The protected areas the Deputy refers to, and mentioned in the earlier question in 2004, were put in place by orders made under section 14 of the Air Navigation and Transport Act 1950. The orders in question were made between 1988 and 1993, and relate to circular protected areas of 300 metres radius from the IAA's DVOR-DME equipment at Rowlestown West, County Dublin, Kilgarriff West, Charlestown, County Mayo and Knockaun, Shannon, County Clare.
The responsibility for these orders is now a matter for the Irish Aviation Authority, IAA. The 2005 SI that the Deputy refers to is the Irish Aviation Authority (Protected Area) Order 2005, and was made by the IAA on 5 December 2005. This order puts a similar circular protected area of 300 metres radius from the IAA's DVOR-DME equipment at Ballygarvan and Lehenaghmore in County Cork. The IAA has informed me that it will be happy to deal with any query that the Deputy puts to them in relation to the protected areas.
I should clarify for the Deputy that there is no requirement in the 1950 Act, or under the Irish Aviation Authority Act 1993, to identify landowners in advance of making the orders.