Aspen/Pitkin County Airport Fly Green/Fly Clean Annual 2018 Report (November 1, 2017 – October 31, 2018) ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 1 Annual 2018 Report ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 2 Annual 2018 Report This Page Intentionally Left Blank ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 3 Annual 2018 Report Table of Contents 1. Introduction -------------------------------------------------------------------------------------------------------------- 5 2. Program Overview and Goals ---------------------------------------------------------------------------------------- 6 3. 4. 2.1 Definition ---------------------------------------------------------------------------------------------------------- 6 2.2 Program Elements ------------------------------------------------------------------------------------------------ 6 2.2.1 Fleet Noise Quality Rating Methodology ------------------------------------------------------------- 7 2.2.2 High Noise Events Methodology ----------------------------------------------------------------------- 9 Program Results------------------------------------------------------------------------------------------------------- 14 3.1 Fleet Quality Results. ------------------------------------------------------------------------------------------ 14 3.2 High Noise Event Results. ------------------------------------------------------------------------------------ 16 2018 Annual Awards – Fly Green/Fly Clean ------------------------------------------------------------------- 20 4.1 5. Part 135 Operators --------------------------------------------------------------------------------------------- 23 Overall Fly Green/Fly Clean Airport Evaluation --------------------------------------------------------------- 24 Table of Figures Figure 1 - FAR Stage 3 Limits and Certificated Noise Levels ------------------------------------------------------- 8 Figure 2 - Noise Monitoring Locations --------------------------------------------------------------------------------- 10 Figure 3 - Loudest Noise Events, Winter 2017– Woody Creek --------------------------------------------------- 12 Figure 4 - Loudest Noise Events, Summer 2017 – Woody Creek------------------------------------------------- 13 Figure 5 - Fleet Quality Rating, FAR Part 135 Operations with more than 30 departures per day --------- 17 Figure 6 - Fleet Quality Rating, FAR Part 135 Operations --------------------------------------------------------- 18 Figure 7 - Low Score Fleet Quality Rating, Single Operators ----------------------------------------------------- 19 Figure 8 - High Score Fleet Quality Rating, Single Operators, Part 1 -------Error! Bookmark not defined. Figure 8 - High Score Fleet Quality Rating, Single Operators, Part 2 -------------------------------------------- 20 Figure 8 - High Score Fleet Quality Rating, Single Operators, Part 3 -------------------------------------------- 21 Figure 9 - Historic Overall Airport Comparison ---------------------------------------------------------------------- 24 ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 4 Annual 2018 Report Aspen/Pitkin County Airport Fly Green/Fly Clean Annual 2018 Report (November 1, 2017 through October 31, 2018) 1. Introduction Aspen/Pitkin County Airport’s Fly Green/Fly Clean is an initiative implemented by Pitkin County for the purpose of encouraging operators to operate as quietly as possible at the Airport. The program promotes a voluntary participatory approach in complying with noise abatement procedures and objectives by grading an operator’s performance and by making the scores available to the users of the Airport and the public via newsletters, publications, and public meetings. Fly Green/Fly Clean is intended to grow and change as new procedures and new technologies for aircraft and airspace are available. Initially, the Fly Green/Fly Clean Program will evaluate two categories: 1. Fleet Quality of the entire fleet at ASE, and 2. High Noise Events In order to fairly and accurately evaluate the operators, they are divided into two groups; those operators with more than 30 operations a year, and those with less than 30 operations per year. Within these two groups, operators are categorized based on the type of operators; either Part 135, which incorporates fractional and charter operations, and single owners or small fleets (single aircraft). The historical base period of evaluation for Fly Quiet is a 2-year period prior to the start of the Fly Quiet Program (from November 1, 2005 – October 31, 2007). This base period will allow the Airport to compare future Fly Green/Fly Clean documents to measure improvements. The program can be expanded as additional radar and noise monitoring capabilities are available. Scores are computed, and reports are generated once a year that includes both reporting season. The reporting seasons are; winter, November 1 – April 30, and summer, May 1 – October 31. This report presents the Annual 2018 results. This includes both the winter and summer season results. The winter period is from November 1, 2017 through April 30, 2018 while the summer period is May 1, 2018 through October 31, 2018. Fly Green/Fly Clean is a dynamic venue for implementing noise abatement procedures by praising and publicizing active participation rather than a system that admonishes violations from essentially voluntary procedures. ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 5 Annual 2018 Report 2. Program Overview and Goals The goal of the Aspen/Pitkin County Airport’s Fly Green/Fly Clean Program is to influence operators to operate as quietly as possible at Aspen/Pitkin County Airport. Monitoring, collecting, and analyzing comprehensive amounts of operational and noise data highlights both Airport trends and individual operator performance for specific noise abatement issues. A successful Fly Green/Fly Clean Program can be expected to reduce both single event and total noise levels around the Airport. Fly Green/Fly Clean data is quantified and translated into bi-annual reports, or scorecards, for individual operators and fractional operators. A summary of the scorecard will be published for the winter and summer periods, and a full report will be published for public distribution for the same time period. 2.1 Definition The purpose of the Fly Green/Fly Clean Program is to, through positive reinforcement, communicate to the aircraft operators the accepted noise abatement procedures and request that pilots fly them as efficiently as possible. The Fly Green/Fly Clean Program uses current available information, and may be expanded to include additional information. Existing data sources include third party radar data, seasonal noise monitoring, and observations of operations by Airport and consultant staff. This information is organized and analyzed in a software program to reveal a variety of comparative patterns showing the relative noise contribution of operators and aircraft types. These results are then processed into a 0 – 10 rating system so that it is easy to show which operator is the best in each category and how each operator rates overall. The Fly Green/Fly Clean Program covers two areas: fleet quality and high noise events, but will be expanded over time to cover other issues, both in the air and on the ground. The bi-annual report scorecard grades each Fly Green/Fly Clean category on a 10 point scale, awarding the best operator in each category the highest possible score, 10 points. Any operator that does not participate or have a documented occurrence or performance in any category, with the exception of the high noise event category, will receive a not applicable rating. Operators that have no recorded or documented high noise events, however, will be automatically awarded 10 points for the given analyzed time period. It is important to emphasize that the primary purpose of the Fly Green/Fly Clean report is to motivate operators by rewarding good noise abatement procedures, thus reducing noise intrusion. By providing this information publicly, Fly Green/Fly Clean enables operators to engage in informed self-evaluation and improvement. Positive reinforcement and good publicity is expected to be a strong incentive for operator performance. 2.2 Program Elements Currently, the Fly Green/Fly Clean Program consists of two elements: the overall noise quality of all aircraft operating at ASE and an evaluation of single overflight noise levels. As stated previously, the base period reporting period for these elements is average of November 1, 2005 through October 31, 2007. All subsequent bi-annual and annual Fly Green/Fly Clean reports will then be compared to this initial reporting period to determine the effectiveness of the program. ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 6 Annual 2018 Report 2.2.1 Fleet Noise Quality Rating Methodology Goal The goal of fleet noise quality rating is to have aircraft operators schedule their quietest aircraft at the Airport and be acknowledged for doing so. The Fly Green/Fly Clean Program Fleet Noise Quality Rating (FNQ) evaluates the noise contribution of each operator’s fleet as it actually operates at ASE. Methodology This category rates single aircraft owners as well as fractional jet operations. The Fleet Noise Quality Rating score presents an overall Airport score and a list of operators that performed above average. The method for quantifying a fleet noise quality rating at Aspen is based on established federal noise certification data for each aircraft. Stages 2 and 3 were established by Federal Aviation Regulation Part 36 which mandated the allowable noise levels for the manufacture of aircraft at three measurement