User manual

80 81
80 81
Operating the KT 76C
Before starting your aircraft’s engine, make sure that the KT 76C
function selector knob, or your avionics master, is turned to OFF. After
engine start, turn the function selector knob to SBY (standby). Give
your transponder about 45 seconds to become operational. Select
the proper reply code by pressing the desired code entry buttons. The
reply code will be displayed in the code window. Before takeoff, rotate
the function selector knob to the ALT (altitude) position for Mode C
altitude reporting to ATC. If you do not have an encoding altimeter,
rotate the function switch to ON for Mode A reporting.
Altitude Display
The KT 76C displays Flight Level Altitude, marked by the letters „FL”
and a number in hundreds of feet, on the left side of the display. For
example, the reading „FL 065” corresponds to the altitude of 6,500
feet, referenced to 29.92 inches of mercury (or 1013 hP) at sea level.
Flight Level Altitude represents „pressure altitude,” and should not
be confused with true altitude. Please note that the displayed altitude
may not agree exactly with the aircraft’s altimeter when flying below
18,000 feet, because encoders are preset to 29.92 inches of mercury.
An encoder’s altitude transmission is automatically corrected for proper
altimeter setting by a ground based computer, to present the correct
altitude to the controller.
Ranging from -1,000 to +99,000 feet, Flight Level Altitude is displayed
only when altitude reporting is enabled. If the altitude window is blank
or shows a series of dashes (as in the case of an invalid altimeter code
being reported), altitude reporting will be disabled.
CLR Button
Code entry mistakes are corrected, one digit at a time, by pressing the
CLR button and reentering the correct code. The last active code will
be displayed if a complete four-digit code has not been entered and
there is no activity on any of the code entry buttons, the VFR button,
or the CLR button for four seconds.