MIL-PRF-62321D
3.1.1.11 Brake lights. At least one pair of brake lights shall override the four-way
emergency flasher. Modifications to the manufacturer's standard product to accommodate
this requirement shall not compromise conformance to any Federal Motor Carrier Safety
Regulation referenced herein or to any Federal Motor Vehicle Safety Standard. If additional
lights are added to the vehicle, the lights shall be selected from the chassis manufacturer's
standard matching hardware.
3.1.1.12 4x4 conversion. The chassis manufacturer's standard 4x2 truck chassis may
be modified to provide all wheel drive conforming to the requirements specified herein if:
a. The conversion axle manufacturer's engineering department specifically
approves and certifies that all such modifications meet the design requirements
and standards of the conversion axle manufacturer.
b. The chassis manufacturer's front axle before conversion has the same load
rating as the conversion axle to be installed.
c. Components used in the all wheel drive conversion are of current production.
d. Components used in the all wheel drive conversion are approved for the
conversion application by the component manufacturers.
e. The converted vehicle conforms to Federal Motor Vehicle Safety Standard,
Title 49, Part 571, Safety Standard No. 121.
f. Replacement headlights, if required to be added to meet the height
requirements of Federal Motor Vehicle Safety Standard, Title 49, Part 571,
Safety Standard No. 108, are equivalent in mounting, protection, and range
and precision of adjustment to the chassis manufacturer's original standard
headlights.
g. Unused headlight cavities are covered in a neat workmanlike manner, treated
and painted to match the chassis cab color with treatment and painting
equivalent to the chassis cab manufacturer's process for the remainder of the
chassis cab. Cavities and their covers shall be rustproofed in accordance with
3.1.1.2.
h. Complete installation drawings are made available to procurement after award
of the contract.
3.2 General design.
3.2.1 Federal Motor Vehicle Safety Standards. The vehicle and furnished accessories
shall comply with all Federal Motor Vehicle Safety Standards in effect on the date of
manufacture.
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