CS HPT-DSN.F.690 Touchdown and lift-off area lighting system

(a)Applicability:

(1)A TLOF lighting system should be provided at a heliport intended for use at night.

(2)The TLOF lighting system for a heliport should consist of one or more of the following:

(i)perimeter lights; or

(ii)floodlighting; or

(iii)ASPSL or LP lighting to identify the TLOF when (i) and (ii) are not practicable and FATO lights are available.

(b)Location:

(1)TLOF perimeter lights should be placed along the edge of the area designated for use as the TLOF or within a distance of 1.5 m from the edge.

(2)Where the TLOF is a circle, the lights should be:

(i)located on straight lines in a pattern which should provide information to pilots on drift displacement; or

(ii)evenly spaced around the perimeter of the TLOF at the appropriate intervals, sufficient to present the pattern, except that over a sector of 45 degrees, the lights should be spaced at half spacing.

(3)TLOF perimeter lights should be uniformly spaced at intervals of not more than 5 m.

(4)Where TLOF perimeter lights are located on straight lines, there should be a minimum number of four lights on each side, including a light at each corner.

(5)For a circular TLOF, where lights are installed in accordance with paragraph (2)(ii) above, there should be a minimum of fourteen lights.

(6)Where ASPSL or LPs are provided to identify the TLOF, which is not a circle, they should be placed along the marking designating the edge of the TLOF.

(7)Where ASPL or LPs are provided to identify the TLOF, which is a circle, they should be located on straight lines circumscribing the area.

(8)The minimum number of LPs on a TLOF should be nine.

(9)The total length of LPs in a pattern should not be less than 50 per cent of the length of the pattern.

(10)There should be an odd number of LPs with a minimum number of three panels on each side of the TLOF, including a panel at each corner.

(11)LPs should be uniformly spaced with a distance between adjacent panel ends of not more than 5 m on each side of the TLOF.

(12)TLOF floodlights should be located so as to avoid glare to pilots in flight or to personnel working on the area.

(13)The arrangement and aiming of floodlights should be such that shadows are kept to a minimum.

(c)Characteristics:

(1)The TLOF perimeter lights should be fixed omnidirectional lights showing green.

(2)ASPSL or LPs should emit green light when used to define the perimeter of the TLOF.

(3)The chromaticity and luminance of colours of LPs should be in accordance with the specifications in CS ADR-DSN.U.935.

(4)An LP should have a minimum width of 6 cm. The panel housing should be the same colour as the marking it defines.

(5)The perimeter lights should not exceed a height of 25 cm and should be inset when a light extending above the surface could endanger helicopter operations.

(6)When located within the safety area of a heliport, the TLOF floodlights should not exceed a height of 25 cm.

(7)The LPs should not extend above the surface by more than 2.5 cm.

(8)The light distribution of the perimeter lights should be as shown in Figure F-9, Illustration 5.

(9)The light distribution of the LPs should be as shown in Figure F-9, Illustration 6.

(10)The spectral distribution of TLOF area floodlights should be such that the surface and obstacle marking can be correctly identified.

(11)The average horizontal illuminance of the floodlighting should be at least 10 lux, with a uniformity ratio (average to minimum) of not more than 8:1 measured on the surface of the TLOF.

(12)The lighting used to identify the touchdown marking should comprise a segmented circle of omnidirectional ASPSL strips showing yellow. The segments should consist of ASPSL strips, and the total length of the ASPSL strips should not be less than 50 per cent of the circumference of the circle.

(13)If utilised, the heliport identification marking lighting should be omnidirectional showing green.