AMC1 ACNS.E.TAWS.015 FLTA function requirements
ED Decision 2013/031/R
(a) The TAWS lateral search area should be less than the protected area defined by ICAO PANS OPS 8168, volume 2 to prevent nuisance alerts.
Note: The required obstacle (terrain) clearance (ROC) have been used to define the minimum requirements for obstacle/terrain clearance (RTC) appropriate to the FLTA function
(b) As an alternate to the stepped down reduction from the terminal to approach phase in CS ACNS.E.TAWS.015 Table 1 , a linear reduction of the RTC as the aeroplane comes closer to the nearest runway is allowed, providing the requirements of CS ACNS.E.TAWS.015 Table 1 are met.
(c) During the visual segment of a normal instrument approach (typically about 1850 m (1 NM) from the runway threshold), the RTC should be defined/reduced to minimise nuisance alerts.
(d) The RTC values can be reduced slightly for descending flight conditions to accommodate the dynamic conditions and pilot response times.
(e) The FLTA search volume should vary as a function of phase of flight, distance from runway, and the required terrain clearance.
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