any
for securing the equipment
Federal Motor Carrier Safety
during transport. A silhouette of
Regulation referenced herein or
the vehicle showing the center
to any Federal Motor Vehicle
of gravity shall be provided on
Safety Standard.
the
transportation
plate.
Stenciling or other suitable
marking shall identify tie down
Federal Standard 807M
Page 52 of 65
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