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|  MILT81821
shipment purposes. When partial disassembly of the trainer for shipment purposes is required,
appropriate disassembly instructions shall reincluded in the trainer MOMl specified in 3.4.2.
3.3 Design and Construction
3.3.1 Materials, processes and parts.
Specifications and standards for all materials and
parts, and Government certification and approval of the processes and equipment that are not
specifically designated herein and that are necessary for the execution of this specification, shall be
selected in accordance with MILSTD143 and 3.3.1.9.
3.3.1.1 Panel materials.
All panels shall be durable, hard surfaced, relatively rigid
structures. Plywood, aluminum bonded plywood, balsa sandwich board, honeycomb (metal, plastic,
or cardboard), or other lightweight materials may be used for paneling, except that metallic surfaces
shall not be used for electrical or avionics trainers. The choice of material shall be based on specific
needs of the particular trainer, economy, local manufacturing techniques, or like criteria. If the
panel material is plywood, it shall conform to the requirements of NN-P530 for Type I exterior
fully waterproof bond plywood. Any splice made in unsupported areas shall be further reinforced
by plywood gusset plates or hardwood ribs to such an extent that original plywood strength will be
restored. All paneling or laminated material used in the construction of the trainer panels shall be
edged with a material entirely suitable for the purpose, such as aluminum, stainless steel, plastic, or
nonconductive channel/angle on all exposed edge surfaces. Where electrical potential hazards exist,
nonconductive materials shall be used.
The type of material and method of fabrication for trainer panel
3.3.1.2 Frame materials.
frames shall be indicated in the appropriate trainer description in the Detail Specification. The
shape and size of the frame will be predicated on structural requirements and minimization of cost
and weight. Trainer frames shall be constructed from round, rectangular, square, angular formed, or
extruded metal. Vertical frame members shall be supported by braces welded or bolted to the
vertical and horizontal frame members.
3.3.1.2.1 Skid materials.
When wooden skids are specified in the Detail Specification,
materials used to fabricate the skids shall be selected from the most practical grade A commercial
hardwoods available (i.e., oak, maple, birch, etc.), taking into consideration splintering, splitting
characteristics, and durability.
When materials that are subject to deterioration
3.3.1.3 Finish and protective coatings.
during service usage are used in the construction of the trainer panels, they shall be protected
against such deterioration in a manner that will in no way prevent compliance with the performance
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