Definitions. Acoustic terminology definitions used in this regulation have the same meanings as stated in COMAR 11.03.03.01A. MTN Airport Noise Zone. The MTN Airport Noise Zone is established pursuant to the Maryland Environmental Noise Act of 1974 (Transportation Article, §§5-805, 5-806, and 5-819, Annotated Code of Maryland). The Executive Director shall update and recertify the Airport Noise Zone as required, by developing contours of equal noise exposure using day-night average sound levels (Ldn) to determine the extent of impacted land uses. The Martin State Airport — Airport Noise Zone, certified by the Executive Director, and consisting of the 65, 70, and 75 Ldn contours overprinted on county tax maps as follows, is incorporated by reference at COMAR 11.03.01.01-1B(6): Airport Noise Zone Map; Tax Map index; Baltimore County Tax Maps 90 and 91. The noise zone is a composite of the 65, 70, and 75 Ldn noise contours for the base year of 2019 and future years of 2025 and 2030. The noise zone reflects the projected future use of the Airport, including existing and planned projects in the Master Plan or Capital Program that influence future Airport use. MTN Noise Abatement Plan. The MTN Noise Abatement Plan is established pursuant to the Maryland Environmental Noise Act of 1974 (Transportation Article, §§5-805, 5-806, and 5-819, Annotated Code of Maryland). The Executive Director shall review and update the MTN Noise Abatement Plan as required. Compliance with the MTN Noise Abatement Plan. All entities which use the Airport facilities shall comply with the MTN Noise Abatement Plan. The Maryland Air National Guard, the Maryland State Police, and local law enforcement agencies are exempt from the provisions of this regulation when operational necessity dictates noncompliance, or in the event of a State or national emergency. The elements contained in the MTN Noise Abatement Plan are as follows: Airport Noise Zone (ANZ); Control of Incompatible Development; Noise Concerns; Maryland Air National Guard (MDANG) Noise Barriers; Aircraft Maintenance Engine Run-up Areas; and Noise Abatement Procedures including Visual Flight Rules (VFR) and Instrument Flight Rules (IFR) Departures, VFR and IFR Arrivals and Traffic Patterns, Closed Traffic Patterns, and Touch-and-Go or Practice Approaches.