User Guide Part 2

Pilot’s Guide 3-1
SKY497 Principles of Operation
Chapter 3
Principles of Operation
Introduction
This chapter describes Traffic Advisory ( TA ) criteria and other factors that affect the display
of traffic symbols. Table 3-1 summarizes the criteria necessary for the SKY497 to display a
TA . Figures 3-1 through 3-3 show the TA zones for various aircraft configurations.
SKY497 Pilot’s Guide
*Having a radio altimeter means having a compatible Arinc 429 radio altimeter wired to the SKY497 and
providing valid altitude information.
**CPA means Closest Point of Approach.
Sensitivity Level A Sensitivity Level B
TheSKY497Will IssueaTrafficAdvisory…
No.
If Your
Aircraft…
AndYour
Aircraft’s
Altitude Is…
AndYour
Landing
GearIs…
AndAnIntruder
Aircraft IsDetected…
1has a radio
altimeter*
below 2000ft
AGL
withina 0.2nmihorizontal
radiusanda ±600ft relative
altitude
2 within15–20sec.of
CPA**
3 above 2000ft
AGL
withina 0.55nmi
horizontalradiusanda
±800ft relative altitude
4 within20–30sec.of
CPA**
5does not
have a radio
altimeter*
down withina 0.2nmihorizontal
radiusanda ±600ft relative
altitude
6 within15–20sec.of
CPA**
7 up withina 0.55nmi
horizontalradiusanda
±800ft relative altitude
8 within20–30sec.of
CPA**
9 fixed withina 0.55nmi
horizontalradiusanda
±800ft relative altitude
10 within20–30sec.of
CPA**
Table 3-1. Ten Situations in Which a Traffic Advisory Will Occur
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 TAs
during takeoff and landing (sensitivity level A), and to maximize the detection of TAs
during the cruise phase of your flight (sensitivity level B).