MIL-PRF-5806H
3.3 Design and Construction. The box shall be adaptable to as many different model helicopter
rotor blades as practicable. The blade models shall be specified by the procuring activity (see
6.6).
3.3.1 Blade installation/removal. Each box shall include complete interior supports and
attachments to receive and secure the models or type of blades prescribed by the procuring
activity. Unless otherwise specified, each container shall be accompanied by two sets of
installation instructions. One set of instructions shall be placed in the record receptacle, and the
second set of instructions shall be bonded to the inner wall of the bottom half of the container.
The instructions shall be positioned for easy viewing, and be provided with waterproof protection.
Instructions shall include at a minimum:
a. A step-by-step procedure for installing and removing the blade.
b. An isometric illustration of the blade hub mount, where applicable, with blade mounting
hardware.
c. Torque values for blade mounting hardware, where applicable.
See 4.4.4 for verification.
3.3.1.1 Blade mounting provision. If the design includes a blade mounting provision, it shall
allow the blades to be installed and removed by hand or using common hand tools. It shall take
no more than ten minutes for each operation. The removable portion of the provision shall be
permanently affixed in some fashion to the box (see 4.4.4).
3.3.2 Size. The box shall provide a minimum of 2 inches clearance between the blade and the
interior of the box (see 4.4.5).
3.3.3 Weight. The box shall be of minimal weight consistent with the requirements of this
specification. The box with all components, including the blade mounting provision (if one is part
of the design), shall not exceed five pounds per cubic foot (see 4.4.6).
3.3.4 Center of balance. The container and its components shall be designed so that the center of
balance marking shall be an accurate indication of the true center of balance of the box when
loaded and prepared for shipment. When blades of different lengths are shipped in the same box,
the center of balance markings shall be an average for the different blades. The box shall be stable
when lifted by forklift (see 4.4.7).
3.3.5 Blade protection. The box shall be designed to protect the rotor blade against damage from
shock, vibration, and deterioration normally encountered during storage and shipment. Suitable
means shall be provided to prevent damage to the blade resulting from longitudinal, lateral, or
vertical movement of the blade within the box. The maximum allowable "g" forces imposed on
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