Short Term Monitoring Program VIC, Oak Park Report
CESSNA P337 · Other Documents
Overview
This report provides a technical summary of aircraft noise and operational data collected at Oak Park, VIC, over a four-week period. It focuses on the noise generated by aircraft movements from nearby airports, particularly Essendon and Melbourne Airports. The monitoring was conducted to assess the impact of aircraft noise on the local community, with data collected from an Environmental Monitoring Unit (EMU) located at Oak Park Primary School. The report includes detailed findings on noise levels, types of aircraft, and operational statistics, serving as a resource for understanding the environmental effects of aviation in the area.
- Monitoring period: August 11, 2012 - September 7, 2012.
- Total movements recorded: 5,176.
- Average noise level: 69.1 dB(A); maximum level: 94.4 dB(A).
- Cessna P337 average maximum noise level: 80.7 dB(A).
- Correlation of aircraft operations with noise events: 51%.
Document
Source
Originally published by www.airservicesaustralia.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Other Documents
- Year
- 2013
- Pages
- 11
- File size
- 915 KB
- Publisher
- www.airservicesaustralia.com
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In this document
Monitoring Period and Location
The monitoring took place from August 11, 2012, to September 7, 2012, at Oak Park Primary School, located at latitude 37°42'56.19"S and longitude 144°54'55.87"E. The Environmental Monitoring Unit (EMU) operated within a 2.5 km radius and captured noise data up to 8,274 ft above ground level.
Findings and Noise Summary
The report summarizes aircraft movements and correlated noise events. A total of 5,176 movements were recorded, with a correlation summary indicating a 51% match between aircraft operations and noise events. The average noise level recorded was 69.1 dB(A), with maximum levels reaching 94.4 dB(A). The report highlights that the majority of noise events exceeding 60 dB(A) occurred during the day.
Aircraft Noise Levels
The report identifies the top 10 noisiest aircraft types recorded during the monitoring period. Notably, the Cessna P337 was among the aircraft listed, with an average maximum noise level of 80.7 dB(A) during operations.
Correlation Summary
The correlation summary indicates that 54.84% of Essendon Airport movements were matched with noise events, while the overall correlation for all movements was 50.83%. This suggests that many quieter general aviation operations were not captured as noise events.
Conclusion
The report concludes that the most common aircraft movements affecting the Oak Park community are from Essendon Airport, with significant noise events occurring primarily during weekdays. The findings are intended to inform the local community and stakeholders about the impact of aircraft noise.
Full document text
Short Term Monitoring Program VIC, Oak Park Report April 2013 Short Term Monitoring Program VIC, Oak Park, April 2013 Version Control Version Number Date Detail 1.0 April 2013 Initial Release. 2.0 January 2014 Figure 5 and L90 figures updated due to technical issue. © Airservices Australia. All rights reserved. This report contains a summary of data collected over the specified period and is intended to convey the best information available from the NFPMS at the time. The system databases are to some extent dependent upon external sources and errors may occur. All care is taken in preparation of the report but its complete accuracy can not be guaranteed. Airservices Australia does not accept any legal liability for any losses arising from reliance upon data in this report which may be found to be inaccurate. Short Term Monitoring Program VIC, Oak Park, April 2013 1 Deployment Purpose – Oak Park, VIC Following recommendations made in the ‘Review of the Melbourne Environmental Monitoring Units’ undertaken by Airservices in 2012, Oak Park Primary School was selected as a Short Term Monitoring Location. All Essendon Airport movements are within close proximity of Oak Park as well as some Melbourne Airport Runway 34 (north/south runway) jet arrivals. The purpose of this report is to provide a technical summary of the recorded aircraft noise and operational data collected at Oak Park over a four week period. An explanation of terms used within this report can be found in the Glossary at the end of the report. Monitoring Period 11/08/2012 12:00am – 07/09/2012 11:59pm Environmental Monitoring Unit (EMU) Details Location Oak Park Primary School, Oak Park 3046 Latitude 37°42'56.19"S Longitude 144°54'55.87"E Capture Zone 2.5km radius with 8,274ft (above ground level) height for noise data capture EMU Altitude 275ft above mean sea level Threshold Settings 54.0 dB(A) to 60.0 dB(A) depending on time of day Location Images Figures 1 to 3 details the location of monitors surrounding Melbourne and Essendon Airport and the flight paths used for those operations captured by the Oak Park EMU. Short Term Monitoring Program VIC, Oak Park, April 2013 2 Figure 1 Melbourne and Essendon Fixed Environmental Monitoring Unit Locations and the Oak Park Short Term Monitoring Program Deployment Location Figure 2 Total Movements Captured Oak Park STMP Essendon Airport Point Cook Airport Moorabbin Airport Avalon Airport Melbourne Airport Short Term Monitoring Program VIC, Oak Park, April 2013 3 Figure 3 Essendon Airport Movements Captured Figure 4 Oak Park Movements Through Capture Zone Penetration Gate Note: Melbourne Airport altitude is 434ft above mean sea level. EMU altitude is 275ft above mean sea level. The EMU altitude should be adjusted from the data shown above in order to draw conclusions about height above ground of aircraft operations. The black line though the capture zone in Figure 3 is the penetration gate, which was crossed by all the flights shown in Figure 4. Some movements within the capture zone are not shown as they did not cross the penetration gate. Some flights may cross the penetration gate more than once, at different altitudes. This may happen, for example, if a flight passes through the penetration gate at a low altitude soon after take off, then again having climbed to a higher altitude. Short Term Monitoring Program VIC, Oak Park, April 2013 4 Findings Table 1 Movement Summary (11/08/2012 12:00am – 07/09/2012 11:59pm) * Includes all aircraft with transponder flying through area, regardless of destination/origin airport. Correlation Summary An evaluation of the number of aircraft operations that were matched with noise events recorded by the EMU is an important aspect of assessing performance of the noise monitoring installation. Ideally, all operations passing the EMU within a reasonable proximity will be matched to the appropriate noise event. Whilst complete matching is not expected, a lack of matches will reveal the need to investigate the reason for anomalies. The correlation results for the Oak Park deployment are shown in Table 1. A correlation summary for all movements of 51% is a reasonably low result. This lower result is due to a combination of operations being captured by the edge of the zone and the quieter nature of General Aviation aircraft operations. Whilst the noise created from the aircraft may be noticeable, they are not loud enough to create a noise event above the determined threshold settings shown below in Figure 5. Table 2 Height Above The Monitor Summary Type of Operation Min Max Average Departures Through Capture Zone** 167 14,557 1,202 Arrivals Through Capture Zone** 160 8,817 1,968 All Operations Through Capture Zone** 160 14,567 1,796 ** Includes all airports within Melbourne Basin. Figure 4 shows Melbourne Airport Runway 34 jet arrivals typically fly within proximity of Oak Park between 2,000ft and 3,000 feet. Table 3 Captured Movements Breakdown By Airport and Aircraft Category Airport Jet Turboprop Light Propeller Helicopter Unknown* Grand Total Essendon 261 837 533 1,114 696 3,441 Melbourne 1,375 171 0 0 0 1,546 Moorabbin 2 0 125 1 5 133 Other 2 5 26 13 10 56 Grand Total 1,640 1,013 684 1,128 711 5,176 *These non-flight planned operations are generally recreational aircraft conducting private or training flights. Type of Operation Essendon Airport Movements All Movements Number of Movements Through Capture Zone* 3,441 5,176 Number of Correlated Noise Events (CNE) 1,887 2,631 Correlation Summary 54.84% 50.83% Short Term Monitoring Program VIC, Oak Park, April 2013 5 Background Noise Levels and Threshold Settings At the monitoring site, background noise levels are first assessed to determine the appropriate threshold settings for the noise monitor. The threshold setting must be above the background noise level in order to clearly distinguish aircraft noise events from other noise sources. The result of background noise assessment and threshold
