Page Date: 19. February 2014
911 - 7
Section 911
BECKER ATC 4401 Transponder
Pilot´s Operating Handbook US
EXTRA 330LX
Avoid selecting code 7500 and all codes in the 7600-7777 range. These trigger special indicators
in automated facilities. Only the code 7500 will be decoded as the hijack code. An aircraft’s
transponder code (if available) is utilized to enhance the tracking capabilities of the ATC facility,
therefore care should be taken when making routine code changes.
N O T E
Unintentional transmission of an emergency code is prevented in that the transponder
replies are inhibited whilst the code is being set. This applies particularly where the new
code is being set in the ON or ALT modes. Also if a special code is called up, no
transponder reply takes place during the period in which the previous code can be
reactivated (approximately 3 seconds).
911.1.4
FLIGHT OPERATION IN MODE A (TRANSPONDER REPLY CODE ONLY)
1 Select squawk as described above.
2 Set mode switch (A) from
SBY
to
ON
. The transponder immediality replies with the set code. A
triangle on the left next to the code signals the tranponder replies.
911.1.5
FLIGHT OPERATION IN MODE A+C (REPLY CODE AND ALTITUDE CODE)
1 Select squawk as described above.
2 ATC requests the transmission „alpha/charlie“ or „charlie“, switch the transponder to
ALT
using
mode switch (A).
3 The transponder replies using the code set and in response to mode C requests it tansmits the
flight level of the aircraft to ATC. A triangle on the left next to the code signals the transponder
replies.
911.1.6
SQUAWK IDENT
After a „squawk ident“ request from ATC, press Ident button
IDT
(D) briefly. This transmits an
additional special pulse (SPI) for approx. 18 seconds, which enables the aircraft to be clearly
identified on the radar screen of the controller.
'Idt'
appears in the bottom line of the LC display
during this time.
911.1.7
TEST
The following different tests are integrated in the transponder or can be triggered at the transponder:
1 Automatic switching-on test, in which the display (E) is flashing with all digits for 3 seconds. The
unit is subject to a self-test in this time.
Содержание 330lx
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