Narco Avionics AT165 TSO Operation Manual - page 5
BUTTONS FOR ALTERNATE FEATURES
IDENT
Pressing the
IDENT
button will activate the SPIP (Special Position Identification Pulse) signal for
approximately 20 seconds. This signal will "paint" an instantly identifiable image on the controller’s scope.
This signal must only be used upon request of a "Squawk IDENT" from the controller. Use at any other time
could interfere with another aircraft sending a SPIP. The IDENT legend will appear in the Code window while
the Ident signal is being sent.
VFR
Pressing the
VFR
button will cause the squawk code to either change from the user entered code to a VFR code
or change back to the user entered code from the currently displayed VFR code. The last used squawk code is
automatically recalled when the unit is cycled off and on.
HOLD
Pressing the
HOLD
button will enter the
Altitude Hold
mode and lock the current altitude as the HOLD
altitude. The Altitude display area will now show the altitude difference relative to the HOLD altitude in 100ft
increments. The altitude display area will flash if the
Altitude Buffer
value is exceeded. Additionally if the audio
alert function is available and has been installed, a warning will be heard. The audio warning will be present
only while the unit is in the
Altitude Hold
mode. This is a warning only and is not tied to any navigation
systems.
Depressing the
HOLD
button for two seconds or longer will allow the setting of the
Altitude Buffer
. The
available range is 200ft to 2500ft. Once set, momentarily pressing
HOLD
again will save this buffer value. The
buffer value will be retained when the unit is powered off. This mode must be exited before other functions can
be accessed. Once started this mode will be exited when it has been inactive for 10 seconds.
FUNC
Pressing the
FUNC
button cycles the timer display between
Flight Timer
,
Count Up Timer
, and
Count Down
Timer
.
Holding the
FUNC
button in for 5 seconds or longer will Flip/Flop the left and right display areas. This
function is extremely useful in the unlikely event of an unreadable LCD display. When the unit is turned off it
will always restart with the displays in their default locations.
START/STOP
Pressing the
START/STOP
button will independently start or stop the
Count Up
and
Count Down
timers
depending on which is currently displayed.
CRSR/CLR
When in
Flight Timer
, depressing the
CRSR/CLR
button for two seconds will reset the
Flight Timer
.
When in
Count Up Timer
, depressing the
CRSR/CLR
button for two seconds will reset the
Count Up Timer
.
When in
Count Down Timer
, with the timer stopped, momentarily pressing the
CRSR/CLR
button once will
recall the preset count down time. Momentarily pressing this button again will activate the cursor in the timer
window. At this point, changes to the
Count Down Timer
value can be made by using the Code Selector/Data
Entry knob.
PRINTED IN U.S.A. REV C JANUARY 2005