Assessment ScoreCard – 31 Day

Aircraft Traffic Assessment: 31 Day Scorecard



The symbol indicates the measure is better than the average when compared with other assessed
UK postcodes. The ❌ represents the opposite. Assessed averages are shown in brackets.

See: for a full explanation about the Assessment scorecard.

Assessment Scorecard headlines

All Assessments are based on an ambient background noise of 40 decibels i.e. a quiet residential area. If your property is located near to a busy road i.e. 70-75 decibels, the noise impact from aircraft will be significantly reduced, whilst the road remains busy.

Note: Airborne aircraft noise is typically in the range of 45dB - 65dB for heights below 26,000 feet and for a duration of 30-50 seconds. Whereas the average car, bus or HGV the duration is only a few seconds.

Date of survey

28/10/2020 16:26:57

UK Postcode

COBHAM , SURREY , KT11 3DY

Baseline geo-coordinates

51.3288 , -0.410952

Survey type

31 Day. Based on the 31 days prior to the survey date shown above.

Assessment band

REGULAR

Assessment actual value

10.92

Assessment description

Sound equates to a "B" road or busy "C" road i.e. regular traffic that will be noticeable at peak times which includes evenings and weekends. Location is on a secondary flight corridor or flight route or in a flight holding stack area. At times there will be multiple flight occurrences within the same hour, typically 4. Some of the flights will be below 7000 feet.

Band range

Lower: 7.0 --> Upper: 12.0

Volumes, Height bands, and Intensity.

For Assessment / Daily Avg. / Hourly Avg.

Count of ALL flights

3,074 / 99.2 / 5.8 (1,128)

Flights above 26k feet.

155 / 5.0 / 0.3

Flights between 16k and 26k feet

690 / 22.3 / 1.3 (113)

Flights between 13k and 15k feet

139 / 4.5 / 0.3 (48)

Flights between 7k and 12k feet

1,343 / 43.3 / 2.5 (157)

Flights between 6k and 7k feet

418 / 13.5 / 0.8 (62)

Flights between 5k and 6k feet

292 / 9.4 / 0.6 (88)

Flights between 4k and 5k feet

21 / 0.7 / 0.0

Flights between 3k and 4k feet

1 / 0.0 / 0.0

Flights below 3k feet

15 / 0.5 / 0.0

4 or more flights per hour

374 / 12.1 (78)

9 or more flights per hour

78 / 2.5 (23)

Departures between 1.5k and 15k feet

1,043 / 33.6 / 2.0 (163)

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

13 / 0.4

1 AM

3 / 0.1

2 AM

2 / 0.1

3 AM

3 / 0.1

4 AM

11 / 0.4

5 AM

46 / 1.5

6 AM

94 / 3.0

7 AM

132 / 4.3

8 AM to 9 PM

2,556 / 82.5 / 5.9

10 PM

134 / 4.3

11 PM

68 / 2.2

Other Noise Disturbance, Vibration and Emissions factors

Time in seconds an aircraft existed in the airspace bubble

17

Percentage of overflying occuring Out-Of-Hours and at Weekends

46 (41)

Minimum avg. distance in miles

0.69

Number of possible disruptions by; day / out-of-hours / hour

89.0 / 41.0 / 4.7 (25)

Flight holding stack identified?

No

Altitude for all flights

11,689 (16,161)

Altitude of departures between 1.5k and 15k feet

7,516 (7,830)

Altitude of flights below 20k feet

10,337

Busiest times of day
(Distruption: 0 - low, 25+ high)

Day of week, time, frequency and number of flight events.

15.50

Monday @ 13:00 - 4 time(s) in 4 weeks. Approx:10 flight events.

11.70

Monday @ 9:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

11.60

Wednesday @ 9:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

11.50

Monday @ 15:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

9.80

Tuesday @ 12:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

9.70

Monday @ 11:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

9.20

Monday @ 21:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

9.10

Tuesday @ 9:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

Our scorecard is designed to provide a greater understanding how the assessment was reached for your selected UK post code. To enable you to validate our assessment we also provide up to 10 occurrences when we believe the disruption will be at its highest.

For those that would like to perform their own analysis we can also provide the low level flight data that includes the length of time a plane existed inside your select airspace bubble.



Flights by Airport (less than 1% are excluded): COBHAM KT11 3DY (SURREY)

UK Airport Count of Flights Percentage of Total
LONDON HEATHROW AIRPORT49990.2
LONDON STANSTED AIRPORT183.3
LONDON LUTON AIRPORT71.3

Flight evidence for location: ()

Event_date_time Event_date_time_hidden Call Sign ICAO24 UK Airport Direction Altitude (feet) Distance (miles) Airspace (seconds)
Event_date_time Event_date_time_hidden Call Sign ICAO24 Airport Direction Altitude (feet) Distance (miles) Airspace (seconds)