The FAA
requires pilots to enter the currently assigned squawk code
into the ADS-B transmitter as well as the standard Mode A/C
transponder. The Xtreme Vision software provides this
functionality through the Control Panel interface. Control
Functions include:
-
Squawk Code
-
Transmitter State (ON/STBY)
-
ICAO
address (required for each aircraft)
-
Anonymity Feature (no ICAO or Squawk sent)
-
Emergency Codes.
Excerpt
from the
FAA Final Rule is shown below:
|
30174 Federal Register / Vol. 75,
No. 103 / Friday, May 28, 2010 / Rules and
Regulations
8. Indication of the Mode 3/A
Transponder Code Specified by ATC (Requires
Flightcrew Entry)
The FAA has determined
that the same ATC-assigned Mode 3/A code must be
transmitted by both the transponder and the ADS–B
Out message. If the code transmitted
by ADS–B differs from the Mode 3/A code transmitted
by the transponder, it could result in duplicative
codes or inaccurate reporting of aircraft position.
If the aircraft’s avionics are not capable of
allowing a single point of entry for the transponder
and ADS–B Out Mode 3/A code, the pilot must ensure
that conflicting codes are not transmitted to ATC.
ATC uses the Mode 3/A code to identify aircraft that
are under surveillance and possibly under ATC
direction. This identifier is necessary to issue
directions to specific aircraft about nearby air
traffic. The Mode 3/A code and the International
Civil Aviation Organization (ICAO) 24-bit address
are duplicative for some functions. This duplication
is necessary because many current ATC automation
systems are not yet capable of using the ICAO 24-bit
address. Therefore, the FAA retains this message
element in the rule. |
The FAA
Final Rule can be found
here.
In
addition, the Aeronautical Information Manual (AIM) defines
the requirement in 4-5-7c.2, excerpted below:
|
c. ADS-B
Capabilities
2. ADS-B
avionics typically allow pilots to enter the
aircraft's call sign and Air Traffic Control
(ATC)-assigned transponder code, which will be
transmitted to other aircraft and ground receivers.
Pilots are cautioned to use care when selecting and
entering the aircraft's identification and
transponder code. Some ADS-B avionics panels are not
interconnected to the transponder. Therefore, it is
extremely important to ensure that the
transponder code is identical in the ADS-B and
transponder panel. Additionally, UAT systems
provide a VFR "privacy" mode switch position that
may be used by pilots when not wanting to receive
air traffic services. This feature will broadcast a
"VFR" ID to other aircraft and ground receivers,
similar to the "1200" transponder code. |
The FAA
AIM reference can be found
here.
