These regulatory actions are needed because of the adoption of new or revised criteria, or because of changes occurring in the National Airspace System, such as the commissioning of new navigational facilities, addition of new obstacles, or changes in air traffic requirements. These changes are designed to provide safe and efficient use of the navigable airspace and to promote safe flight operations under instrument flight rules at the affected airports. An effective date for each SIAP is specified in the amendatory provisions. The FAA Regional Office of the region in which the affected airport is located.
Materials incorporated by reference are available for examination or purchase as stated above.
The large number of SIAPs, their complex nature, and the need for a special format make their verbatim publication in the Federal Register expensive and impractical. Further, airmen do not use the regulatory text of the SIAPs, but refer to their graphic depiction on charts printed by publishers of aeronautical materials. Thus, the advantages of incorporation by reference are realized and publication of the complete description of each SIAP contained in FAA form documents is unnecessary. This amendment also identifies the airport , its location, the procedure identification and the amendment number. The circumstances which created the need for some SIAP amendments may require making them effective in less than 30 days.