I. VFR code activation
(1) Press the VFR push-button (J). The preselected code is then displayed.
After 3 seconds, the displayed code gets active and overwrites the pre-
viously-set reply code.
(2) Pressing push-button (J) again within 3 seconds reactivates the previ-
ously-set reply code.
NOTE :
When the unit is delivered, the VFR button is not assigned a code. This
means that if this button is pressed for 0.5 seconds, “----” is shown in the
code display and the transponder then switches back to the previously-active
code.
J. Internal and external Ident
The special identifier pulse (SPI) can be triggered by pressing “IDT” button on
the control panel or from external input located on the transponder.
If special identifier pulse has been triggered, then “IDT is displayed on the
display as long as SPI is active.
K. Special codings for air emergencies
(1) Special codings, which depend on the type of incident, are stipulated for
certain air emergencies:
n 7500 Hijacking
n
7600 Loss of communications
n
7700 Emergency on board which constitutes an immediate
danger to the aircraft
(2) The code evaluation devices of the radar systems automatically alarm
the controllers at the radar screens immediately if one of these special
codes is received.
INSTALLATION AND OPERATION BXP6401-X-(XX)
Page 3-9
34-50-08 September 2011
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