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| MIL-T-18232B(AS)
3.1.20.10
ADHESIVE BONDED, REINFORCED PLASTIC, AND FOAMED-IN-PLACE
CONSTRUCTION. - All adhesive-bonded construction including
reinforced plastic, sandwich, and foamed-in-place core construction shall be in
accordance with contractor-prepared NAVAIR approved process specifications. The
approval of such process specifications and the specific approval of the use of
the materials for such construction shall be based on the demonstrated suitability
of the materials and processes for the intended operating environments. A program
shall be proposed for acceptance to develop reliable materials properties suitable
for use in structural design, and consisting of structural tests to substantiate
the adequacy of the properties and processes when used in the design and con-
struction of prototype composite structures in all respects representative of
production design and construction.
3.l.20.l0.l
METAL CONSTRUCTION. - Aeronautical surfaces and body shall
generally be of riveted construction except as otherwise
specified herein or approved by NAVAIR and except that resistance welding may be
used at locations other than the junction of main load carrying members. Bolts
or screws may be used in parts of the above structures that are inaccessible for
riveting operations, to secure structural parts to each other and to secure
structural fittings to the target structure.
Metals in immediate contact that tend to activate electrolytic
corrosion in the presence of salt water shall be avoided.
Where the use of such metals in immediate contact cannot be avoided, particular
care shall be given to the insulation of such parts as specified in Spec MIL-F-7179.
The design of struts and welded tube structures, where practi-
cable, shall provide for airtight closure by welding. This
is particularly applicable to steel struts and tube structures which maybe
welded easily. Cases in which doubt exists as to the practicability of sealing
steel members may be referred to NAVAIR for decision. Mere convenience of fabri-
cation is not sufficient reason for not sealing steel tubes. End fittings used
with open tubing shall be so designed that they do not form pockets which may
collect moisture. Cork seals, dams, and metal end plugs machined to fit, shall
not be used.
3.1.20.2
WOOD CONSTRUCTION. - Wood construction shall be in accordance
with Bulletins ANC-18 and ANC-l9. Wood in contact with metal
shall be avoided if practicable. Where the use of such parts in immediate con-
tact cannot be avoided, suitable insulating material shall be provided between
the surfaces of the wood and metal parts. The requirements of the paragraph do
not apply to sandwich construction.
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