Automatic Dependent Surveillance-Broadcast (ADS-B) is a system broadcasting, without the need for action from the pilot or any request from ATC, that provides an enhanced set of aircraft surveillance data to Air Traffic Management (and potentially to other airplanes)

Dual transponder system ADS-B upgrade in Part 25 aircraft

Mode-S Enhanced Surveillance (EHS) Upgrade. EASA.A.S.03688

Enabling of Traffic Collision Avoidance System II (TCAS II)inaccordance with Cranfield Aerospace Ltd. Document CA/DD/R2122, issue Bdated June 2004 or later EASA approved revision. Flight ManualSupplement Cranfield Supplement No 1 to CAA approved Flight ManualDocument No. J41-01. EASA.A.S.00186

TCAS II Upgrade to Version 7.1