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Airspace Usage requirements

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Airspace Usage requirement (ACAS II v7.1)

What does the Commission Regulation (EU) No 1332/2011 require by 01 December 2015?

Is it possible to be exempt from the requirement to be equipped with collision avoidance logic version 7.1 ( ACAS II V7.1) for a limited period of time, for only one flight, for the execution of a ferry flight per maintenance purposes, for the execution of a non-commercial air transport flight (i.e. general aviation flight) or for a State flight? And what if I have technical difficulties to upgrade my aircraft before 01/12/2015?

I voluntarily installed ACAS II V7.0 on my aircraft even it was not required to. Do I have to upgrade to ACAS II V7.1?