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|  MIL-W-81752A(AS)
3.3 Aerodynamic shape - The exact shape of the windshield shall
include an optimum combination of all design requirements, but in no
case shall the normal angle of incidence to the surface exceed 60
The contour of the windshield shall not be so abrupt that it
degrees.
would create a distorted effect for binocular vision nor should there
be abrupt changes in contour or thickness between adjacent transparent
panels which would allow differences in angular deviation and
subsequent image shift.
3.4 Structural
arrangement
3.4.1 Structural frames - Structural frames which affect vision
from the cockpit shall be arranged to avoid gunsight and optical
landing aids viewing areas.
Windshield structural frames shall also
conform to the requirements of MIL-STD-850 with regard to size and
vision impairment limitations.
3.4.1.1 Configuration - The use of a one piece wrap-around type
windshield for fighter/attack aircraft using a single pilot
configuration is desired to maximize external vision.
3.4.2 Joints - Detail design of joints between the windshield and
the openable section shall insure that distortion due to crash
loadings will not cause mechanical interlocking and hangup which will
preclude forceable opening or jettisoning of the canopy for emergency
escape or rescue.
3.4.3 Crew clearance - Crew clearance envelopes and equipment
space requirements shall be coordinated with the aerodynamic shape of
the windshield.
3.5 Structural
design
3.5.1 Nonmagnetic material - All parts within 24 inches of the
magnetic compass shall be of nonmagnetic material.
3.5.2 Windshield Material - Material selection for windshield
transparencies will be based on a trade study that has evaluated, at a
minimum, the following requirements as defined in the aircraft detail
specification: flight envelope, cockpit arrangement, service life,
ingress/egress/escape considerations, bird impact, survivability,
reliability, and maintainability.
When bullet resistant glass is
used, it shall conform to the requirements of MIL-G-5485.
When
as-cast acrylic is used, it shall conform to the requirements of
MIL-P-8184.
When stretched acrylic is used, it shall conform to the
requirements of MIL-P-25690. When polycarbonate material is used, it
shall conform to the requirements of MIL-P-83310. The material(s)
selected shall be submitted to the procuring activity for approval.
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