attachment 2 section i ? technical specifications commuter coach ...

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ATTACHMENT 2
Reinforced fiberglass and plastic materials shall be excluded from structural body construction, except
for replaceable panels or doors and for non-load bearing front and rear roof caps and the front lower
panel below the windshield and the A-pillar covers and transom panels.
2.7.5 CORROSION
The coach shall resist corrosion from atmospheric conditions and road salts. It shall maintain structural
integrity and nearly maintain original appearance throughout its service life, provided it is maintained in
accordance with the procedures specified in the service manual. All exposed body panels above and
below the floor line shall be aluminum or stainless steel except for the front end upper and lower
panels, the rear end upper panels and the upper sidewall galvanized panel which are made of fiberglass
or galvanized steel. Materials exposed to the elements and all joints and connections of dissimilar
metals shall be corrosion-resistant and shall be protected from galvanic corrosion. Bidders proposing
steel tubing for frame construction are required to use stainless steel tubing of comparable cross section.
Proposals shall contain the manufacturer’s complete corrosion protection plan including a specific
identification and illustration of structural and exterior material and their relative corrosion resistance.
All frame members below the passenger floor that are subject to road splash and are less than .10 inch
shall be stainless steel for maximum corrosion protection. All other frame members exposed to splash
are to be High Strength Low Alloy steel and are to be .10 inch thick minimum and shall be coated with
Tectyl 127CG on all surfaces exposed to road splash for maximum corrosion protection.
Plywood floor supports in the passenger and drivers area, the sidewall structures and roof structures that
are not exposed to road spray shall be High Strength Low Alloy and primed prior to incorporation into
the coach assembly.
The floor supports and sidewall components shall be painted with a suitable finish coat.
Outer sidewall panels above the passenger floor and below the windows shall be galvanized steel,
galvanized inside and preprimed outside. The roof panels shall be preprimed aluminum both sides and
the front and rear roof caps fiberglass.
The upper rear engine door and louvers may be made of fiberglass.
The wheelchair lift door may be made of an aluminum frame or other acceptable lightweight material
and aluminum exterior panel.
Non-structural underbody panels used for baggage bay floors and to retain insulation in other areas,
shall be Tectyl coated aluminum or stainless steel for maximum corrosion protection. In the wheelwell
areas, non-structural closeout panels shall be stainless steel.
Before assembling, all metal body parts must be given a thorough anti corrosion treatment. Joints
between dissimilar metals shall be properly insulated with an inert plastic tape to avoid corrosion due to
electrolytic action. All nuts, bolts, clips, washers, clamps, and like parts shall be zinc or cadmium
plated, phosphate coated, black oxide coated, stainless steel, or nylon to prevent corrosion. All exterior
joints and seams must be sealed.