CS
ACNS.E.TAWS.060 Positioning information
ED Decision 2013/031/R
(See AMC1 ACNS.E.TAWS.060)
(a) The positioning information (i.e. horizontal and vertical position, velocity, or rate of information) is provided from an approved positioning source.
(b) For Class B TAWS, GNSS is the only approved horizontal positioning source.
(c) When the TAWS positioning source is the same as the one used by the primary navigation system and provided that, applicable performance requirements are satisfied for navigation, a failure of the TAWS (including loss of electrical power to the TAWS) does not degrade the primary navigation capability.
(d) When a positioning source generates a fault indication or any flag indicating the position is invalid or does not meet performance requirements, the TAWS is to stop utilising that positioning source.
(e) The positioning source for the predictive terrain hazard warning system accuracy is suitable for each phase of flight and/or region of operations.
(f) The TAWS provides indications, as appropriate, regarding degradation or loss of function associated with the loss of the positioning source.
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