CS ACNS.E.TAWS.020 PDA function requirements

• ED Decision 2013/031/R found in: GM Remote Aerodrome Air Traffic Services (ED 2019/004/R) Issue 2 (Jul 2020)

CS ACNS.E.TAWS.020 PDA function requirements ED Decision 2013/031/R (See [GM1 ACNS.E.TAWS.020](#_DxCrossRefBm573002825)) 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.