Operating Instructions
TCAS791
2-10
Pilot’s Guide
b. With the TCAS791 in standby, press the test button in one of the
following two ways:
1) Press and release the test button.
Pressing and releasing the test button allows the display to
automatically revert to the standby screen after briefly display-
ing the test screen and any status screens.
2) Press and hold the test button.
Pressing and holding the test button holds the resulting test
screen on the CD605 or the final status screen on an alternate
display until you release the test button. (This holding feature
does not work if the test fails.)
The TCAS791 will begin its self test and the CD605 will display
a test screen similar to that shown in figure 2-6. An alternate dis-
play may display a different test screen.
Upon successful completion of the self test, you should hear the
“TCAS Test Passed” message and the CD605 should revert to the
standby screen. An alternate display may display one or more sta-
tus screens before reverting to its standby screen (TCAS OFF).
Upon unsuccessful completion of the self test, you should hear
the “TCAS Test Failed” message and the CD605 should display
the TCAS Failed screen as shown in figure 2-7. The TCAS791
will revert to standby (so that you can press the test button again
and run the test again) but the TCAS Failed screen will remain on
the display. An alternate display may display a TCAS FAIL mes-
sage instead of a TCAS Failed screen, or it may revert to its standby
screen (TCAS OFF).
Figure 2-6. Test Screen
