JAR 25.773 Pilot compartment view
(a) Non-precipitation conditions. For non-precipitation
conditions, the following apply:
(1) Each pilot compartment must be
arranged to give the pilots a sufficiently
extensive, clear, and undistorted view, to
enable them to safely perform any manoeuvres
within the operating limitations of the
aeroplane, including taxying, take-off,
approach and landing.
(2) Each pilot compartment must be
free of glare and reflection that could interfere
with the normal duties of the minimum flight
crew (established under JAR 25.1523). This
must be shown in day and night flight tests
under non-precipitation conditions.
(b) Precipitation conditions. For
precipitation conditions, the following apply:
(1) The aeroplane must have a means to
maintain a clear portion of the windshield
during precipitation conditions, sufficient for
both pilots to have a sufficiently extensive
view along the flight path in normal flight
attitudes of the aeroplane. This means must be
designed to function, without continuous
attention on the part of the crew, in –
(i) Heavy rain at speeds up to
1·5 VSR1, with lift and drag devices]
retracted; and
(ii) The icing conditions specified
in JAR 25.1419 if certification with ice
protection provisions is requested. (See
ACJ 25.773(b)(1)(ii).)
(2) No single failure of the systems
used to provide the view required by sub-paragraph
(b)(1) of this paragraph must cause
the loss of that view by both pilots in the
specified precipitation conditions.
(3) The first pilot must have –
(i) A window that is openable
under the conditions prescribed in sub-paragraph
(b)(1) of this paragraph when
the cabin is not pressurised, provides the
view specified in that paragraph, and
gives sufficient protection from the
elements against impairment of the pilot’s
vision; or
(ii) An alternate means to
maintain a clear view under the
conditions specified in sub-paragraph
(b)(1) of this paragraph, considering the
probable damage due to a severe hail
encounter.
(4) The openable window specified in
sub-paragraph (b)(3) of this paragraph need not
be provided if it is shown that an area of the
transparent surface will remain clear sufficient
for at least one pilot to land the aeroplane
safely in the event of -(
i) Any system failure or
combination of failures which is not
Extremely Improbable under the
precipitation conditions specified in sub-paragraph
(b)(1) of this paragraph.
(ii) An encounter with hail, birds,
or insects.
(c) Internal windshield and window fogging.
The aeroplane must have a means to prevent
fogging to the internal portions of the windshield
and window panels over an area which would
provide the visibility specified in sub-paragraph
(a) of this paragraph under all internal and
external ambient conditions, including
precipitation conditions, in which the aeroplane is
intended to be operated.
(d) Fixed markers or other guides must be
installed at each pilot station to enable the pilots
to position themselves in their seats for an
optimum combination of outside visibility and
instrument scan. If lighted markers or guides are
used they must comply with the requirements
specified in JAR 25.1381.
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