BendixKing KXP 756 - Manual (Page 48)

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display to respond with maximum
brilliance if needed or to follow the
panel lighting dimmer bus.
The test position of the
Function Selector knob provides for a
preflight or airborne check of
transponder operation. This check will
be independent of any ground
interrogation. Switching the Function
Selector knob to the Test position
should cause all segments of the
display to light for 2 seconds then the
squawk code display will display flight
level(altitude) information for 4
seconds, then return to
Standby(“SBY”) mode. The flight level
readout is displayed in 100 foot
increments, thus a readout of 005
indicates 500 feet, or a readout of 042
indicates a flight level of 4200 feet. If
an encoder is not included in the
installation, dashes will be displayed
in the squawk code display. The
transmitter is inhibited during the test
function.
In a dual system the external
standby function may be used. If the
system is configured in this manner,
the active transponder will function as
normal. The inactive(external
standby) transponder will not transmit
regardless of the position of the
function switch. In any functioning
mode except test, display will show
the reply code of the standby unit.
The letters SBY will indicate that the
unit is in standby mode. The unit that
is in external standby will show the
flight level when the function switch is
placed in the test position and the
letters FL will illuminate. While in
External Standby the KFS 578A
provides only two modes with the
function switch, counter-clockwise for
flight level information and clockwise
for the standby aircraft identification
code.
Note: The flight level readout is not
corrected for atmospheric pressure
changes.
The KFS 578A may be
included in a Traffic Alert and Collision
Avoidance System(TCAS I or II). In
this case the KFS 578A will also
control the TCAS functions.
When the Traffic
Advisory(“TA”) Mode is selected “TA”
will be annunciated on the control unit
display. This mode will place the
TCAS in the Traffic Advisory only(no
Resolution Advisory) mode. The
selected Mode S transponder will
remain in the “ALT” mode while the
control unit annunciates “TA”.
Note: The KFS 578A does not
display TCAS information.
Rotating the Function Switch
clockwise from “TA” mode will cause
“TA/RA” to be annunciated on the
control unit’s display. The TCAS II will
be switched to the “TA/RA” mode.
The selected Mode S transponder will
remain in the “ALT” mode while the
control unit annunciates “TA/RA”.
Note: On non TCAS versions, “TA”
and “TA/RA” are only annunciated in
the “TST” mode when all segments of
the display are annunciated.
The TCAS Flight Level is not
related to the transponder function of
the same name. The TCAS Flight
Level function causes the TCAS
indicator to change displayed altitude
from Relative Altitude (intruder to own
aircraft) to absolute altitude. The
TCAS Flight Level is initiated by
pressing and holding (greater than 3
seconds) the FL/Cursor Switch. The
TCAS Flight Level function will time
out from absolute altitude to relative
altitude after 15 seconds. The TCAS
Flight Level function is defined by the
TCAS unit. (no TCAS Flight Level is
displayed on the KFS 578A)
The TCAS Range Switch is
used to control the range (in nautical
miles) that traffic is displayed on the
TCAS indicator. The TCAS Range
Switch is not a hard switch but a
continuous rotary switch. Turning the