locations. For each aircraft type, Part 36 specifies allowable noise levels at three measurement locations: approach, departure, and sideline. The FNQ rating uses third party radar data to determine the aircraft type for each operation at ASE. The radar data provides a list of each operation that occurs at ASE, including the aircraft type, time of operation and type of operation (VFR or IFR). The aircraft information will be used to determine the type of aircraft and if it is Stage 2 or Stage 3. The rating method for the FNQ totals the difference between each aircraft’s certified noise levels at all three measuring points and the Stage 3 and Stage 2 standard for that weight and number of engines. Aircraft with the lowest (i.e. quietest) noise levels are rated the best. An operator with aircraft certified close to borderline Stage 3 limits is rated low, while an operator with aircraft certificated noise levels quieter than Stage 3 limits rated higher. For Aspen/Pitkin County Airport, the departure value is weighted heavier than the approach and sideline noise due to the more widespread and intrusive nature of departure noise. Figure 1 depicts the noise characteristics of two aircraft types: a Cessna Citation and a Beech Jet. Both aircraft are certified as Stage 3, yet the combined noise levels at all three Part 36 measuring points for the Cessna Citation is 35.5 dB lower than the Stage 3 requirements, while the Beech Jet falls only 7.3 dB below the requirements. The red line at the top of each column represents Stage 3 limits; the blue portions of the columns indicate actual monitored certificated noise values. ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 7 Annual 2018 Report Figure 1 - FAR Stage 3 Limits and Certificated Noise Levels Aspen/Pitkin County Airport Fly Green/Fly Clean Source: BridgeNet International The aircraft fleet at Aspen/Pitkin County Airport is primarily composed of commercially operated regional jets, business jets, high performance turbo-prop aircraft, and general aviation propeller aircraft. The Airport is served by a variety of business jet aircraft, with a percentage certified as Stage 2 and louder “marginal” Stage 3. The fleet noise quality rating pertains to the general aviation fleet; both based aircraft and frequent users of the Airport are scored through this system. ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 8 Annual 2018 Report 2.2.2 High Noise Events Methodology Goal The goal of the Loudest Noise Event category is to reduce and eliminate the highest single event noise levels of aircraft operating at Aspen/Pitkin County Airport. Methodology The Loudest Noise Events score rates arriving and departing aircraft for excessive single event (SEL) noise levels, which are a convenient method for describing noise from individual aircraft events. An SEL is calculated by summing the decibel (dB) level for each second during a noise event and compressing that noise into one second. A noise event is defined as a takeoff or landing for the purpose of the Fly Green/Fly Clean Program. It is the level the noise would be if it all occurred in one second. The SEL value is the integration of all the acoustic energy contained within the event. This metric takes into account the maximum noise level of the event and the duration of the event. For aircraft flyovers, the SEL value is numerically about 10 dBA higher than the maximum noise level. Whenever an aircraft operation surpasses a high noise event threshold established for a remote noise monitoring site (RMS), a “loud single event” occurs. Loud noise events are measured by the Airport’s RMS’s situated in the communities surrounding the airport twice per year, two weeks in the winter and two weeks in the summer. The winter measurements are during the peak Christmas period and the summer period is around the peak 4th of July period. Table 1 shows the address and latitude/longitude of each RMS, and Figure 2 shows the locations of the RMS sites used to determine historical single event noise levels at each of the sites. For the Fly Green/Fly Clean measurement periods, the Woody Creek RMS was used to measure high noise events. Future Fly Green/Fly Clean reports will be expanded to include high noise event calculations at multiple RMS sites. At the Woody Creek measurement location (Site 4), since 2006, a year around noise monitor has been placed to continuously measure the aircraft noise levels throughout the year. This location is now being used in the Fly Quiet program to determine when high noise events occur anytime throughout the year, not just the peak summer and winter monitoring period. Past measurements were for just the peak summer and winter periods. Table 1 Noise Monitoring Locations Aspen/Pitkin County Airport Fly Green/Fly Clean Sites 1 2 3 4 5 6 Name S Airport N Airport W/J WC LWC NWC Location Longitude Latitude South