11In section 15 of that Act (which provides for grants towards the cost of sound-proofing buildings)—
(a)for the words " an aerodrome owned or managed by the Authority " in subsection (1) there shall be substituted the words "a designated aerodrome within the meaning of section 29 of the Civil Aviation Act 1971";
(b)for the words from " by measures " to " Act " in subsection (1) there shall be substituted the words "by virtue of that section";
(c)for the words " Authority to " in subsection (1) there shall be substituted the words "person for the time being managing the aerodrome (hereafter in this section referred to as" the relevant manager ") to " ;
(d)for the word " Authority " in each place where it occurs in subsections (3), (4) and (6) there shall be substituted the words "relevant manager";
(e)for the word " its " in subsection (3) there shall be substituted the words "the relevant manager's"; and
(f)after the word " section " in subsection (6) there shall be inserted the words "relating to an aerodrome".