NEW SMYRNA BEACH MUNICIPAL AIRPORT AIRPORT MASTER PLAN UPDATE
CLEAR ZONE - Clear zone or runway clear zone means an area at ground level underlying a portion of the approach surface. The term “clear zone” has been redesignated by the FAA to Runway Protection Zone (RPZ). Under either usage, the zone extends to a point on the ground where the approach surface reaches fifty (50) feet above the runway end elevation. (See RUNWAY PROTECTION ZONE)
CONTOUR - See NOISE CONTOURS.
DATE OF BENEFICIAL OCCUPANCY (DBO) - The date on which the replacement terminal facilities are as substantially complete that they are usable by Airport tenants and the public without hazard or undue inconvenience.
DAY-NIGHT AVERAGE SOUND LEVEL (DNL) - A method for predicting, by a single number rating, cumulative aircraft noise that affects communities in airport environs. The DNL value represents decibels of noise as measured by an A-weighted sound-level meter. In the DNL procedure, the noise exposure from each aircraft takeoff or landing at ground level around an airport is calculated, and these noise exposures are accumulated for a typical 24-hour period. (The 24-hour period often used is the average day of the peak month for aircraft operations during the year being analyzed.) Daytime and nighttime noise exposures are considered separately. A weighting factor equivalent to a penalty of 10 decibels is applied to operations between 10 p.m. and 7 a.m. to account for the increased sensitivity of people to nighttime noise. The DNL values can be expressed graphically on maps using either contours or grid cells. DNL may also be used for measuring other noise sources, such as automobile traffic, to determine combined noise effects. (See A-WEIGHTED SOUND LEVEL)
dBA - See A-WEIGHTED SOUND LEVEL.
DECIBEL (dB) - A unit for measuring the volume of a sound, equal to the logarithm of the ratio of the intensity of the sound to the intensity of an arbitrarily chosen standard sound.
DEPLANED PASSENGERS - The volume of passengers inbound to an airport. The annual passenger volume of an airport is the total of deplaned and enplaned passengers. (See ENPLANED PASSENGERS)
DEREGULATION ACT - Airline regulatory reform act of 1978. Designed, among other things, to encourage competition among domestic airlines, the Act allows an airline greater freedom to enter and leave any given market.
DETERMINATION - The term used by FAA to denote the outcome of an aeronautical study under FAA Part 77. (See HAZARD)
DEVELOPMENT OF REGIONAL IMPACT - The term applied to a proposed development that under Florida Statutes Chapter 380 has potential environmental, economic or other significant regional impact.
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