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MIL-T-62518A
components shall be provided on all rotating parts. Bearing surfaces shall be adequate to resist
torsional moment when inherent within the design. When completely closed booms are
furnished, means shall be provided within the booms to absorb moisture. Booms shall be
provided with inspection openings at critical areas. Booms wrapped for insulation purposes shall
not be acceptable.
3.6.4.2 Boom travel of lower arm. The boom travel of the lower arm shall be a minimum of
80 degrees vertical to the body platform.
3.6.4.3 Boom travel of upper arm. The upper arm boom angular travel for type I vehicles
shall be not less than 125 degrees. Upper boom range of angular travel between booms for
type II vehicles shall be not less than 200 degrees. Cable and sheaves, when furnished, shall be
compatible with each other and shall have sufficient structural strength to meet the performance
requirements specified herein.
3.6.4.4 Boom operation. The rotating turntable and boom assembly shall be hydraulically
actuated by separate mechanisms and shall operate independently, or in any combination of
raising, lowering and rotating at the same time. When in combination, hand metering of the
controls may be necessary. The boom(s) operating mechanism shall be capable of limiting the
lifting capabilities from rest position within safe limits of design stress to prevent overloading.
For testing purposes, means shall be provided in the hydraulic system to perform the overload
tests. Upon completion of all testing, the hydraulic system pressures shall be adjusted to the
manufacturer's recommended setting for the model vehicle furnished. The vehicle shall be
inherently designed or provided with a device to prevent the booms from reaching a position that
would cause the vehicle to become unstable.
3.6.4.5 Boom storage. For normal storage, travel and shipment of the vehicle, the booms
shall fold to essentially horizontal positions in the vertical plane parallel to the longitudinal
centerline of the vehicle. Means shall be provided to hold down the boom assembly and
platform to prevent unactuated raising of the booms when in transit. Saddles and a tiedown
device shall be provided to support and prevent vertical and side movement of the boom and
basket assembly in transit. Boom saddles shall be sufficiently padded to prevent damage to the
booms. Supports shall not interfere with entrance and exit of personnel to and from the body
loadspace. Maximum stowed height shall conform to 3.2.9.
3.6.4.6 Boom cover(s). Boom cover(s) and means to retain cover(s) on insulated sections of
the booms while in stowage or storage-in-transit position shall be provided. The cover(s) shall
completely enclose the insulated arm(s). Provisions shall be made to stow the cover(s) in a
compartment of the body.
39

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