User's Manual

Chapter 4 – Principles of Operation
SKY899 Pilot’s Guide
4-2
Preliminary
TA Criteria
Table 4-1. Fourteen Situations in Which a Traffic Advisory Will Occur
* Having a radio altimeter means having a compatible radio altimeter wired to the SKY899 and
providing valid altitude information.
** CPA means Closest Point of Approach.
*** Ground speed is not available whenever your GPS navigation information is not available.
Sensitivity Level A Sensitivity Level B
The SKY899 Will Issue a Traffic Advisory…
No.
If Your
Aircraft…
And Your
Aircraft’s
Altitude Is…
And Your
Landing
Gear Is…
And Your
Ground Speed
Is…
And An Intruder
Aircraft Is
Detected…
1 has a radio
altimeter*
below 2000 ft
AGL
within a 0.2 nmi
horizontal radius and a
±600 ft relative altitude
2 within 15–20 sec.
of
CPA**
3 above 2000 ft
AGL
within a 0.55 nmi
horizontal radius and a
±800 ft relative altitude
4 within 20–30 sec.
of
CPA**
5 does not
have a radio
altimeter*
down within a 0.2 nmi
horizontal radius and a
±600 ft relative altitude
6 within 15–20 sec.
of
CPA**
7 up within a 0.55 nmi
horizontal radius and a
±800 ft relative altitude
8 within 20–30 sec.
of
CPA**
9 fixed not available*** within a 0.55 nmi
horizontal radius and a
±800 ft relative altitude
10 within 20–30 sec.
of
CPA**
11 available and
greater than or
equal to 120 knots
within a 0.55 nmi
horizontal radius and a
±800 ft relative altitude
12 within 20–30 sec.
of
CPA**
13 available and less
than 120 knots
within a 0.2 nmi
horizontal radius and a
±600 ft relative altitude
14 within 15–20 sec.
of
CPA**