Installation manual

4-8 Approach Procedures
Glide slope will automatically arm if the following 4 conditions are
met:
1. PFD Primary Nav LSK is set to VLOC1 or VLOC2;
2. The selected GPS Nav-Com (VLOC1 or VLOC2) has a
valid localizer/glide slope frequency loaded in the active;
3. NAV mode on the DFC90 must be armed (cyan) or
engaged (green). (APPR mode will also be automatically
armed or engaged under these conditions);
4. The course value on the PFD is set to any value that
would create a “front course” condition.
Note that there can only be one armed vertical mode at a time.
So, if VS was engaged (green) and ALT was armed (cyan), GS
wont arm until ALT transitions to engaged (green), provided the
four conditions listed above are met.
Glide slope will automatically transition to engaged/captured
when two additional conditions are met:
5. Glide slope signal is received by the selected VLOC and
is considered valid;
6. Glide slope signal is within approximately 1 dot of center
beam. Note that this can be from below or above – both
are equally valid with the DFC90.
Glide slope is intended to be captured from below. If so desired,
or required via NOTAM, GS mode can be toggled on/off through
presses of the “GS” button on the autopilot control panel. There
is no other required time to press the “GS” button.
In the event the pilot is attempting to capture the glide slope from
above, glide slope will be captured as the aircraft passes through
the glide slope signal, if GS mode was previously armed. If GS
hadn’t been armed, glide slope will be captured by manually
pressing the “GS” button on the autopilot control panel when
within 1 dot of glide slope centerline.
Change 3