Ill. Admin. Code tit. 92, § 14.810
2) the heliport’s size and layout;
5) whether the adjoining areas are free from obstructions based on a
proper glide ratio;
9) the minimum standards contained in this Subpart H, including Section
c) Modification of Certificate of Approval. The Division will issue a new Certificate of Approval after completion of a heliport extension or alteration that requires a modification to the Certificate of Approval in accordance with Section 14.120(b). For purposes of this Section the phrase, "extension or alteration" shall include the following:
14.Appendix G, Illustrations A, B and C and Section 14.Appendix H, Table A. (See Section 48 of the Act.)
2) change in any approach/takeoff path by more than 30 degrees; or