Sandel SN3308 - Flags and Abnormal Conditions

Flags and Abnormal Conditions
The SN3308 detects abnormal conditions such as flagged navigation
receivers and failed directional gyro or fluxgate. It also monitors its
own internal temperature and provides warnings for over-
temperature or loss of cooling conditions.
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7
Abnormal Conditions
CHAPTER
Condition Display
NAV flag HSI display: large red “X” through the CDI
scale, and the deviation bar is not
displayed. Numeric bearing display
shows “- - -”.
RMI display: bearing pointers are not shown.
Numeric bearing displays show
“- - -”.
Note: CDI pointer will be visible under “x” for
two minutes after power-up to allow testing
for certain GPS receivers.
GS (glideslope) flag Large red “X” through glideslope scale,
glideslope pointer is not displayed.
Directional gyro failure Compass rose color changes from white to amber.
Heading data is obtained from fluxgate alone.
Because fluxgate signals are averaged over time,
heading response will lag the aircraft significantly.
Fluxgate failure Compass rose color changes from white to
amber, and the heading numbers are removed
from the compass rose. The display can be
used to determine relative headings for turns,
but the magnetic compass should be used to
determine absolute heading.
Loss of gyro & fluxgate Loss of compass rose.