System Functions; Compass System Interface; Nav Source Selection - Sandel SN3308 Installation Manual

11.1.6 System Functions

11.1.7 Compass System Interface

Power up the system and verify that within 1 minute the compass card is displayed in white
and agrees with the heading on a magnetic compass.
Completed _______ Comment __________________________________
Disable the fluxgate excitation to the SN3308. Verify that within 10 seconds the compass
digital heading is flagged . Restore the fluxgate excitation and verify that within 10 seconds
the display is fully restored. Note: If fluxgate excitation and gyro are interconnected, remove
both signals simultaneously and look for simultaneous failure indications.)
Completed _______ Comment __________________________________
Remove power to (or otherwise disable) the remote directional gyro. Verify that the compass
card is displayed in amber AND that a warning message is displayed on the SN3308 which
requires operator acknowledgement.
Completed _______ Comment __________________________________

11.1.8 NAV Source Selection

If the SN3308 is configured in "master" mode (no external NAV/GPS switch):
Press the [NAV] button repeatedly and verify that the screen legend next to the button
cycles correctly through the configured nav sources, i.e. NAV1, NAV2, GPS1, GPS2
(or as configured). For each nav source, create valid and invalid nav conditions and
verify correct display of the SN3308 nav flag for each receiver (the large red "X"
through the CDI). For each VOR/LOC source, verify that tuning an ILS frequency
causes the glideslope (vertical deviation) scale to display on the screen, even if it is
flagged.
Completed _______ Comment __________________________________
Press the [NAV] button and select a source other than NAV1, such as GPS or NAV2
(if configured). Tune NAV1 to an ILS frequency, and verify that after a one-second
delay, the selected nav source automatically reverts to NAV1. Verify that as long as
90106-IM-G(4) Installation Manual W SIG.doc
Sandel Avionics
SN3308 Navigation Display
Installation Manual
Appendix-E Page 5