Avidyne IFD540, Руководство пилота

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5-4 Navigation
NOTE
Manual Sequencing May Be Required
In Electro-mechanical installations where the IFD
does not have an altitude input, a CAS message
(“Manual Sequence Req’d”) prompting the pilot to
manually sequence legs of the flight plan will be
presented on Heading-to-Altitude leg types (e.g.
some missed approach legs). Since the IFD does
not know altitude in this case, it does not know
when to sequence to the next leg. Failure to
manually sequence to the next leg will result in the
IFD maintaining the leg heading indefinitely.
NAV SOURCE KNOB
The top right IFD knob is the dedicated IFD Navigation (Nav)
Source knob. Think of the nav source knob as a channel selector
to choose which Nav source the pilot wants depicted on the
moving map. The chosen source will also be sent to other on-
board systems like an EFIS (e.g. Aspen PFD) and in-turn, the
autopilot, as well as driving any conventional CDI or RMI or HSI
indicator. VLOC and GPS course and deviation data may all be
coming into the IFD continuously but the channel selector acts as
a filter to determine which one gets used in the nav solution and
displayed on the IFD. The nav source knob must typically be
twisted to select the desired state. The selected nav mode
indication will flash for several seconds before taking effect;
thereby giving you time to visually confirm the desired state.
Nav Source Knob State Indication
As described earlier in this section, multiple levels of aircraft
system integration are possible, and will affect the possible states
of the Nav Source knob. The table below describes all possible
nav source states: