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

08/06/2025 18:36:05

UK Postcode

CHISLEHURST-WEST-5DX-0824 , LONDON , BR7 5NG

Baseline geo-coordinates

51.4081 , 0.061269

Survey type

31 days prior to: 31-Aug-2024 @22:06:45

Assessment band

FREQUENT

Assessment actual value

15.00

Assessment description

Likely to encounter both night-time and day-time noise disturbances that are caused by high volumes of planes flying at at low altitude. Also expect a visual impact too.

Band range

Lower: 12.0 --> Upper: 16.0

Volumes, Height bands, and Intensity.

For Assessment / Daily Avg. / Hourly Avg.

Count of ALL flights

5,177 / 167.0 / 9.8 ❌ (3,218)

Flights above 26k feet.

953 / 30.7 / 1.8 ❌ (754)

Flights between 16k and 26k feet

171 / 5.5 / 0.3 ✔

Flights between 13k and 15k feet

196 / 6.3 / 0.4 ❌ (179)

Flights between 7k and 12k feet

2,391 / 77.1 / 4.5 ❌ (547)

Flights between 6k and 7k feet

436 / 14.1 / 0.8 ❌ (155)

Flights between 5k and 6k feet

826 / 26.6 / 1.6 ❌ (227)

Flights between 4k and 5k feet

145 / 4.7 / 0.3 ✔

Flights between 3k and 4k feet

3 / 0.1 / 0.0 ✔

Flights below 3k feet

56 / 1.8 / 0.1 ✔

4 or more flights per hour

449 / 14.5 ❌ (206)

9 or more flights per hour

214 / 6.9 ❌ (78)

Departures between 1.5k and 15k feet

372 / 12.0 / 0.7 ✔

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

Between Midnight and 1am

27 / 0.9

Between 1am and 2am

24 / 0.8

Between 2am and 3am

12 / 0.4

Between 3am and 4am

19 / 0.6

Between 4am and 5am

41 / 1.3

Between 5am and 6am

116 / 3.7

Between 6am and 7am

297 / 9.6

Between 7am and 8am

282 / 9.1

Between 8am and 9pm

4,115 / 132.7 / 9.5

Between 10pm and 11pm

132 / 4.3

Between 11pm and Midnight

49 / 1.6

Other Noise Disturbance, Vibration and Emissions factors

Avg time in seconds an aircraft remained in the airspace bubble

33 ❌ (30)

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

46 ❌ (43)

Minimum avg. distance in miles

0.47

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

131.0 / 59.0 / 6.9 ❌ (69)

Flight holding stack identified?

Yes ❌

Altitude for all flights

13,756 ❌ (17,462)

Altitude of departures between 1.5k and 15k feet

9,344 ✔

Altitude of flights below 20k feet

8,905 ✔

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

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

22.00

Saturdays between 13:00 and 14:00 - 4 time(s) in 4 weeks. Approx:15 flight events.

20.00

Thursdays between 10:00 and 11:00 - 4 time(s) in 4 weeks. Approx:12 flight events.

18.20

Wednesdays between 10:00 and 11:00 - 4 time(s) in 4 weeks. Approx:11 flight events.

17.50

Fridays between 6:00 and 7:00- 4 time(s) in 4 weeks. Approx:11 flight events.

17.20

Fridays between 12:00 and 13:00 - 4 time(s) in 4 weeks. Approx:12 flight events.

16.60

Saturdays between 9:00 and 10:00- 4 time(s) in 4 weeks. Approx:10 flight events.

16.40

Saturdays between 14:00 and 15:00 - 4 time(s) in 4 weeks. Approx:11 flight events.

16.30

Thursdays between 12:00 and 13:00 - 4 time(s) in 4 weeks. Approx:11 flight events.

15.90

Thursdays between 6:00 and 7:00- 4 time(s) in 4 weeks. Approx:10 flight events.