18. This Chapter applies to—
(a)major airports; and
(b)non-designated other airports if aircraft noise results in an Lden value of 55 dB(A) or greater or an Lnight value of 50 dB(A) or greater anywhere in first round agglomerations or agglomerations,
and the competent authority is the airport operator.
19.—(1) No later than 30th April 2008 the competent authority must—
(a)draw up an action plan for places near the airport; and
(b)submit that action plan to the Secretary of State.
(2) Paragraph (3) only applies if the competent authority was not required to draw up an action plan for the airport pursuant to paragraph (1) because it was not the competent authority on or before 30th April 2008.
(3) No later than 30th April 2013 the competent authority must—
(a)draw up an action plan for places near the airport; and
(b)submit that action plan to the Secretary of State.
(4) Paragraph (5) applies—
(a)whenever a major development occurs affecting the existing noise situation; and
(b)at least every five years after the date on which an action plan is adopted pursuant to regulation 24.
(5) The competent authority must—
(a)review; and
(b)if necessary revise,
the action plan.
(6) An action plan revised pursuant to paragraph (5)(b) must be submitted to the Secretary of State within three working days of its revision.