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| MIL-T-18232B(AS)
3.1,20.10.3
METAL COVERING. - The external skin of all parts of the target
shall support all loads without buckling that will effect
adversely the aerodynamic characteristics. The skin of wings in the slip stream
shall be of sufficient gage or sufficiently stiffened to prevent fatigue failure
due to slipstream action or vibration. The required contour of the external skin
shall be maintained after riveting, welding, or any other fabricating process.
If necessary, joints in the external metal skin shall be stiffened or shall be
located in the immediate vicinity of stiffeners. Reinforcing material shall be
incorporated around all cutouts in stressed material of the structure.
3.1.20.10.4
WOOD AND FABRIC COVERING.- Neither wood or fabric shall be
used for external covering,
3.1.20.10.5
CONTROL-SURFACE COVERING. - The covering of control surfaces
(ailerons, elevators, rudders, tabs, etc.), in addition to
possessing strength capable of withstanding the loads imposed in the design con-
ditions specified for the target, shall have rigidity sufficient to limit the
deflections resulting from such design loads to magnitudes which will not affect
adversely the aerodynamic characteristics of the control surface or of the fixed-
movable surface combination. The pressures for use in design shall be not less
than those determined from the spanwise and chordwise load distribution used in
the target structural calculations as modified by the internal pressures due to
venting of the surfaces, determined either analytically or from applicable test
data. The determination of these design pressures shall properly take into
account the effects of compressibility at high airspeeds as regards both magnitude
and distribution of pressures.
3.1.20.11
CASTINGS. - Castings are permitted for both structural and
nonstructural applications.
3.1.20.12
FITTINGS. - Structural fittings for targets shall be made from
aluminum, or steel within the limitations imposed in this
specification or other applicable specifications. Connections of solid end-fittings
to struts using aluminum alloy rivets shall be designed for possible replacement
by rivets of the next larger size. Iron and steel rivets or bolts maybe substi-
tuted for aluminum alloy rivets subject to release by NAVAIR, provided they are
finished in accordance with Specification MIL-F-7179.
3.1.20.13
BEARINGS. - Bearings in flight control system shall be in
accordance with Specification MIL-F-18372. Hinges on movable
surfaces and moving parts of the control system shall be provided with suitable
type bearings, the friction of which, together with the aerodynamic loads, will
not cause control moments higher than the capacity of the control actuating
mechanisms. hearings with thrust loads not greater than 5% of the radial load,
may be fastened by staking or spinning. Special attention shall be given to the
number and location of bearings for hinges on control surfaces in order that
binding will not occur due to distortion of the surfaces.
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