User's Manual

Chapter 1 – System Description
SKY899 Pilot’s Guide
1-2
Preliminary
When installed as a TAS, the SKY899 can share a BFG model
WX-1000/SKY497 monochrome display (P/N 78-8060-5900-8 or -
9
) with a BFG STORMSCOPE
®
model WX-1000 using a remote
SKYWATCH/Stormscope mode switch. As a TAS, the SKY899 can
also display traffic on a growing number of
Multi-Function
Displays (MFDs) and Electronic Flight Instrument System
(
EFIS) displays from companies such as Avidyne, Garmin, and
Collins, or on select Instantaneous Vertical Speed Indicators
(
IVSIs) from Honeywell or Sextant, or on a compatible weather
radar indicator via the
BFG Radar Graphics Computer, model
RGC250. Check with your dealer or with BFG for a current list
of approved alternate displays.
When installed as a
TCAS I, the SKY899 displays its traffic
information on a
TCAS I-compatible alternate display as de-
scribed above, but not on the
WX-1000/SKY497 display.
Hereafter the word display refers to the
WX-1000/SKY497
display unless otherwise indicated. For any other display, refer
to that display’s manual for a description of how it displays
SKY899 traffic information.
Transmitter Receiver Computer (TRC)
The TRC is the primary unit of the SKY899. It converts signals
from the directional antenna and from other aircraft systems
into an on-screen picture of intruder aircraft locations, and if
necessary, aural traffic advisories. The
TRC can track up to 35
intruder aircraft simultaneously, but to reduce clutter, the
SKY899 only displays the 8 most threatening intruders being
tracked. The
TRC also has built-in test equipment to detect
faults and to verify proper operation.
Directional Antenna
The directional antenna transmits omnidirectional mode C
interrogations and receives directional replies from other
transponder-equipped aircraft in the vicinity. The antenna also
receives
Automatic Dependent Surveillance-Broadcast (ADS-B)
mode
S extended squitter broadcasts from intruder aircraft.
TRC & Antenna