13.5.8 A maximum allowable mass marking should
be located within the TLOF and so arranged as to be readable from
the preferred final approach direction, i.e. towards the obstacle-free
sector origin.
13.5.9 The maximum allowable mass marking should
consist of a two- or three-digit number followed by a letter “t”
to indicate the allowable helicopter mass in tonnes (1,000 kg). The
marking should be expressed to one decimal place, rounded to the nearest
100 kg. Where States require that a maximum allowable weight is indicated
in pounds, the marking should consist of a two- or three-digit number
to indicate the allowable helicopter weight in thousands of pounds,
rounded to the nearest 1,000 pounds.
13.5.10 The height of the figures should be 0.9
m with a line width of approximately 0.12 m and be in a colour (preferably
white) which contrasts with the helideck surface. Where possible the
mass marking should be well separated from the installation identification
marking in order to avoid possible confusion on recognition.