Mode-S Rule Proves Debacle in Holland
Holland’s recent experience with the consequences of requiring all aircraft to be equipped with mode-S transponders may prompt a revision of similar rules

Holland’s recent experience with the consequences of requiring all aircraft to be equipped with mode-S transponders may prompt a revision of similar rules by other national aviation authorities.

Several years ago the EASA chose Holland for a trial of mode-S transponders that led to a directive by the Dutch CAA that all aircraft operating within Dutch airspace, including gliders and micro-lights, were to be fitted with this transponder by 2007.
AOPA Netherlands and other organizations lobbied for light aircraft to continue to use mode-C, pointing out that this already met the requirements for TCAS alerts and suitable mode-S equipment would not be available within the time frame. The authorities held to their position but agreed to delay the upgrade until March 12 this year.