Garmin GTS 855 - Manual (Page 18)

14 Garmin GTS 8XX Series Traffic Advisory System 190-00587-02 Rev. A
System Test
NOTE: GTS 8XX Series traffic surveillance is not available during the system
test. Use caution when performing a system test during flight.
The GTS 8XX Series provides a system test mode to verify the TAS system is
operating normally. The test takes ten seconds to complete. When the system test
is initiated, a test pattern of traffic symbols is displayed on the Traffic Page. If the
system test passes, the aural announcement “TAS System Test Passed” is heard,
otherwise the system announces “TAS System Test Failed.” For the GTS 850,
the aural announcement is “TCAS System Test Passed/Failed.” When the system
test is complete, the GTS 8XX Series enters Standby Mode. The system may be
installed so that the system test is unavailable during flight.
Figure 7 Self-Test Mode