CS ADR-DSN.M.695 Runway touchdown zone lights

(a)Applicability: Touchdown zone lights should be provided in the touchdown zone of a precision approach runway Category II or III.

(b)Location and positioning:

(1)Touchdown zone lights should extend from the threshold for a longitudinal distance of 900 m, except that, on runways less than 1 800 m in length, the system should be shortened so that it does not extend beyond the midpoint of the runway.

(2)The pattern should be formed by pairs of barrettes symmetrically located about the runway centre line. The lateral spacing between the innermost lights of a pair of barrettes should be equal to the lateral spacing selected for the touchdown zone marking. The longitudinal spacing between pairs of barrettes should be either 30 m or 60 m.

(c)Characteristics:

(1)A barrette should be composed of at least three lights with spacing between the lights of not more than 1.5 m.

(2)A barrette should be not less than 3 m or more than 4.5 m in length.

(3)Touchdown zone lights should be fixed unidirectional lights showing variable white.

(4)Touchdown zone lights characteristics should be in accordance with the specifications in CS ADR-DSN.U.940, Figure U-9.

(5)Touchdown zone lights chromaticity should be in accordance with the specifications in CS ADR-DSN.U.930 and Figure U-1A or U-1B, as appropriate.

[Issue: ADR-DSN/3]

[Issue: ADR-DSN/4]