Airport Boundary North Airport Boundary W/J Ranch Woody Creek – 262 Woods Rd. Little Woody Creek Woody Creek – 240 Doc Henry Rd. -106.8647666 -106.8744833 -106.8784500 -106.8878330 -106.8779167 -106.8935666 39.2121166 39.2349166 39.2537000 39.2668000 39.2769167 39.2797330 ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 9 Annual 2018 Report Figure 2 - Noise Monitoring Locations Aspen/Pitkin County Airport Fly Green/Fly Clean ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 10 Annual 2018 Report Historic single event noise data was used to help identify high noise level thresholds at the Woody Creek monitoring site. The historical data was used set to identify a high noise level threshold for aircraft producing noise levels higher than are typical for the majority of operations. To determine the recommended Loudest Aircraft Noise Event at the Woody Creek site the standard deviations were calculated. The resulting number equates to approximately 1% of all operations that are anticipated to be above the high noise level threshold. For the High Noise Level threshold, any noise event that generates an SEL of 90 dBA or greater is considered a high noise event. Whenever an aircraft overflight produces noise levels higher than the maximum allowable decibel value established for a particular monitoring site, the noise threshold is surpassed and a high noise event occurs. This category will be expanded over time to include additional RMS measurements of high noise events. Figure 3 shows the Loudest Noise Events results for the 2017/18 winter period, November 1, 2017 – April 30, 2018. The high noise threshold is 90 SEL. Figure 4 shows the Loudest Noise Events for the 2018 summer measurement period, May 1, 2018 – October 31, 2018. Both of the measurement period Loudest Noise Events are shown for the Woody Creek RMS, located north of the Airport. While there were additional noise events above 90 SEL, these were the Top 25 for the measurement period. These events were nearly all generated by the older generation-built aircraft such as the Gulfstream II/III and Falcon Jets. ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 11 Annual 2018 Report Figure 3 - Loudest Noise Events, Winter 2017/2018– Woody Creek Aspen/Pitkin County Airport Fly Green/Fly Clean Period November 1, 2017 – April 30, 2018 ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 12 Annual 2018 Report Figure 4 - Loudest Noise Events, Summer 2018 – Woody Creek Aspen/Pitkin County Airport Fly Green/Fly Clean Period: May 1, 2017 – October 31, 2017 ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 13 Annual 2018 Report 3. Program Results The results are presented in two categories. One category is the operations for FAR Part 135 aircraft that include fractional jet ownership and charters (operators that fly a fleet of different aircraft similar to an airline). The second category is operations for single owners or small fleets (single aircraft). These aircraft are not operated as part of a fractional jet ownership program or charter, and normally fly under a tail number not an airline operator code. Note that this is not an exact method of categorizing the aircraft, in that some charters will fly different aircraft both under an airline operator code and by its tail number. Where possible, charters that operate as a tail number were assigned their respective airline operator code. The intent is to separately evaluate those operators that fly a fleet of aircraft and those that operate just one aircraft or a small fleet. In order to fairly and accurately report how aircraft performed, the two categories of operators noted above are grouped into those operators with more than 30 operations per year and those operators with less than 30 operations per year. The Fly Green/Fly Clean 2017 program results are presented in Figures 5 through 8. Figures 5 and 6 graphically shows the operations for FAR Part 135 operations that include fractional jet ownership and charters. Figure 7 graphically shows the operations for single operators, or aircraft not operated as part of a fractional jet ownership program for the low scoring operators. Figure 8 presents the corresponding data for the high scoring single operators. In all of the figures, those operators with high scoring values are highlighted in GREEN. This is a Fleet Quality rating of 9 or better with no High Noise Level events (on a 0 to 10 scale with 10 being the highest rating). Average values are shown in BLUE. This is a Fleet Quality Rating between 4 and 9 and no high noise events. Low scoring values are shown in YELLOW. This is a Fleet Quality Rating of below 4 and at least one High Noise Level event. Operators with less than four operations per year were not included in the Program unless they generated a high noise event. If they generated a high noise event during the year, then they are included. All operations are compared back to the base period levels. The base period is the two years prior to the start of the Fly Quiet program (November 1, 2005 through October 31, 2007). The color codes for the different scores are shown below. 