Transponder with IvAp[PDF]


When an aircraft carries a transponder, the pilot shall operate the transponder at all times during flight regardless of whether the aircraft is within or outside airspace where radar is used for air traffic service purposes (secondary surveillance radar SSR).

Pilots shall indicate the capability of the transponder aboard the aircraft in item 10 of the flight plan by inserting the appropriate letter.

Except in specific cases (see specific procedure), the pilot shall:
  • Operate the transponder and select transponder code as directed by the ATC unit with which contact is being made.
  • Operate the transponder on code as prescribed on the basis of regional air navigation agreements.
  • Operate the transponder on code 2000, in the absence of any ATC unit.

When requested by ATC to confirm squawk (code), the pilot shall:

  1. Verify the code setting on the transponder
  2. Reselect the assigned code if necessary
  3. Confirm to ATC the setting displayed on the controls of the transponder
Pilot shall not SQUAWK IDENT unless requested by ATC.

Transponder mode

IvAp shall be considered as a type mode S transponder on the IVAO network.

Other modes can be programmed when filling the flight plan using the adequate letter.

Transponder status

The transponder has two settings on IVAO:

  • STBY (associated with the orange spot)
  • TX (associated with the green spot) can be considered as ALT real mode.

IvAp interface:
Ivap transpondeur mode.PNG

X-IvAp interface:
Xivap transponder mode.PNG

All pilots must:
  • Set transponder to STDBY position before connecting to the IVAO network
  • Set transponder to STDBY position on apron and during taxi
  • 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 all the time
  • Set transponder to STDBY position after vacating the landing runway
As a pilot in command, you must set your transponder code yourself.
During formation flights, only the leader has to set his transponder on TX. The other aircraft must maintain visual contact with the leader and will keep their transponder on the STDBY position.
There is no OFF mode in IVAO transponder equipment. Equipment lower position is always standby. In conclusion, you cannot disappear from the IVAO radar. TA and TA/RA mode are simulated using the IvAp TCAS system

Transponder IDENT

When an air traffic controller wants to locate you quickly, he can request a “transponder ident” to the pilot. The pilot accordingly will press the IDENT or ID button of his IvAp interface when requested by the ATC.

IvAp interface:
Ivap transpondeur ident.PNG

X-IvAp interface:
Xivap transponder mode.PNG

Note that the pilot must press the IDENT button only when requested to do a “transponder IDENT” or “SQUAWK IDENT” procedure from an air traffic controller.

Transponder code

The pilot shall tune the transponder code using the IvAp interface (.x command) or instrument in the cockpit. The air traffic controller will receive the transponder code displayed on the IvAp interface.

In phraseology, controllers use the term “squawk” before sending a transponder code.

Example “Squawk 2103”.

When entering a control zone, the pilot shall initiate communications with the active ATC. After first contact, the controller can assign a new transponder code. The pilot shall tune it without delay.
When leaving a control zone or when flying in uncontrolled airspace, a pilot shall tune the default transponder code in accordance with his navigation rules even if not requested by ATC.

Example: Set transponder to 2000 ( IFR non controlled code)


You fly IFR in Uruguay in a non-controlled zone; a Brazilian controller outside your flight zone gives you 0535
transponder code => you must keep 2000 or tune 2000 if you forgot to tune it.
You fly IFR in Uruguay in a non-controlled zone; a Brazilian controller outside your flight zone gives you 2000

transponder code => you must tune 2000 as this is a non-controlled transponder code.

See also


  • none


  • VID 150259 - Creation
  • VID 150259 - Wiki integration


  • 01:57, 12 January 2022


  • This documentation is copyrighted as part of the intellectual property of the International Virtual Aviation Organisation.


  • The content of this documentation is intended for aviation simulation only and must not be used for real aviation operations.