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|  MIL-M-81752A(AS)
3.8.8.3 - Rain repellent systems - Approved chemical rain
replellent systems may be used as required to augment air blast or
Designs shall be in accordance with MIL-R-
windshield wiper systems.
81261 and MIL-R-81589.
3.8.9 - Windshield heating elements - The use of heat sources to
keep transparent areas of the windshield free of fog and ice shall not
Surface
cause an uncomfortable temperature rise on the crew:
temperature shall be the minimum required to provide clear vision.
Rate of onset and removal of heat shall be controlled to minimize the
possibility of transparency damage due to thermal shock. Designs
shall be in accordance with MIL-T-5842.
3.8.10 - Windshield washers - Windshield washers in accordance
with MIL-I-18259 shall be provided on all seaplanes and on all other
airplanes whose principle mission will involve low-level search over
water or night carrier operations. The spray pattern shall cover the
The system shall be
"clear area" requirement of 3.8.8.1.1 herein.
capable of removing salt water encrustations over the "clear area" of
The system shall have sufficient capacity to
the windshield.
throughly clean the windshield a minimum of five times. For aircraft
with extended mission times of greater than 4 hours, the system shall
have sufficient capacity to provide for one thorough cleaning every 45
minutes of operation.
When a fluid anti-icing system is incorporated,
the spray distribution system should be common to the washing and
anti-icing systems. (Rain repellent fluid is not compatible with
water-based wash or anti-ice fluids and shall have a separate storage
system.)
3.8.11 - Windshield decreasing - Windshield decreasing shall be
provided in accordance with MIL-I-18259 for all airplanes having a
reciprocating engine installed forward of the pilot s wind-shield.
3.8.12 - Windblast protection - Windblast protection shall be
provided for rear seat occupants of aircraft utiltzing a tandem
cockpit arrangement to permit operation of seat ejection controls or
flight and landing from the rear seat subsequent to an inadvertent
canopy loss.
3.9 - Maintainability
3.9.1 - General - The windshield system shall be designed in
accordance with the qualitative and quantitative maintainability
requirements of MIL-STD-470.
Designs which require special tools for
handling and installation shall be avoided as much as practicable.
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