Civil Aviation Order 20.18 (Aircraft equipment — basic operational requirements) Instrument 2014
5Windshield clear vision equipment
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5 Windshield clear vision equipment
5.1An aircraft with a flight compartment windshield may only be operated under the V.F.R. or the I.F.R. if it has a means of clearing heavy outside precipitation from the windshield at a rate which ensures an unobstructed view for each pilot.
Note I.F.R. is defined in subregulation 2 (1) of CAR 1988.
5.2Paragraph 5.1 does not apply for:
(a) an aeroplane with an MTOW less than 5 700 kg; or
(b) a helicopter with an MTOW less than 2 750 kg maximum;
if the windshield design satisfies CASA that moderate rain will not impair the pilot’s view for take-off, landing or normal flight.