239
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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