Page Date: 19. February 2014
911 - 5
Section 911
BECKER ATC 4401 Transponder
Pilot´s Operating Handbook US
EXTRA 330LX
3 After the switch-on test has elapsed and no error-message is written in the display, the transponder
switches to the mode set on the mode switch (A).
N O T E
The blind encoder is only powered if the transponder is not switched OFF (at least SBY).
A blind encoder needs a warm-up time (sometimes a several minutes). Therefore although
the solid state transponder needs no warm-up time, turn the transponder to SBY
immediately after starting the engine.
911.1.3
SQUAWK SELECTION
1 The transponder remains switched in the standby mode until requested by the ground station (ATC)
to transmit a code, e.g. „squawk alpha 6426“.
2 Using the double rotary switch (B,C) set the 4-digit code requested by ATC as follows :
a Using switch (B) move the cursor to the particular digit. Digits 0 to 7 can then be set using switch
(C).
N O T E S
If switch (B) is turned clockwise or counter-clockwise, the cursor is moved one position to
the right or the left. The cursor appears only in the code display and is indicated by the
flashing digit. If no cursor is visible, the first digit flashes after a clockwise rotation and
the last digit after a counter-clockwise rotation. When the code is being changed in the ON
or ALT position, the transponder temporarily switches to the standby mode.
The active time of the cursor and the rate of flashing can be changed in the configuration
mode.
b If the cursor is not moved again within of 3 seconds (can be changed in configuration mode) or
if the cursor is moved so far that it can no longer be seen in the display field or the identification
switch is pressed (in the ON or ALT mode), the code currently set is switched active.
N O T E S
Whilst settings are taking place, the transmission branch of the transponder is inhibited
to prevent unintentional transmission.
If only two digits were named by ATC, e.g. „Squawk alpha 64“, then a zero is to be used
for positions three and four, i.e. „6400“.
c The last used code is stored in each case and is also activated when the transponder is switched
on.
SPECIAL VFR CODINGS
Two user-specific VFR codes can be stored and activated on the transponder.
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