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

23/12/2021 09:35:13

UK Postcode

CHISLEHURST , LONDON , BR7 6EN

Baseline geo-coordinates

51.4245 , 0.056616

Survey type

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

Assessment band

REGULAR

Assessment actual value

7.78

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

1,439 / 46.4 / 2.7 ✔

Flights above 26k feet.

435 / 14.0 / 0.8 ✔

Flights between 16k and 26k feet

89 / 2.9 / 0.2 ✔

Flights between 13k and 15k feet

32 / 1.0 / 0.1 ✔

Flights between 7k and 12k feet

143 / 4.6 / 0.3 ✔

Flights between 6k and 7k feet

172 / 5.5 / 0.3 ✔

Flights between 5k and 6k feet

316 / 10.2 / 0.6 ❌ (280)

Flights between 4k and 5k feet

86 / 2.8 / 0.2 ✔

Flights between 3k and 4k feet

10 / 0.3 / 0.0 ✔

Flights below 3k feet

156 / 5.0 / 0.3 ✔

4 or more flights per hour

90 / 2.9 ✔

9 or more flights per hour

8 / 0.3 ✔

Departures between 1.5k and 15k feet

154 / 5.0 / 0.3 ✔

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

3 / 0.1

1 AM

8 / 0.3

2 AM

10 / 0.3

3 AM

9 / 0.3

4 AM

8 / 0.3

5 AM

31 / 1.0

6 AM

122 / 3.9

7 AM

129 / 4.2

8 AM to 9 PM

1,042 / 33.6 / 2.4

10 PM

27 / 0.9

11 PM

10 / 0.3

Other Noise Disturbance, Vibration and Emissions factors

Time in seconds an aircraft existed in the airspace bubble

18 ✔

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

38 ✔

Minimum avg. distance in miles

0.51

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

27.0 / 10.0 / 1.4 ✔

Flight holding stack identified?

No

Altitude for all flights

15,707 ❌ (16,202)

Altitude of departures between 1.5k and 15k feet

9,543 ✔

Altitude of flights below 20k feet

6,706 ❌ (8,007)

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

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

8.30

Wednesday @ 18:00 - 4 time(s) in 4 weeks. Approx:5 flight events.

5.40

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

12.25

Tuesday @ 18:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

8.88

Wednesday @ 8:00 - 4 time(s) in 4 weeks. Approx:5 flight events.

6.75

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

6.25

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

6.13

Wednesday @ 14:00 - 4 time(s) in 4 weeks. Approx:4 flight events.

4.88

Monday @ 18:00 - 4 time(s) in 4 weeks. Approx:3 flight events.

4.63

Tuesday @ 7:00 - 4 time(s) in 4 weeks. Approx:3 flight events.