Garmin GPS 500 Pilot's Manual & Reference page 202

SECTION 12
ADDITIONAL FEATURES
Aural Alerts
A TA consists of a displayed traffic symbol (solid yellow
circle) and an aural alert. The aural alert announces
"traffic", followed by the intruder aircraft' s position,
altitude relative to own aircraft ("high", "low", or "same
altitude"), and distance from own aircraft; e.g. "traffic, 12
o'clock, high, 3 miles".
Self-Test
The GTS 8XX automatically performs a self-test upon
power up. The self-test checks internal parameters and
calibrates components of the GTS 8XX. The self-test can
also be initiated by the user during normal operation.
Check for the following test criteria on the Traffic Page
during power-up:
• If the GTS 8XX passes the power-up test; and
the aircraft both has a squat switch and is on the
ground, the Standby Screen is displayed (Figure
12-20).
• If the GTS 8XX passes the power-up test and the
aircraft both has a squat switch and is airborne,
the Traffic Page is displayed on the 6-nm display
range and in the normal altitude display mode.
• If the GTS 8XX passes the power-up test and the
aircraft does not have a squat switch, the Standby
Screen is displayed (Figure 12-20).
• If the GTS 8XX fails the power-up test (as
indicated by a FAILED screen), the GTS 8XX is
inoperable, see the GTS 8XX Installation Manual
for detailed information on Failure Response.
NOTE: The FAILED message is displayed when
the system detects an error that prohibits further
traffic display operation.
NOTE: When the system is in standby, the
GTS 8XX does not transmit, interrogate, or track
intruder aircraft.
12-14
User-initiated Test
In addition to the power-up test, the GTS 8XX performs
self-tests during normal operation. A self-test is performed
once per minute to verify that the antenna is connected.
Also, a calibration is performed at varying intervals based on
time and temperature. A user-initiated test of the GTS 8XX
interface can also be performed. The test criteria are identi-
cal to the power up self-test, although the user-initiated test
is concluded by an aural pass/fail message.
Performing a user-initiated test:
1)
2)
3)
4)
GPS 500 Pilot's Guide and Reference
Figure 12-20 Standby Mode
NOTE: A user-initiated test can only be performed
when in standby or failed mode.
Turn the small right knob to select the Traffic
Page.
From the Traffic Page, press the MENU Key to
display the Page Menu.
Turn the small right knob to select 'Self Test?'.
Press the ENT Key.
Figure 12-21 Self-Test Mode
Test-Mode
Indication
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