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|  MIL-S-62101C
in SAE J702. All components of the brake system shall be installed in such a manner as to
provide adequate road clearance when traveling over uneven or rough terrain, including objects
liable to strike and cause damage to the brake system components. No part of the brake system
shall extend below the bottom of wheel rims to insure, in case of a flat tire, that the weight of the
semitrailer will be supported by the rim and the flat tire and not be imposed on any component of
the braking system. Slack adjusters and air chambers shall be located above the bottom edge of
the axle carrier.
*
3.11.1 Parking brakes. The semitrailer shall be equipped with spring or air diaphragm
mechanical lock type parking brakes. The parking brakes shall hold the semitrailer, with rated
payload, on a 10 percent grade despite the depletion of the compressed air supply. With no
additional application, the parking brakes shall hold the semitrailer, with rated payload, on a
10 percent incline with the semitrailer headed first up and then down the incline. The parking
brakes shall be automatically applied upon disconnection of the emergency air line and under
emergency conditions. The parking brakes shall conform to Federal Motor Carrier Safety
Regulation 393.41.
*
3.12 Upper fifth wheel. The upper fifth wheel plate shall completely cover a 36 inch
diameter lower fifth wheel when the lower fifth wheel is coupled to the kingpin of the upper fifth
wheel and the semitrailer is turned at all angles. The upper fifth wheel shall conform to Federal
Motor Carrier Safety Regulation 393.70(b).
*
3.12.1 Upper fifth wheel plate. The upper fifth wheel plate shall be not less than
0.250 inch thick for semitrailers up to and including size 20 and not less than 0.375 inch thick for
all larger sizes. The plate shall be reinforced on the upper surface through the use of commercial
steel angles, channels, and ribs. The plate shall include an access hole to permit servicing the
brake connections and electrical connectors when these components are not serviceable from the
top.
*
3.12.2 Pickup plate. A turned up lip pickup plate, compatible with the size (payload) of
the semitrailer, shall be provided as an extension of the upper fifth wheel plate. The pickup plate
shall have a turned up lip not less than 2 inches high. The pickup plate shall extend sufficiently
forward to protect the semitrailer from damage during coupling and uncoupling operations to and
from a truck tractor. The pickup plate shall be integral with the upper fifth wheel plate.
*
3.12.3 Kingpin. A 2-inch diameter kingpin conforming to SAE J700 shall be furnished.
The kingpin shall be fabricated of heat treated alloy steel.
*
3.13 Landing gear. Unless landing supports are specified (see 3.14), elevating landing
gear shall be furnished. The landing gear shall consist of two legs of the vertically retractable,
two-speed type. Both legs shall be operated and controlled by means of a single hand crank.
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