CS
ACNS.E.TAWS.020 PDA function requirements
ED Decision 2013/031/R
(See GM1 ACNS.E.TAWS.020)
Provide a Premature Descent Alert function:
(a) to determine if the aeroplane is significantly below the normal approach flight path to a runway and in such a case issue an alert, based on the current position and flight path information of the aeroplane, as determined from a suitable navigation source and airport database;
(b) that is available on all types of instrument approaches including straight-in approaches, circling approaches and approaches that are not aligned within 30 degrees of the runway heading.
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