CS 25.773 Pilot compartment view

ED Decision 2016/010/R

(See AMC 25.773)

(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 taxiing, 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 CS 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 V_SR1, with lift and drag devices retracted; and

(ii)     The icing conditions specified in Appendix C and the following icing conditions specified in Appendix O, if certification for flight in icing conditions is sought (See AMC 25.773(b)(1)(ii)):

(A)     For aeroplanes certificated in accordance with CS 25.1420(a)(1), the icing conditions that the aeroplane is certified to safely exit following detection.

(B)               For aeroplanes certificated in accordance with CS 25.1420(a)(2), the icing conditions that the aeroplane is certified to safely operate in and the icing conditions that the aeroplane is certified to safely exit following detection.

(C)     For aeroplanes certificated in accordance with CS 25.1420(a)(3), all icing conditions.

(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 a window that:

(i)      is openable under the conditions prescribed in sub-paragraph (b)(1) of this paragraph when the cabin is not pressurised;

(ii)     provides the view specified in (b)(1); and

(ii)     gives sufficient protection from the elements against impairment of the pilot’s vision

(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 in accordance with CS 25.1309, under the precipitation conditions specified in sub-paragraph (b)(1) of this paragraph.

(ii)     An encounter with severe hail, birds, or insects. (See AMC 25.773(b)(4))

(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. (See AMC 25.773(c))

(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 CS 25.1381.

[Amdt No: 25/3]

[Amdt No: 25/4]

[Amdt No: 25/16]

[Amdt No: 25/18]