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settings are provided below in Figure 5. Figure 5 Background and Threshold Assessment Short Term Monitoring Program VIC, Oak Park, April 2013 6 Noise Summary The following tables present a summary of the noise data for aircraft that flew through the capture zone and caused a Correlated Noise Event (CNE). Information is provided for Essendon Airport movements, as well as all aircraft that flew over the EMU, noting that this area is affected by arrivals, departures and training flights, as shown in Figure 2 and Figure 3. Table 4 Noise Summary NOISE PARAMETERS LAeq 24 hr, dBA 61.2 LAeq (night), dBA 57.9 Background Day (L90 dBA) 49.6 Background Night (L90 dBA) 43.5 Table 5 Correlated Noise Events Summary Essendon Airport Movements All Movements Total number of Correlated Noise Events (CNE 24hr) 1,887 2,631 Number of Correlated Noise Events at night (CNE night) 92 126 Operational Days 28.0 28.0 Number of Correlated Noise Events (CNExx) day/night CNExx CNExx CNE60 – day 1,766 2,451 CNE60 - night 72 102 CNE65 – day 1,392 1,825 CNE65 – night 30 46 CNE70 – day 838 1,029 CNE70 - night 13 20 CNE75 – day 395 463 CNE75 - night 7 10 CNE80 – day 117 138 CNE80 - night 3 4 Number of Correlated Noise Events (CNExx) per 24hr period min – max CNE60 12 to 118 13 to 187 CNE65 8 to 96 8 to 152 CNE70 6 to 72 6 to 104 CNE75 1 to 44 1 to 55 CNE80 0 to 16 0 to 21 Average Number of Correlated Noise Events (CNExx Ave.) day/night CNExx Ave. CNExx Ave. CNE60 Ave. – day 63.07 87.54 CNE60 Ave. – night 2.57 3.64 CNE65 Ave. – day 49.71 65.18 CNE65 Ave. – night 1.07 1.64 CNE70 Ave. – day 29.93 36.75 CNE70 Ave. – night 0.46 0.71 CNE75 Ave. – day 14.11 16.54 CNE75 Ave. – night 0.25 0.36 CNE80 Ave. – day 4.18 4.93 CNE80 Ave. – night 0.11 0.14 Note: Day period is from 6:00am to 11:00pm. Night period is 11:00pm to 6:00am. Short Term Monitoring Program VIC, Oak Park, April 2013 7 Table 6 LAmax Summary Min dB(A) Max dB(A) Average dB(A) 55.3 94.4 69.1 Note: Summary for operations that passed through the capture zone (2.5km radius with 8,274ft height AGL) CNE60 Count by Hour A large number of noise events were between 60dB(A) and 70dB(A). Therefore further investigation was undertaken on the number of correlated noise events that exceed 60dB(A) to reveal patterns and determine what time of the day the majority of these events occurred. Figure 5 presents daily average number of noise events 60dB(A) or above (CNE60) broken down on an hourly basis. Figure 6 Average CNE60 per Hour for Essendon Airport Movements The highest number of CNE60 in any one hour throughout the reporting period was 24 on the 27th August 2012 between 2pm and 3pm. Aircraft Noise Levels Table 7 presents the top 10 noisiest aircraft types captured by the noise monitor during the reporting period. Table 8 shows the 10 most correlated aircraft types that flew over the noise monitor. Table 7 Top 10 Average Aircraft Noise Levels (LAmax) at the Oak Park EMU Aircraft Type (Aircraft Category) Airport Operation Type Runway No. Correlated Noise Events LAmax dB(A) Highest No. CNE in One Day Average Maximum Beech BE76 (P) Essendon D 35 1 83.7 83.7 1 Cessna 337 (P) Essendon D 35 1 82.4 82.4 1 Rockwell Grand Commander (P) Essendon D 35 3 81.8 92.1 1 Cessna P337 (P) Essendon D 35 1 80.7 80.7 1 Beechcraft Super King Air 350 (T) Essendon A 35 1 79.4 79.4 1 Cessna Citation CJ3 (J) Essendon A 35 1 79.1 79.1 1 Partenavia P68 (P) Moorabbin D 35L 1 78.9 78.9 1 Beechcraft Baron (P) Essendon D 35 6 78.5 83.4 1 Diamond DA42 (P) Essendon D 35 1 77.8 77.8 1 Rockwell Super Commander (P) Essendon D 35 11 77.6 89.5 1 Short Term Monitoring Program VIC, Oak Park, April 2013 8 Table 8 Top 10 Most Correlated Aircraft Types Over the Oak Park EMU Aircraft Category: Jet (J), Turboprop (T), Propeller (P), Helicopter (H), Unknown (U) Conclusions Following recommendations made in ‘Review of the Melbourne Environmental Monitoring Units’, Short Term Monitoring was conducted at Oak Park Primary School during the period of 11th August to 8th September 2012. It was determined the most common aircraft movements to traverse the Oak Park community are Essendon Airport movements. Melbourne Airport Runway 34 jet arrivals also fly within proximity of the area. Throughout the reporting period the highest number of correlated aircraft noise events exceeding 60dB(A) in one day was 194. On August 27th, 24 events exceeding 60dB(A) occurred during 2pm and 3pm, this was the greatest number in one hour during the period. Residents in the area of Oak Park were exposed to noise events exceeding 80dB(A) during the hours of day. There were 102 correlated noise events above 