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How is the Special Position Identification (SPI) pulse transmitted?

  • A

    By the SSR interrogator if it is suspected that responses are received from aircraft that are located in the direction of the side lobes of the interrogator antenna.

  • B

    By the SSR interrogator in order to request the identification of an aircraft.

  • C

    By the transponder as a result of the pilot pushing the IDENT button.

  • D
    Automatically when the transponder responds to a mode A interrogation.

The pilot may manually transmit a Special Position Identification (SPI) pulse when the "IDENT" button on the pilot's transponder is pressed. The benefit of the squawk "IDENT" function is a manual identification of the aircraft. The controller may ask via the radio communication frequency to "IDENT" in case of any doubt of identification on the controller display. Upon acquisition of the SPI pulse, the transponder indication begins to flash on the display of the controller. This produces a distinctive display so that a controller can pick out a particular aircraft by asking the pilot to “Squawk Ident”.

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