User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
when the aircraft is flying less than 1000 feet (304.8 meters) above
ground level (AGL).
The TA mode is annunciated TA ONLY at the upper left corner of the
display.
3 Test Mode
Pushing the TEST button on the control panel starts a self-test program
which verifies proper operation of the TA and RA displays and of the
aural advisories on the audio system.
The test mode does not affect normal TCAS operation, provided the
selected transponder remains in normal operation during the test cycle.
Should a TA or RA occur during the test sequence, the test aborts, and
the advisory is announced and displayed.
The test mode just described excludes extended self-tests performed on
the ground, where TCAS is inoperative.
(b) Hybrid Surveillance
(Applicable only to Part No.9005000-11801 and -55801)
The purpose of hybrid surveillance is to decrease TCAS interrogations
and associated Mode S replies and use passive surveillance to track
intruders that are far from being a threat without degradation of the
TCAS collision protection. Another goal is to maintain tracks that may
have been dropped from the display in high density traffic environments
due to interference limiting.
Hybrid Surveillance includes both active and passive surveillance.
Active surveillance uses the standard TCAS/transponder
interrogations/replies to provide range, bearing and altitude. Passive
surveillance is used to track traffic that is far from being a threat.
Passive surveillance data including latitude, longitude and ground speed,
must be provided by a navigation source that is typically GPS based and
the data is broadcast and received through the processing of Mode S
extended squitter. Under hybrid surveillance, TCAS active interrogations
are used to validate the passive surveillance position.
An extension of passive surveillance is extended hybrid surveillance
which is applied when ownship and intruder ADS-B position data meet
certain quality and power requirements and the intruder is not a near
threat in range and altitude. Under extended hybrid surveillance, the
intruder is tracked with ADS-B data exclusively.
Refer to Section 6, sub-section Hybrid Surveillance Test/Fault Isolation
Procedure for recommended procedures for performing hybrid
surveillance checks, the recommended scheduled maintenance interval
and for instructions for a required periodic reliability report.
Pub. No. 8600200-001, Revision 004
34-45-29
1-78
04 Nov 2014
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