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|  MIL-T-62223B(AT)
smooth finish or the bottom half of the panels may be beaded. Sheets shall be overlapped and
double-sealed with Alumelastic sealing compound, and shall be securely riveted to the body
frame members. The roof shall be a one-piece panel of not less than 0.040 inch thick aluminum
or not less than 20 gage (0.0359 inch) hot rolled steel with a rise at the center for efficient
drainage. A drip molding shall be provided around the entire perimeter of the body. The body,
roof and panel joints shall be watertight. The body exterior panels shall be leakproof. All
adjoining surfaces shall prevent entry of water or moisture when exposed to a water spray test
(see 4.3).
3.5.2.2 Wind deflector fairing. A wind deflector fairing shall be attached to the upper
front face of the body, shall be functionally and dimensionally compatible with the air
conditioning unit used, and shall enclose the air conditioning unit. Access panels for use in
operating and maintaining the air conditioning unit shall be provided. The deflector shall have
an aerodynamic fairing shape to direct airflow around the sides and over the top of the body.
The deflector shall have a convex profile in both side and top views, forming a smooth
compound curved surface blending into the rectangular body cross section. The lower edge of
the fairing shall be located as required to minimize drag due to turbulent airflow from the cab.
The fairing construction material shall be molded fiberglass. The structural design of the fairing
and its attachment system shall withstand, without excessive deflection, cracking or failure in the
fairing or body structure, all applied loads, vibrations, and environmental conditions normally
associated with a five-year commercial service life. Design operational limits shall include
forward vehicle speeds of 60 mph during wind gusts of 60 mph from any direction. The wind
deflector shall not interfere with tilting the cab.
3.5.2.3 Doors. Entrance and emergency doors shall be aluminum faced plywood core,
one piece molded fiberglass plastic laminate construction, or pan-type, constructed of 0.125 inch
aluminum, with aluminum tube reinforcement. Doors shall be insulated and shall close on
dust-sealing neoprene extrusions. Doors shall include safety glass window with removable
curtains, and a double-acting door latch with keyed locks. Chromed grab handles shall be
provided at door entrances. The entrance door shall be provided with a securing device to hold it
in open position. The entrance door shall have an inset stepwell with a hinged aluminum cover
equipped with non-skid safety tread, with pull-out steps under the stepwell. A foldout step shall
be provided at the emergency door. All steps shall be capable of withstanding repeated loads up
to 250 pounds. The emergency door shall be provided at the curbside within the Laboratory
Area and the entrance door shall be on the curbside near the front.
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