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System Overview
1-27
The keyboard will be dismissed through one of several methods
to include,
•
Touching one of the Mode soft keys or the IDENT soft key;
•
Touching the red-X in the top right corner of the keyboard;
•
Letting it time-out on its own.
Presuming the transponder has been setup to accept the input
from the IFD, it will automatically toggle between air and ground
modes during takeoff and landing rolls.
IDENT can be performed via several means. If the IFD has been
configured for a transponder data block along the left side, then
there is a dedicated line select key button for the IDENT function.
Another method is via the transponder keyboard by pressing the
IDENT soft key. A third method is by pressing the IDENT soft key
that is displayed in the top left corner of the IFD when the bottom
left IFD Com/Nav/Xpndr knob is pressed.
Some aircraft may even been equipped with an optional external
IDENT switch (e.g. on yoke).
Transponder Mode Descriptions and Entry
Mode S transponders have the following modes, each
represented by its own mode key on the transponder keyboard:
ALT
The transponder will respond to all interrogations.
ON
The transponder will respond to all interrogations, but
altitude reporting is suppressed.
GND
The transponder will respond to Mode S ground
interrogations from surface movement radar. This mode
is only available in installations that send a ground/air
discrete signal to transponder.
SBY
The transponder is on, but will not reply to any
interrogations.
When airborne, the transponder should always be set to ALT
unless otherwise directed by Air Traffic Control.
Aircraft installations that include a ground/air state input (such as
a gear squat switch or discrete input from an IFD540) will
automatically select GND on landing or while taxiing and will
automatically select ALT when airborne. In these installations, the
Содержание IFD540
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