TCAS791
Operating Instructions
Pilot’s Guide
2-11
c. If the altitude displayed at the bottom of the test screen on the
CD605 is not within ±250 ft of the altitude indicated on the baro-
metric altimeter, turn off the TCAS791 and schedule it for correc-
tive maintenance as soon as possible.
d. If you hear the “TCAS Test Failed” message or see a TCAS Failed
screen or a TCAS FAIL message, turn off the TCAS791 and sched-
ule it for corrective maintenance as soon as possible.
e. If you hear the “TCAS Test Passed” message without seeing the
test screen on the CD605, turn off the TCAS791 and schedule the
CD605 for corrective maintenance as soon as possible.
f. If you hear the “TCAS Test Passed” message but a maintenance
code appears at the bottom of the standby screen on the CD605
(figure 2-8), continue to use the TCAS791, but schedule it for
corrective maintenance as soon as possible.
Refer to the section on maintenance codes later in this chapter for
more information.
g. When you’re done with the self test, reset the barometric altim-
eter to the current barometric setting.
Switch Out of Standby
You must manually switch out of standby using the following proce-
dure if you want the TCAS791 to display traffic information while you’re
still on the ground. If you do not manually switch out of standby, the
TCAS791 will automatically switch out of standby 8 to 10 seconds
after takeoff and into the above display mode and 10 nmi range on the
CD605 (display mode and range may vary on alternate displays). The
ability to switch out of standby on the ground in conjunction with the
above display mode is especially helpful when you’re getting ready to
take off from an airstrip that doesn’t have an ATC tower to tell you what
traffic is above and around you.
Figure 2-7. TCAS Failed Screen
