MIL-S-62549 Semitrailer, Low Bed, 40 Ton Nominal Payload For Transportation Of Heavy Engineer Construction Equipment, M870A2This specification covers a level frame, low bed semitrailer equipped with a folding gooseneck for front loading and movement of heavy engineer construction equipment.

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MIL-S-62549(AT)

4.7.29 Transportability provision check. To determine conformance to 3.4.17, 3.4.17.1, and

3.4.17.4, each semitrailer, less payload, shall be checked for proper installation and location of lift points, vehicle tiedown, and markings as specified.

4.7.29.1 Transportability provisions. To determine conformance to 3.4.17 through 3.4.17.4, the semitrailer, with rated payload, shall be subjected to sling, tiedown, and lifting requirements as specified.

4.7.30 Turning ability test. To determine conformance to 3.5.2, the trailer combination shall be operated as specified and checked for specified turning angle in both directions and observed for interference with the prime mover and damage to the trailer or prime mover. The required load is specified by the test performed.

4.7.31 Tracking ability test. To determine conformance to 3.5.6, the semitrailer shall be tested according to specified requirements.

4.7.32 Articulation test. To determine conformance to 3.4.13.5, the axle and suspension system, with payload specified by the test performed, shall be tested for specified requirements.

4.7.33 Dimension and clearance inspection. To determine conformance to 3.4.1, 3.4.1.1,

3.4.10, 3.4.11, and 3.4.11.1, the semitrailer shall be inspected for specified requirements.

4.7.34 Rear and side loading test. To determine conformance to 3.5.8, a vehicle as specified in the contract, shall be rear end loaded and also side loaded with a semitrailer adjacent to earth ramps as specified. Any damage to the semitrailer or truck-tractor during loading or failure of the semitrailer to permit loading of the vehicle shall be cause for rejection. No other aids to the semitrailer other than specified earth ramps shall be used.

4.7.35 Front loading test. To determine conformance to 3.4, 3.4.7, and 3.5.7, loading requirement, a vehicle as specified in the contract shall be front loaded with the semitrailer gooseneck unfolded flat to the ground as specified. Any damage to the semitrailer during loading for failure of the semitrailer to permit loading of the vehicle shall be cause for rejection.

4.7.36 Climatic tests. To determine conformance to 3.2.2, semitrailer(s) shall be tested for specified requirements.

4.7.37 Compatibility test. To determine conformance to 3.2.1, the semitrailer(s), with specified payload, shall be tested for conformance to requirements 3.4, 3.4.1, 3.4.1.1, 3.4.21,

3.5.8 and 6.1 with each truck-tractor specified. Each truck-tractor and semitrailer combination shall be weighed to assure that the truck-tractor specifications are not exceeded. Each

truck-tractor specified shall be used to accomplish the mileages required for each test semitrailer(s). The test mileages will be divided equally between truck-tractors. Each

truck-tractor shall furnish the test semitrailer with 24V electrical power for 50% of its allotted mileage and 12V electrical power for the remainder of its allotted mileage.