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CS 25.703 Take-off warning system

Available versions for ERULES-1963177438-8671

ED Decision 2003/2/RM found in: CS-25 Amdt 27 - Large Aeroplanes (Jan 2023)

Version Text

CS 25.703 Take-off warning system

ED Decision 2003/2/RM

(See [AMC 25.703](#_DxCrossRefBm1709821140))

A take-off warning system must be installed and must meet the following requirements:

(a) The system must provide to the pilots an aural warning that is automatically activated during the initial portion of the take-off roll if the aeroplane is in a configuration, including any of the following that would not allow a safe take-off:

(1) The wing-flaps or leading edge devices are not within the approved range of take-off positions.

(2) Wing spoilers (except lateral control spoilers meeting the requirements of [CS 25.671](#_DxCrossRefBm1709820687)), speed brakes, or longitudinal trim devices are in a position that would not allow a safe take-off.

(3) The parking brake is unreleased.

(b) The aural warning required by sub-paragraph (a) of this paragraph must continue until –

(1) The take-off configuration is changed to allow a safe take-off;

(2) Action is taken by the pilot to terminate the take-off roll;

(3) The aeroplane is rotated for take-off; or

(4) The warning is manually silenced by the pilot. The means to silence the warning must not be readily available to the flight crew such that it could be operated instinctively, inadvertently, or by habitual reflexive action. Before each take-off, the warning must be rearmed automatically, or manually if the absence of automatic rearming is clear and unmistakable.

(c) The means used to activate the system must function properly for all authorised take-off power settings and procedures, and throughout the ranges of take-off weights, altitudes, and temperatures for which certification is requested.