Chapter 1 – System Description
SKY497 Pilot’s Guide
1-6
Functional Description
Functional Description
The
SKY497
is an active system that operates as an aircraft-to-
aircraft interrogation device. The
SKY497
interrogates aircraft
transponders in the surrounding airspace (within an
11
nmi
horizontal radius) similar to the way that ground-based radar
interrogates aircraft transponders. When the
SKY497
receives
replies to its interrogations, it computes the responding
aircraft’s range, relative bearing, relative altitude, and closure
rate. The
SKY497
then predicts collision threats and plots the
eight most threatening aircraft locations on the display.
Figure
1-6
shows the
SKY497
vertical display modes (look up,
look down, and normal). The figure also shows the traffic zones
around your aircraft and the traffic symbols that appear on the
display when intruding aircraft enter one of those zones.
A solid circle is the visual part of the
T
raffic
A
dvisory (
TA
) that
the
SKY497
generates when it predicts that an intruder aircraft
may pose a collision threat. The aural part of the
TA
, “traffic,
traffic,” is annunciated over a cockpit speaker or headset. A
solid diamond (
P
roximity
A
dvisory,
PA
) represents traffic that is
close but does not pose an immediate collision threat. (
PA
’s
only appear on alternate displays, not including the
RGC
/radar
indicator.) An open diamond represents
O
ther
T
raffic (
OT
)
that does not pose an immediate collision threat.
The
SKY497
uses either
S
ensitivity
L
evel
A
(
SLA
) or
S
ensitivity
L
evel
B
(
SLB
) to determine when to display a
TA
. In general,
SLB
is used during the in-flight phase and
SLA
is used during
takeoff and landing. Sensitivity levels and other factors affecting
the display of traffic symbols are discussed in detail in chapter
4
.
Summary of Contents for SKY497
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