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

07/04/2024 16:47:37

UK Postcode

CHISLEHURST-STATION , LONDON , BR7 5RF

Baseline geo-coordinates

51.4053 , 0.062236

Survey type

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

Assessment band

REGULAR

Assessment actual value

11.04

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

3,218 / 103.8 / 6.1 ✔

Flights above 26k feet.

664 / 21.4 / 1.3 ❌ (623)

Flights between 16k and 26k feet

138 / 4.5 / 0.3 ✔

Flights between 13k and 15k feet

89 / 2.9 / 0.2 ✔

Flights between 7k and 12k feet

1,330 / 42.9 / 2.5 ❌ (427)

Flights between 6k and 7k feet

335 / 10.8 / 0.6 ❌ (188)

Flights between 5k and 6k feet

470 / 15.2 / 0.9 ❌ (299)

Flights between 4k and 5k feet

102 / 3.3 / 0.2 ✔

Flights between 3k and 4k feet

5 / 0.2 / 0.0 ✔

Flights below 3k feet

85 / 2.7 / 0.2 ✔

4 or more flights per hour

298 / 9.6 ❌ (210)

9 or more flights per hour

78 / 2.5 ✔

Departures between 1.5k and 15k feet

316 / 10.2 / 0.6 ✔

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

11 / 0.4

1 AM

15 / 0.5

2 AM

8 / 0.3

3 AM

8 / 0.3

4 AM

19 / 0.6

5 AM

97 / 3.1

6 AM

208 / 6.7

7 AM

254 / 8.2

8 AM to 9 PM

2,441 / 78.7 / 5.6

10 PM

79 / 2.5

11 PM

47 / 1.5

Other Noise Disturbance, Vibration and Emissions factors

Time in seconds an aircraft existed in the airspace bubble

20 ✔

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

48 ❌ (42)

Minimum avg. distance in miles

0.44

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

77.0 / 37.0 / 4.1 ✔

Flight holding stack identified?

Yes ❌

Altitude for all flights

13,854 ❌ (15,786)

Altitude of departures between 1.5k and 15k feet

9,702 ✔

Altitude of flights below 20k feet

8,369 ✔

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

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

14.50

Wednesday @ 10:00 - 4 time(s) in 4 weeks. Approx:9 flight events.

11.00

Wednesday @ 11:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

10.10

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

9.70

Thursday @ 10:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

9.60

Wednesday @ 15:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

9.00

Wednesday @ 9:00 - 4 time(s) in 4 weeks. Approx:5 flight events.

8.90

Thursday @ 15:00 - 4 time(s) in 4 weeks. Approx:5 flight events.

8.80

Friday @ 7:00 - 4 time(s) in 4 weeks. Approx:6 flight events.