Chapter 4 – Principles of Operation
SKY497 Pilot’s Guide
4-2
Sensitivity Levels
Sensitivity Levels
The
SKY497
uses one of two sensitivity levels,
A
or
B
, to determine
when to display a
TA
. Having two sensitivity levels allows the
SKY497
to reduce the number of nuisance
TA
s during takeoff and
landing (sensitivity level
A
), and to maximize the detection of
TA
s
during the cruise phase of flight (sensitivity level
B
).
Sensitivity Level A
Sensitivity level
A
consists of two criteria for displaying a
TA
:
1. The intruder aircraft enters into a cylinder of airspace
surrounding your aircraft defined by a
0.2
nmi horizon-
tal radius and a height of ±
600
ft from your aircraft. (See
figures
4-1
and
4-2
.)
OR…
2. The intruder aircraft approaches your aircraft on a
course that will intercept your aircraft within
15
or
20
seconds (within
15
seconds for a non-altitude reporting
intruder aircraft; within
20
seconds for an altitude
reporting intruder aircraft).
The
SKY497
uses sensitivity level
A
in the following situations
(corresponds to numbers
1
,
2
,
5
, and
6
in table
4-1
):
1. Your aircraft has a radio altimeter and is below
2,000
ft
AGL
.
2. Your aircraft has no radio altimeter but its retractable
landing gear is down.
Sensitivity Level B
Sensitivity level
B
consists of two criteria for displaying a
TA
:
1. The intruder aircraft enters into a cylinder of airspace
surrounding your aircraft defined by a
0.55
nmi horizon-
tal radius and a height of ±
800
ft from your aircraft. (See
figures
4-1
through
4-3
.)
OR…
2. The intruder aircraft approaches your aircraft on a
course that will intercept your aircraft within
20
or
30
seconds (within
20
seconds for a non-altitude reporting
intruder aircraft; within
30
seconds for an altitude
reporting intruder aircraft).
Summary of Contents for SKY497
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