359 

Federal Aviation Administration, DOT 

Pt. 60, App. C 

4.e. .............

Surface resolution. 

Not greater than two (2) arc 

minutes. 

N/A .........................................

An SOC is required and must 

include the appropriate cal-
culations and an expla-
nation of those calcula-
tions. Level B requires sur-
face resolution not greater 
than three (3) arc minutes. 

X 

X  When the eye is positioned 

on a 3

° 

glide slope at the 

slant range distances indi-
cated with white runway 
markings on a black run-
way surface, the eye will 
subtend two (2) arc min-
utes: (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 Configuration B, a slant 
range of 9,884 feet, with 
stripes 150 ft long and 5.75 
ft wide, spaced 5.75 ft 
apart. 

4.f. ..............

Light point size ......................

Not greater than five (5) arc 

minutes. 

N/A .........................................

An SOC is required and must 

include the relevant cal-
culations and an expla-
nation of those calcula-
tions. 

X 

X  Light point size may be 

measured using a test pat-
tern consisting of a cen-
trally located single row of 
light points reduced in 
length until modulation is 
just discernible in each vis-
ual channel. A row of 48 
lights will form a 4

° 

angle 

or less. 

4.g. .............

Light point contrast ratio. 

A 1

° 

spot photometer may be 

used to measure a square 
of at least 1

° 

filled with light 

points (where light point 
modulation is just discern-
ible) and compare the re-
sults to the measured adja-
cent background. During 
contrast ratio testing, simu-
lator aft-cab and flight deck 
ambient light levels should 
be zero. 

4.g.1. ..........

Not less than 10:1 .................

N/A .........................................

An SOC is required and must 

include the relevant cal-
culations. 

X 

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