CS ADR-DSN.B.205 Radio altimeter operating area

(a)A radio altimeter operating area should be established in the pre-threshold area of a precision approach runway Category II and III, and where practicable, in the pre-threshold area of a precision approach runway Category I.

(b)Length of the area: A radio altimeter operating area should extend before the threshold for a distance of at least 300 m.

(c)Width of the area: A radio altimeter operating area should extend laterally, on each side of the extended centre line of the runway, to a distance of 60 m, except that, when special circumstances so warrant, the distance may be reduced to no less than 30 m if a safety assessment indicates that such reduction would not affect the safety of operations of aircraft.

[Issue: ADR-DSN/3]