453 

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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