Assessment ScoreCard – 31 Day

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

22/02/2024 16:55:12

UK Postcode

ISLEWORTH , LONDON , TW7 7FF

Baseline geo-coordinates

51.4669 , -0.324169

Survey type

31 days from the 1st date shown in the Evidence table below .

Assessment band

EXTREMELY HIGH

Assessment actual value

52.40

Assessment description

Sound equates to a busy Motorway i.e. very regular traffic that will be noticeable at peak times which includes evenings and weekends. Location is on a flight path or primary flight corridor and subject to Arrivals and Departures. At times there will be multiple flight occurrences within the same hour, typically between 15 to 20.

Band range

Lower: 30.0 --> Upper: 1000.0

Volumes, Height bands, and Intensity.

For Assessment / Daily Avg. / Hourly Avg.

Count of ALL flights

21,395 / 690.2 / 40.6 ❌ (3,233)

Flights above 26k feet.

454 / 14.6 / 0.9 ✔

Flights between 16k and 26k feet

3,078 / 99.3 / 5.8 ❌ (294)

Flights between 13k and 15k feet

848 / 27.4 / 1.6 ❌ (136)

Flights between 7k and 12k feet

138 / 4.5 / 0.3 ✔

Flights between 6k and 7k feet

18 / 0.6 / 0.0 ✔

Flights between 5k and 6k feet

36 / 1.2 / 0.1 ✔

Flights between 4k and 5k feet

52 / 1.7 / 0.1 ✔

Flights between 3k and 4k feet

39 / 1.3 / 0.1 ✔

Flights below 3k feet

16,732 / 539.7 / 31.7 ❌ (725)

4 or more flights per hour

603 / 19.5 ❌ (209)

9 or more flights per hour

512 / 16.5 ❌ (88)

Departures between 1.5k and 15k feet

7 / 0.2 / 0.0 ✔

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

186 / 6.0

1 AM

105 / 3.4

2 AM

41 / 1.3

3 AM

24 / 0.8

4 AM

66 / 2.1

5 AM

304 / 9.8

6 AM

1,240 / 40.0

7 AM

1,196 / 38.6

8 AM to 9 PM

17,039 / 549.6 / 39.3

10 PM

832 / 26.8

11 PM

334 / 10.8

Other Noise Disturbance, Vibration and Emissions factors

Time in seconds an aircraft existed in the airspace bubble

30 ❌ (21)

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

50 ❌ (43)

Minimum avg. distance in miles

0.39

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

672.0 / 334.0 / 35.4 ❌ (77)

Flight holding stack identified?

No

Altitude for all flights

4,998 ❌ (15,762)

Altitude of departures between 1.5k and 15k feet

9,387 ✔

Altitude of flights below 20k feet

4,311 ❌ (7,846)

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

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

66.40

Wednesday @ 11:00 - 4 time(s) in 4 weeks. Approx:45 flight events.

64.90

Wednesday @ 13:00 - 4 time(s) in 4 weeks. Approx:43 flight events.

64.20

Wednesday @ 18:00 - 4 time(s) in 4 weeks. Approx:43 flight events.

62.10

Wednesday @ 15:00 - 4 time(s) in 4 weeks. Approx:41 flight events.

61.60

Friday @ 15:00 - 4 time(s) in 4 weeks. Approx:41 flight events.

61.30

Wednesday @ 12:00 - 4 time(s) in 4 weeks. Approx:41 flight events.

61.20

Friday @ 8:00 - 4 time(s) in 4 weeks. Approx:39 flight events.

60.10

Friday @ 11:00 - 4 time(s) in 4 weeks. Approx:39 flight events.

59.80

Friday @ 6:00 - 4 time(s) in 4 weeks. Approx:38 flight events.