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|  MIL-W-81752A(AS)
3.5.3 Edge attachments - Transparent plastic windshield elements
may incorporate edge attachments of the laminated-type based on glass
fabric or other suitable textile to reinforce the edges and restrain
crack initiation.
3.5.4 Thermal effects - The transparent materials shall be
securely anchored within the supports but, where feasible, shall be
free to expand and contract with changes in temperature and aging
without distorting the structure, impairing the efficiency of the
joints, or impairing the optical qualities of the panel.
Consideration shall be given to the interaction between transparent
components and frame caused by thermal effects under extreme
temperature conditions to insure that stress concentration in the
transparent components is kept to a minimum.
3.5.5 Loads - The windshield system (transparent materials and
support structure) shall be sufficiently rigid to withstand all flight
loads combined with pressure differential loads from zero up to the
maximum regulator tolerance. The windshield shall also withstand all
landing and handling loads without permanent deformation. Elastic
deformations shall be of magnitudes which wil1 not adversely affect
proper functioning and operation.
3.5.6 Windshield
attachments - Except for electrical heating
elements of thermocouples, accessories or equipment shall not be
attached to the transparent elements of the windshield.
3.5.7 Watertightness - The windshield assembly/system shall meet
the watertightness requirements of MIL-W-6729 and the aircraft detail
specification.
3.5.8 Airtightness - Windshield design shall consider that
pressurized cockpits shall be airtight within the limits of
MIL-E-18927 when the airplane is in flight or with engine(s) running.
3.5.9 Redundant load paths - To avoid catastrophic failures, the
windshield design shall provide multiple load paths whenever
Each load path shall be capable of carrying the
practical.
anticipated applied load such that failure or malfunction of one
It may
component will not be likely to cause a more serious failure.
be necessary to permit elastic deflection in excess of that normally
desired in the event the applied load is carried by a structural
system in which one or more of the redundant load paths is inactive.
The maximum amount of deflection occurring under these conditions
shall not cause further failure or malfunction.
3.6 Strength
requirements
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