AMC1 ACNS.D.ELS.060 Antenna Installation
ED Decision 2013/031/R
(a) Antenna locations recommended by the aircraft manufacturer do not need to be revalidated.
(b) Antenna performance for new locations should be validated in flight by ground measurements or simulation modelling.
(c) The distance between ATC Transponder antenna should be at least 40 cm and the distance between ATC Transponder antenna and other antenna (e.g. ACAS, DME) should satisfy the appropriate isolation and longitudinal separation limits.
(d) When the Mode S ELS surveillance installation is using two antennas, the horizontal distance between the two antennas should be less than 7.6m
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