By F12 January 2020 at the latest F2the CAA shall ensure that a secondary surveillance radar transponder on board any aircraft flying over F3the United Kingdom is not subject to excessive interrogations that are transmitted by ground-based surveillance interrogators and which either elicit replies or whilst not eliciting a reply are of sufficient power to exceed the minimum threshold level of the receiver of the secondary surveillance radar transponder.

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By F12 January 2020 at the latest F5the CAA shall ensure that the use of a ground based transmitter operated in F6the United Kingdom does not produce harmful interference on other surveillance systems.

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