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)

4.7.8.1  Brake operation test.  To determine conformance to 3.4.14 and 3.4.14.1, the semitrailer service brakes, parking brake and emergency brakes and air lines shall be operated to assure operation to specified requirements.  The 10% slope is not required for this test.  Air leaks are no allowed.

4.7.8.2  Brake system test.  To determine conformance to 3.4.1.4 through 3.4.14.3, and 3.5.5, the brake system and air lines shall be operated and tested to assure operation to specified requirements.  Air leaks are not allowed.

4.7.9  Kingpin check.  To determine conformance to 3.4.11, the kingpin shall be checked for proper installation and conformance to specified requirements.

4.7.10  Upper fifth wheel plate check.  The upper fifth wheel plate shall be checked for proper installation and conformance to requirements specified by 3.4.11.1.

4.7.11  Lift fitting check.  The lift fitting shall be checked for proper installation and conformance to requirements specified by 3.4.21.

4.7.11.1  Lift fitting test.  The lift fitting shall be tested for conformance to the requirements specified by 3.4.21.

4.7.12  Frame check.  To determine conformance to 3.4.4, 3.4.5, and 3.4.6, the frame shall be checked for proper construction, as specified.  Welds shall be visually checked to the free of slag, spatter, undercut porosity, lack of fusion, cracks, and other similar defects.

4.7.12.1  Frame test.  The frame shall be tested, to determine conformance to 3.2.3.1, 3.4.4,

3.4.5, and 3.4.6.

4.7.13  Storage area check.  To determine conformance to 3.4.10, the storage area shall be checked for the requirements specified.

4.7.14  BII check.  The BII shall be checked to determine conformance to the requirements specified by 3.4.2 through 3.4.2.3.

4.7.15  Reserved.

4.7.16  Floor.  To determine conformance to 3.4.8, flooring shall be checked for proper installation and conformance to specified requirements.

4.7.17  Stake pockets.  To determine conformance to 3.4.18, stake pockets shall be checked for proper construction, installation, and conformance to specified requirements.

4.7.18  Outriggers.  To determine conformance to 3.4.19, the outriggers shall be checked for proper operation, construction, and conformance to specified requirements.

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