CS 25.672 Stability augmentation and automatic and power-operated
systems
ED
Decision 2020/001/R
If the
functioning of stability augmentation or other automatic or power-operated
systems is necessary to show compliance with the flight characteristics
requirements of this CS-25, such systems must comply with CS 25.671
and the following:
(a) A warning, which is clearly
distinguishable to the pilot under expected flight conditions without
requiring his attention, must be provided for any failure in the stability
augmentation system or in any other automatic or power-operated system, which
could result in an unsafe condition if the pilot were not aware of the
failure. Warning systems must not activate the control systems.
(b) The design of the stability augmentation
system or of any other automatic or power-operated system must permit initial
counteraction of failures of the type specified in CS 25.671(c) without
requiring exceptional pilot skill or strength, by either the deactivation of
the system, or a failed portion thereof, or by overriding the failure by
movement of the flight controls in the normal sense.
(c) It must be shown that after any single
failure of the stability augmentation system or any other automatic or
power-operated system:
(1) The aeroplane is safely controllable when
the failure or malfunction occurs at any speed or altitude within the approved
operating limitations that is critical for the type of failure being
considered.
(2) The controllability and manoeuvrability
requirements of this CS-25 are met within a practical operational flight
envelope (for example, speed, altitude, normal acceleration, and aeroplane
configurations) which is described in the Aeroplane Flight Manual; and
(3) The trim, stability, and stall
characteristics are not impaired below a level needed to permit continued safe
flight and landing.
[Amdt
25/18]
[Amdt
25/24]
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