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|  MIL-W-81752A(AS)
3.8.8 - Rain removal - Windshield system design shall include
provisions to insure visibility while flying through rain of 4 inches
per hour in accordance with MIL-R-81367. System functioning shall be
proven by test. The rain removal and repellent system shall
provide clear vision for taxing, takeoff, approach, landing, inflight
refueling, and level flight at 1.6 times the stall speed at maximum
For carrier-based aircraft, a
weight with flaps and gears retracted.
clear view of landing aids shall be provided during the entire carrier
approach operation.
3.8.8.1 - Windshield wipers - Specifications for electrically
operated windshield wipers shall be provided by the prime aircraft
contractor in accordance with 3.1.1.1 herein. Designs shall include
provisions to prevent the possibility of damage to transparencies by
aerodynamic buffeting, abrasion, and to eliminate vision obstruction
by the wiper when stowed. Adequate strength and rigidity shall be
provided to prevent possible loss of blades, arms, or other components
Wipers shall not be used on panels in
during all flight conditions.
Hydraulic
which the outer ply is susceptible to scratching.
windshield wipers shall not be used.
3.8.8.1.1 - Wiper clearance envelope - The limits of the required
clear area on the external surface of the windshield panel(s) shall be
determined with respect to the pilot's (co-pilot's) design eye
The minimum upper limit of the clear area shall be defined
position.
by the external intersection of the windshield panel(s) and a
horizontal plane passing through the pilot's (co-pilot's) eye position
with the aircraft at maximum expected nose-down attitude during
approach and landing. The minimum transverse extent of the clear area
shall be defined by the external intersection of the windshield
panel(s) and two vertical planes passing through and measured from the
pilot's (co-pilot's) eye position, one 13 degrees horizontally to the
left and one 13 degrees horizontally to the right. The lower limit of
the clear area shall be defined by the lower extent of the windshield
panel(s) or the upper limit of intervening structure as viewed from
the pilots (co-pilot's) eye position.
3.3.8.2 Air Blast sytems - Designs utilizing air blast systems
shall be in accordance with requirements of MIL-R-81367. A
minimum flowrate of 7 pounds per minute per inch of nozzle length and
sonic flow through nozzles shall be maintained at all conditions where
A tapered coverging slot type nozzle is
rain removal is required.
A normally closed shutoff valve that will fail closed
preferred.
shall be provided in the air blast supply line to each cleared
Airflows to both windshields in side by side cockpit
windshield.
aircraft must not be lost due to failure of a flow control or pressure
regulating device.
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