60dB(A) that occurred during the hours of night. The average LAmax during the reporting period was 69.1dB(A), with a max level of 94.4dB(A) and minimum level of 55.3dB(A) recorded. Noise events above 60dB(A) were most common in the weekday hours of 10:00am to 4:00pm and on weekends in the periods of 11:00am to 5:00pm. A review of Tables 7 and 8 indicates the most frequent and generally loudest common aircraft types to pass over Oak Park are General Aviation aircraft operating to and from Essendon Airport. The loudest aircraft were generally one off events with only three of the top ten loudest aircraft creating more than one correlated noise event during the reporting period. Three Regular Public Transport (RPT) aircraft types arriving at Melbourne Airport featured in the top ten most frequent correlated aircraft types. The correlation summary is reasonably low for this monitor. This is due to a combination of operations being captured by the edge of the zone and the quieter nature of General Aviation aircraft types. Whilst the noise created by these operations maybe noticeable to the human ear, they do not meet the correlation parameters for the monitor. Due to the distinctive flight patterns and distance from both Melbourne and Essendon Airports, the recorded results are not expected to significantly change due to seasonal variation over a twelve month period. Aircraft Type (Aircraft Category) Airport Operation Type Runway No. Correlated Noise Events LAmax dB(A) Highest No. CNE in One Day Average Maximum Unknown (H) Essendon D HE 245 70.3 89.0 20 Unknown (H) Essendon D 35 201 71.7 88.9 26 Boeing 737-800 (J) Melbourne A 34 193 66.5 84.7 29 Unknown (H) Essendon T HE 184 69.6 89.8 19 Unknown (H) Essendon A HE 149 69.9 86.8 13 Beechcraft Super King Air 200 (T) Essendon D 35 128 67.5 84.8 13 Airbus A320 (J) Melbourne A 34 127 66.8 85.4 17 Boeing 767-300 (J) Melbourne A 34 125 67.0 86.0 12 Aerospatiale AS-332 Super Puma (H) Essendon D HE 64 73.3 82.4 6 Aero Commander 500 (P) Essendon D 35 54 74.2 85.8 5 Short Term Monitoring Program VIC, Oak Park, April 2013 9 Further Information Further information about Airservices noise monitoring program is available on the Airservices website, including reports of the noise and operational data collected by the Noise and Flight Path Monitoring System, as well as fact sheets about topics related to aircraft noise. The website is available at: http://www.airservicesaustralia.com/aircraftnoise/ Contact us To lodge a complaint or make an enquiry about aircraft operations, you can go to WebTrak (www.airservicesaustralia.com/aircraftnoise/webtrak/) use our online form (www.airservicesaustralia.com/aircraftnoise/about-making-a-complaint/) telephone 1800 802 584 (freecall) or 1300 302 240 (local call –Sydney) fax (02) 9556 6641 or write to, Noise Complaints and Information Service, PO Box 211, Mascot NSW 1460. Glossary of Terms A Arrivals AGL Above Ground Level Background noise level (L90) The sound level in dB(A) that is exceeded 90% of the time CNE Correlated noise events - noise events which are matched with aircraft movements CNExx Correlated noise events that are equal or greater than the noise level XX dB(A) D Departures Day 6:00am to 11:00pm EMU Environmental Monitoring Unit H Helicopters Jet Jet aircraft LAeq Continuous equivalent noise level over a time period LAeq 24hr Continuous equivalent noise level over a 24 hour period LAeq night Continuous equivalent noise level over the night time period (hours of 11:00pm to 6:00am) LAmax Maximum sound level in dB(A) Local Operation that departs and arrives at the same airport. Local movements include circuits and training flights. Movement An aircraft operation, such as a take-off or landing Nxx Average daily number of correlated noise events equal to or greater than XX dB(A) Night 11:00pm to 6:00am NFPMS Noise and Flight Path Monitoring System Noise Event A noise that exceeds the threshold sound level for longer than the threshold time that is set Non-Jet Non-jet aircraft O Overflight i.e. an aircraft movement that flew over the area but did not arrive or depart from the airport of concern T Local Operation (Departure & Arrival) Note: For further information on the metrics used in this report refer to Australian Standard 1055.1– 1997 “Acoustics – Description and measurement of environmental noise”. Airservices welcomes comments about this report. Please contact us via e-mail at community.relations@airservicesaustralia.com if you would like to provide feedback.