333
Federal Aviation Administration, DOT
Pt. 60, App. D
4.c.
.........................
Surface contrast ratio
....
Not less than 5:1
..........................
N/A
..........................
.
The ratio is calculated by dividing
the brightness level of the cen-
ter, bright square (providing at
least 2 foot-lamberts or 7 cd/
m
2
) by the brightness level of
any adjacent dark square.
X
Measurements may be
made using a 1
°
spot
photometer and a raster
drawn test pattern filling
the entire visual scene
(all channels) with a test
pattern of black and
white squares, 5 per
square, with a white
square in the center of
each channel. During
contrast ratio testing,
simulator aft-cab and
flight deck ambient light
levels should be zero.
4.d.
........................
Highlight
brightness
.......
Not less than three (3) foot-lam-
berts (10 cd/m
2
).
N/A
...........................
Measure the brightness of the
center white square while
superimposing a highlight on
that white square. The use of
calligraphic capabilities to en-
hance the raster brightness is
acceptable, but measuring light
points is not acceptable.
X
Measurements may be
made using a 1
°
spot
photometer and a raster
drawn test pattern filling
the entire visual scene
(all channels) with a test
pattern of black and
white squares, 5 per
square, with a white
square in the center of
each channel.
4.e.
........................
Surface
resolution
.........
Not greater than two (2) arc min-
utes.
N/A
...........................
An SOC is required and must in-
clude the relevant calculations.
X
When the eye is positioned
on a 3
°
glide slope at the
slant range distances in-
dicated with white run-
way markings on a black
runway surface, the eye
will subtend two (2) arc
minutes: (1) A slant
range of 6,876 ft with
stripes 150 ft long and 16
ft wide, spaced 4 ft apart.
(2) For Configuration A; a
slant range of 5,157 feet
with stripes 150 ft long
and 12 ft wide, spaced 3
ft apart. (3) For Configu-
ration B; a slant range of
9,884 feet, with stripes
150 ft long and 5.75 ft
wide, spaced 5.75 ft
apart.
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