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For flight outside controlled airspace, when is a transponder required?

  • A

    When you are entering a MATZ.

  • B

    When you are in the 'Open FIR'.

  • C

    When you are at FL100 or above.

  • D

    When inside an ATZ.

  • MATZ: Military Aerodrome Traffic Zone
  • ATZ: Aerodrome Traffic Zone
  • FIR: Flight Information Region

A transponder is required if flying in uncontrolled airspace when operating at or above Flight Level 100, unless specifically excluded by notified non-transponder areas for gliders. These non-transponder areas are defined in the UK AIP at ENR 6-63.

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