CS ACNS.E.LAD.320 Flight dynamics and locating the aircraft

(a)     Based on detailed assumptions about the minimum performance of the communication infrastructure, it is demonstrated that:

(1)     if the system transmits activation signals before or without deploying any equipment:

(i)      the activation signals and the deactivation signals are transmitted in such a manner that the communication infrastructure detects these signals at all possible values of aircraft pitch attitude, aircraft roll attitude, aircraft altitude, and aircraft speed, as well as at all possible rates of change of these parameters within the normal flight envelope;

(ii)     the following is not adversely affected on accident flight trajectories with parameter values within the ranges of Table 1 of this CS:

(A)     performance of the automatic activation of the system;

(B)     performance of the transmission of the activation signals by the system;

(C)     detection of the activation signals by the communication infrastructure; and

(D)     position accuracy of the point of end of flight that is required for non‑survivable accidents; and

(iii)     the position accuracy of the point of end of flight that is required for survivable accidents is achieved on typical flight trajectories of survivable accidents;

(2)     if the system transmits activation signals from deployable equipment:

(i)      the deployable equipment has at least the same performance as an ADFR with regard to deployment, activation, and crashworthiness of the transmitter;

(ii)     unless the system transmits before deployment activation signals that are sufficient to achieve the position accuracy for non-survivable accidents, the crash testing specifications of the transmitter in the deployable equipment and the deceleration properties of the deployable equipment are such that the transmission of activation signals is not adversely affected by impact shock forces that are representative of deployment during a non-survivable aircraft collision with terrain;

(iii)     the communication infrastructure detects the activation signals of the deployable equipment when that equipment is deployed and not moving; and

(iv)     the communication infrastructure detects the activation signals and deactivation signals when the aircraft stands on its landing gears and no equipment is deployed; and

(3)     the performance specified in (1) or (2), as applicable, is achieved at any location.

(b)     Documentation is prepared, which demonstrates the minimum performance of a communication infrastructure that is required for complying with (a).

Table 1 — Parameter ranges for typical accident flight trajectories