¶ Introduction
In his area of control, an active controller is responsible to assign a
transponder code to all aircraft. It is the responsibility of the pilot
in command to tune this transponder code in his aircraft.
To reduce pilot and controller workload and the need for
controller/pilot communication, the number of code changes required of
the pilot should be kept to the minimum.
¶ Transponder code
As the system of discrete transponder codes is very complex in real
aviation, there are no IVAO global rules to assign specific series of
transponder codes to a specific activity or type of flight.
Outside of specific cases given in this documentation, the transponder
code assignment is free.
As ATC, be aware that you cannot assign a particular code to an aircraft
outside your airspace.
Some countries have their own transponder code allocation. Contact the
ATC Operations Coordinator of the related division or ATC Operations
Director.
Except for aircraft in a state of emergency, or during radio
communication failure, the transferring unit shall assign transponder
code A2000 to a controlled flight prior to transfer of communications
except before a transfer to an accepting ATC unit.
Aircraft squawking 2000 in
non controlled area
¶ Specific Transponder display
squawking
7700 transponder code in state of emergency
squawking 7600
transponder code in state of loss of communication
squawking 7500
transponder code. (forbidden to use)
This image was created with special authorization from a supervisor in
order to make this documentation.
¶ Transponder status with IvAc
It is the responsibility of the active controller to check that a pilot
correctly uses the STDBY/TX position of his transponder. He shall
instruct the transponder change only if the pilot forgets to select the
correct position.
All pilots must:
- Set transponder to STDBY position before connecting to the IVAO
network - Set transponder to STDBY position on apron and during taxiing
- Set transponder to TX position when cleared entering on runway for
departure, and at the latest before take-off - Keep transponder to TX position while flying
- Set transponder to STDBY position after vacating the landing runway
aircraft taxiing in
STBY mode
Aircraft call sign may be displayed, depending on the IvAc settings
aircraft in TX or
alticoder mode
There are only two representations of the transponder mode when the
aircraft is in TX or alticoder mode:
- Mode A transponder with no pressure altitude information
<File:Ivac> aircraft mode
a.PNG
This representation is also valid for N, X and I modes. The aircraft
identification is always active in IvAp.
- Mode C or Mode S transponder with pressure altitude information
<File:Ivac> aircraft mode
s.PNG
This representation is also valid for P mode. The aircraft
identification is always active in IvAp.
¶ Aircraft Identification with transponder
As an air traffic controller in a large zone, you may not easily locate
an aircraft quickly.
In order to speed up identifying an aircraft location, the air traffic
controller can use the IDENT procedure by giving a "transponder IDENT"
or "squawk IDENT" command to the pilot.
When receiving a transponder IDENT request, a pilot will press the IDENT
button on his instrument. When the radar equipment receives the IDENT,
it results in the aircraft's blip blinking on the radar scope.
Note that IDENT should be performed on request of ATC only.
<File:Ivac> aircraft
ident.PNG the 2 aircraft
states during the blinking IDENT
IDENT can also be used in case of a reported or suspected radio failure
to determine if the failure is only one way and whether the pilot can
still transmit or receive, but not both, e.g., "Air France 8542, if you
read, squawk IDENT".
¶
See also
¶
Reference
- none
¶
Author
- VID 150259 - Creation
- VID 150259 - Wiki integration