MIL-DTL-85405A(AS)
3.3 Performance requirements.
3.3.1 Functioning. The trailer shall be examined for proper functioning of wheels, brake
systems, and electrical systems (see 4.5.2).
3.3.2 Proof load. The trailer, when supported by its running gear, shall withstand a proof
load of 8,000 (+100, -0) pounds when subjected to the overload test specified in 4.5.5.1
3.3.3 Brake system.
3.3.3.1 Parking brakes. The parking brakes shall hold the trailer, loaded with a 4,000 (+100,
-0) pound test load, on a 15° grade in either direction, front or rear when subjected to the test
specified in 4.5.3.1.
3.3.3.2 Service brakes. The service brakes shall stop the trailer, loaded with a 4,000 (+100,
-0) pound test load, within 30 feet when traveling at 20 miles per hour, on level, dry concrete
when subjected to the test specified in 4.5.3.2.
3.4 Towing force. The towing force required to move the trailer from rest on a smooth, dry,
level, paved surface, such as brushed concrete, shall be not greater than 50 pounds per ton of
maximum gross weight, measured at the drawbar when subjected to the test specified in 4.5.4.
3.5 Mobility. The trailer shall be subjected to and pass the road tests (see 4.5.6.1), the
maneuverability test (see 4.5.6.2), and the side slope test (see 4.5.6.3).
3.6 Workmanship. The trailer, including all parts and accessories, shall be constructed to
ensure that appearance, fit, and adherence to specified tolerances shall be within design
limitations. Equipment having missing, inoperative, defective, bent, broken, or otherwise
damaged parts, shall not be acceptable. The installation of hardware parts, such as catches, pins,
handles, nuts, bolts, shall not damage the hardware or the mounting surface. Hardware or
mounting surfaces damaged in this way shall be touched up to provide a continuous protective
coating. Screws, nuts, and bolts showing cross threading, mutilation, detrimental or hazardous
burrs shall not be acceptable. Insulated wires shall be formed into cables or ducted. Wires,
cables, and brake lines shall be routed, positioned, and protected to avoid contact with rough or
irregular surfaces and sharp edges. All welds shall be free of harmful defects such as cracks,
porosity, undercuts, voids, and gaps. There shall be no evidence of burn through. Fillets shall be
uniform and smooth. Angular or thickness misalignment, warpage, or dimensional change due to
heat from the welding operation shall be within permitted tolerances. There shall be no damage to
adjacent parts resulting from welding.
3.7 Marking. Marking for shipment shall be in accordance with MIL-STD-129.
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