User Guide Part 2

3-4 Pilot’s Guide
Principles of Operation SKY497
0.55 nmi
+800 ft
–800 ft
T
h
i
s
a
r
e
a
or 30
s
e
c
o
n
d
s
*
*20 seconds for non-altitude reporting intruder aircraft
Not to Scale
Intruder Aircraft
GL
TA Zone
(Sensitivity Level B)
Figure 3-3. TA Zones If Your Aircraft Has Fixed Landing Gear and No Radio Altimeter
Audio Inhibit,
GPWS
If your aircraft has a Ground Proximity Warning System ( GPWS ) interfaced with the
SKY497 and a GPWS alarm occurs, the SKY497 will sense the alarm and delay the aural
“traffic, traffic” component of any TAs issued during the GPWS alarm until the alarm clears.
TA Symbol Duration
The TA symbol remains on screen for a minimum of 8 seconds even if the intruder aircraft
no longer meets the TA criteria as long as the SKY497 continues to track the aircraft.
Ground Target Filtering
Ground target filtering reduces the clutter of visual symbols and aural announcements that
would otherwise be generated for intruder aircraft that are typically present on or near the
ground near airports.
Ground target filtering prevents the issuing of TAs and other traffic symbols for intruder
aircraft determined to be below 380 ft AGL .
The SKY497 uses ground target filtering only if your aircraft has a radio altimeter and you’re
below 1,700 ft AGL .