Making sense of the Aircraft Traffic Assessment Scorecard.

This article explains how to make sense of the information contained within the Aircraft Traffic Assessment Scorecard, both for the Full and 31 Day assessments.

Date of SurveyFor the 31 Day Scorecard the date represents the end date and time for the survey. The start date and time is calculated 31 days earlier.

Whereas for the Full Scorecard the date represents when the survey was requested and is for information only.
LocationIs the identifier for the location being surveyed.
Baseline geo-coordinatesThe geo-coordinates are used to define the centre of the 1 mile airspace bubble. Typically this is the actual location of the point-of-interest.
Survey TypeDescribes the type of assessment survey being reported. The full survey analyses 93 days of flight events based on 2019. The 31 Day survey uses the actual survey date, see above.
Assessment disruption bandThe Assessment band category e.g. FREQUENT, OCCASIONAL, VERY HIGH etc. This is an important measure.
Assessment disruption valueThe actual Assessment value. Useful for gaining an understanding where the location sits within the disruption band i.e. bottom, middle or top. This is an important measure.
Assessment descriptionA description that attempts to relate the Assessment to an equivalent road noise.
Band range.Shows the lower and upper levels for the Assessment band. Designed to be used in conjunction with the Assessment disruption value. This is important data.
All flights below 26,000 feetThe total number of flights that occurred below 26,000 feet within the assessment period. Flights below 26,000 feet can clearly be heard from the ground. Flights at this height are someway from the airport.
Flights below 20,000 feetThe total number of flights that occurred below 20,000 feet within the assessment period. Flights below 20,000 feet can clearly be heard from the ground. Flights at this height are someway from the airport.
Flights between 7,000 and 12,000 feetThe total number of flights that occurred between 7,000 and 12,000 feet within the assessment period. Flights below 12,000 feet can clearly be heard from the ground and have recently Departed or preparing for Arrival.
Flights below 7000 feetThe total number of flights that occurred at 7,000 within the assessment period. Flights below 7,000 feet can clearly be heard from the ground and have recently Departed or prepared for Arrival.
4 or more flights per hourThe count of occurrences where 4 or more flights occurred within a single 60 minute period. For a flight to qualify it has to be below 26,000 feet. 4 flights within 60 minutes averages a flight every 15 minutes.
9 or more flights per hourThe count of occurrences where 9 or more flights occurred within a single 60 minute period. For a flight to qualify it has to be below 26,000 feet. 9 flights within 60 minutes averages a flight every 7 minutes.
Departures between 1,500 and 15,000
feet
The total number of Departures between 1,500 and 15,000 feet within the assessment period. Departures tend to be noisier than Arrivals.
Time in seconds an aircraft existed in the
Airspace Bubble
The average time in seconds it takes for a flight to travel through your airspace bubble which as a radius of 1 mile. The longer the period the greater will be the level of disruption.
Altitude for all flightsThe average altitude for all flights passing through the area.
Altitude of departures between 1,500 and
15,000 feet
The average altitude for Departing flights that are between 1,500 and 15,000 feet.
Altitude of flights below 20,000 feetThe average altitude for all flights passing through the area that are below 20,000 feet.
Number of disruptions per dayThe average daily number of disruptions to expect. Note: please see our article about how the disruption is calculated. This is an important measure.
Percentage of disruptions that occur
Out-Of-Hours and at Weekends
The percentage of disruptions that occur at weekends and/or after hours.
Distance from baseline in milesThe average distance the disruptive flight was from the baseline co-ordinates, in fractions of a mile
Flight holding stack identified?If a fight holding stack is identified the returned value is ‘YES’. Meaning planes will be held in a loop at between 7000-12000 feet. Multiple planes can exist in the stack at the same time.
Scale of regular disruption / Period and
Frequency.
To help you validate the Assessment via an actual visit, the scorecard includes a list of 10 days and associated times when the disruptions are most likely to occur.

Our personal Airspace bubble

Each of us live inside our own personal Airspace bubble but how do we know what’s going on in that bubble and whether or not that activity could disturb the quality of our lives?

In the context of this article an Airspace bubble is a 1 mile radius from a specified point such as our home, holiday location or outdoor leisure space.

This article focuses on the impact and assessment of commercial Aircraft within our personal Airspace bubbles. Firstly, we need to understand the terms such as impact and assessment before interpreting any results. Our Assessment ignores all aircraft above 26,000 feet as above this height the noise, and possible pollution, is less likely to disturb our lives. Likewise, we also ignore aircraft that share our bubble for less that 7.5 seconds as it implies any noise would not be around long enough to create a significant disturbance.

Experience has told us that real disruption is not caused by individual aircraft operating within our Airspace bubble but it’s actually the repetitive nature of multiple aircraft at regular times that has the biggest impact.

To summarise our assessment of disturbance is based on all flights that regularly share our Airspace at the same time for periods greater than 7.5 seconds and are below 26,000 feet. Therefore, our assessment could say for a location; between 8pm and 11pm on a Friday, Saturday and Sunday there is an 80% chance you will hear and/or see aircraft within a 10-15 minute period. The disturbance classification for this location, across all time periods, is: Frequent“.

Having an understanding of the facts you can now make a personally decision about whether this situation meets your life style criteria.

We all have the right to know and to make informed decisions.