3.1 Rating Fleet Quality Score High Noise Events Good 9 to 10 0 Average 4 to 9 0 Poor Below 4 >=1 Color Fleet Quality Results. FAR Part 135 Operators ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 14 Annual 2018 Report The fleet quality results for the Part 135 operators are presented in Figures 5 and 6. The graphic shows the operations for FAR Part 135 operations that include fractional jet ownership and charters. The figures show the aircraft Fleet Noise Quality (FNQ) scored on a 0-10 scale, with 10 being the best possible in the available fleet and 0 being a Stage 2 or marginal Stage 3 aircraft. For each operator, the first two columns in the figure shows their base period number of departures and their corresponding FNQ score. The next columns show the number of departures during the winter, summer and annual periods along with the corresponding FNQ. Any score above 9 is considered good (green). Any score between 4 and 9 is average (blue). Any score less than 4 is considered poor (yellow). For the operators with more than 30 departures per year, Xojet and Jetsuite Air had the highest FNQ scores of 9.9. For the smaller operators with less than 30 departures per year, the top operators earned a FNQ score of 10, Lion Airlines, Tradewind Aviation, DRL – Unknown, and OHC - Unknown. The second to last column in the figure also show the change in the 2017 annual FNQ relative to the base period (2006/2007) FNQ. Any improvement in FNQ of 1 or more is considered good (green). Any decrease in FNQ of 1 or more is considered poor (yellow). For the operators with more than 30 departures per year, Citation Air had the most improvement. For operators with less than 30 departures, airline code RJC had the most improvements. The last column is the number of high events, which will be covered in the next section. The operators are shown in descending order, with aircraft that operated above the airport wide average on the top. The middle blue line marks the average overall score for the Airport, which for the 2017 reporting period is 8.1 out of 10. This is an improvement 1.4 FNQ over the base period (2006/2007) of 6.7, and a 0.2 increase over the previous year’s FNQ. Single Operators Figure 7 shows the results for single aircraft operators that scored on the bottom of the FNQ. These aircraft had at least 4 departures per year, and a FNQ score of 0. The 0 score is a result of flying older, louder Stage 2 and marginal Stage 3 aircraft. The figure shows the tail number, type of plane, registered owner, the number of departures in the winter, summer and annual period along with the FNQ score. The number of high noise events is also shown. In addition to those operators that had 4 or more departures per year, any aircraft that generated a high noise event is also listed. Figure 8 shows the results for single aircraft that scored on the top of the FNQ. These aircraft had at least 6 departures per year, and a FNQ score of greater than 9. The 9 or greater score is a result of flying new generation Stage 3 and Stage 4 aircraft. The figure shows the tail number, type of plane, registered owner, the number of departures for the annual period along with the FNQ score. There were no high noise events generated by these aircraft. The operator with the most number of operations flying an aircraft with a FNQ of 9 or greater was registered to Terrapin Aircraft, LLC. There were 146 single aircraft operators with aircraft with a FNQ of 9 or more and had at least 6 departures per year. This is up from last year’s high of 109 aircraft with a FNQ score of 9 or higher. ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 15 Annual 2018 Report 3.2 High Noise Event Results. The high noise events were incorporated into the Fly Green/Fly Clean program with the results presented in Figures 5 through 7. The Part 135 Operators data in the last column of Figures 5 and 6 shows that there were nine Part 135 operators that generated high noise events throughout the year, with a total of eleven events. These results for the single aircraft operator’s high noise events are presented in the last column of Figure 7. The results show that the majority of the high noise events are as a result of operations by the older louder Stage 2 and marginal Stage 3 aircraft that are flown by single aircraft owner/operators. It is an important observation that there were no high noise event associated with aircraft that had a good FNQ. ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 16 Annual 2018 Report Figure 5 Fleet Quality Rating, FAR Part 135 Operations with more than 30 departures per day Aspen/Pitkin County Airport Fly Green/Fly Clean Airport Average FNQ Score 8.3 ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 17 Annual 2018 Report Figure 6 Fleet Quality Rating, FAR Part 135 Operations with less than 30 departures per day Aspen/Pitkin County Airport Fly Green/Fly Clean ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 18 Annual 2018 Report Figure 7 - Low Score Fleet Quality Rating, Single Operators Aspen/Pitkin County Airport Fly Green/Fly Clean ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 19 Annual 2018 Report Figure 8 - High Score Fleet Quality Rating, Single Operators, Part 1 Aspen/Pitkin County Airport Fly Green/Fly Clean ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 20 Annual 2018 Report Figure 9 - High Score Fleet Quality Rating, Single Operators, Part 2 Aspen/Pitkin County Airport Fly Green/Fly Clean ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 21 Annual 2018 Report Figure 10 - High Score Fleet Quality Rating, Single Operators, Part 2 Aspen/Pitkin County Airport Fly Green/Fly Clean ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 22 Annual 2018 Report 4. 2018 Annual Awards – Fly Green/Fly Clean The following is a list of those operators that have achieved the goals of working towards improving the noise environment around Aspen/Pitkin County Airport. These awards are divided into the Part 135 operators that fly a fleet of corporate jets and the single aircraft operators that fly one or a small number of corporate jets operating under a tail number. 4.1 • Part 135 Operators Operators that flew the quietest fleet without any high noise events (30 or more departures per year) Operator Code XOJ RSP • Departures 301 71 Operators that flew the quietest fleet without any high noise events (less than 30 departures per year) Operator Code ASP DRL RIX • Operator XOJet Jetsuite Air Operator Aspen Airways Inc Omini Air Transport Rectrix Departures 8 19 7 Operators that were most improved from previous year (2017) DCM FltPlan (30 or more departures per year) WCC West Coast Air (less than 30 departures per day) • Honorable Mention of those Operators with a better than airport average fleet with no high noise events 30 or more Departures per year Operator Code Operator OPT Flight Options XSR Executive AirShare LXJ Bombardier FlexJet SIS Saber Airlines Departures 308 125 575 32 Less than 30 departures per year Operator Code RJC GCT TKK KAI Operator Richmor Aviation GC Aviation Aero Ways Inc Kaiser Inc Departures 6 19 8 13 ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 23 Annual 2018 Report 5. Overall Fly Green/Fly Clean Airport Evaluation The Fly Green/Fly Clean Program presents the Airport’s overall score and compares it to historical data. Figure 9 shows historical data for four categories: • • • • Change in Annual DNL Noise Level Change in Number of Average Daily Number of High Single Event Noise Levels Change in Size of Noise Contour Change in Percentage of Corporate Jet Stage 2 Operations Historical data for these categories is show for the years 2000 and 2003 – 2018. Each of the four categories shows significant improvement year over year. This report focuses on the 2018 Fly Green/Fly Clean Airport Reporting period. Stage 2 operations accounted for 0.4% of all corporate jet operations. The number of High Single Event Noise Levels average well less than one per day (0.1 events per day). The lower number of high noise events can be directly correlated with the continued reduction of Stage 2 corporate jet aircraft. Specifically, the older Gulfstreams (II and III) and the louder Stage 3 jets (Beach 400 and Falcon 50) It is anticipated that these levels will continue to lower as these aircraft retire from the fleet. As with the other airport rating categories, the size of the noise contour was slightly decreased at less than 1,100 acres in the 55 DNL. This can also be attributed to reduction of Stage 2 operations as well as an overall improvement of the fleet noise quality. ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 24 Annual 2018 Report Figure 11 - Historic Overall Airport Comparison (2018) Aspen/Pitkin County Airport Fly Green/Fly Clean Change in Annual DNL Noise Level* Change in Number of High Single Event Noise Levels* 56.0 Change in Size of Noise Contour 4 Change in Percent Corporate Jet Stage 2 Operations 15.0% 2250 3.5 2000 55.0 12.0% 53.0 2.5 2 1.5 Percent Stage 2 Corp. Jet Operations Annual DNL 54.0 Acres within 55 DNL Noise Contour Average Daily Events Above 90 SEL 3 1750 1500 1250 9.0% 6.0% 1 52.0 3.0% 1000 0.5 0 51.0 03456789012345678 0 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 Year Year 750 03456789012345678 Year 0.0% 03456789012345678 Year * DNL and SEL Noise Events from Woody Creek Measurement Site ________________________________________________________________________ Aspen/Pitkin County Airport Fly Green/Fly Clean Program 25 Annual 2018 Report