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05/08/1985 - Airport Relations Commission MINNEAPOLIS /ST. PAUL METROPOLITAN AIRPORTS COMMISSION Analysis of Runway 22 Departures at MSP With and Without use of 180 Heading Procedure May 8th, 1985 HOWARD NEEDLES TAMMEN & BERGENDOFF Rev. 1 1 Analysis of Runway 22 Departures at MSP With and Without Use of Procedurean Turn to 180 Heading A. General Runway 22 at MSP is used as a preferential runway for aircraft depar- tures when the capacity of parallel Runways 11L /29R and 11R/29L is not needed. During periods of heaviest use of the Runway, it accommodates 40 departures in a one hour period. This volume typically includes 26 air carrier jets, 11 air carrier propeller aircraft (from April 1985 schedule) and 2 business jets. On an annual basis, records kept by MAC indicate that Runway 22 is used by approximately 18% of all departures. Prior to 1984, aircraft departing Runway 22 were generally assigned to a heading of either 200 °, 220 ° , 250 or 350 °. depending upon their route of flight. The distribution of flights to these headings was estimated by MAC as follows: Heading Percentage of Flights 200 43% 220 34% 250° 5% 350 18% Starting in December of 1982, a "test" was conducted over a 24 month period of the effects of utilizing a 180° heading for Runway 22 depar- tures heading south and east. Air traffic control utilized the new heading in place of the 200 heading whenever it was possible to do so without restricting traffic flows. The resultant heading usage during the text period was as follows: Heading Percentage of Flights 180° 35% 220 42% 250 5% 350° 18% 100% The principal difference in the two cases is that the use of the 200 heading (43 %) in the non -test situation is replaced by use of the 180 heading (35 %) under test conditions. There is an additional increase of 8% in use of the 220 heading. The analysis that follows quantified the noise effects of the test pro- cedure compared to non -test conditions. This comparison of aircraft noise levels in the two conditions uses two different indices of noise - Daily Ldn noise contours, and single event takeoff noise contours. B. Ldn Noise Analysis An Ldn contour for 1985 traffic without the test procedure was calcu- lated using FAA's Integrated Noise Model Version 3.8. The contour includes the non -test flight track usage described in Section A above, with the 18% annual use of Runway 22 for departures. A second Ldn contour set was then generated with the same assumptions as the base case contour, except that aircraft departing Runway 22 were assigned to flight tracks according to the "test" conditions cited above. The two Ldn contours were compared with respect to the population removed from or added to the Ldn 65 contour as a result of the procedural change. Under non -test conditions, there are 1532 persons affected by the Ldn 65 who are not within the test case Ldn 65. On the other hand, 432 persons are included in the test case Ldn 65 that are not within the base case Ldn 65. The differences in these two popula- tion figures, 1100, is the net number of people which benefit by the use of the 180 turn procedure. C. Single -Event Contour Analysis A second technique utilized to measure the noise effects of the test procedure was the identification of residential population that would experience maximum noise levels of 75 or 85 dBA as a result of a single aircraft flying the non -test and test procedures. A 727 -200 aircraft flown according to the Northwest Airlines procedure (for a less than 1000 mile trip) was utilized as the single -event occurrence, being the most frequent operation at MSP. The first of the two single -event con- tour levels selected, 85 dBA, represents the area of higher noise levels, while 75 dBA represents the area of moderate noise levels but where aircraft noise could still interfere with normal conversational noise levels. 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