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

15/09/2022 16:50:58

UK Postcode

SIDCUP-WEST-MELVILLE , LONDON , DA14 4LU

Baseline geo-coordinates

51.4332 , 0.117086

Survey type

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

Assessment band

FREQUENT

Assessment actual value

15.44

Assessment description

Sound equates to an "A" road or a busy "B" road i.e. regular traffic that will be noticeable at peak times which includes evenings and weekends. Location is on a primary 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 between 4-10. Some of the flights will be below 7000 feet.

Band range

Lower: 12.0 --> Upper: 16.0

Volumes, Height bands, and Intensity.

For Assessment / Daily Avg. / Hourly Avg.

Count of ALL flights

3,185 / 102.7 / 6.0 ❌ (3,131)

Flights above 26k feet.

577 / 18.6 / 1.1 ✔

Flights between 16k and 26k feet

111 / 3.6 / 0.2 ✔

Flights between 13k and 15k feet

85 / 2.7 / 0.2 ✔

Flights between 7k and 12k feet

166 / 5.4 / 0.3 ✔

Flights between 6k and 7k feet

59 / 1.9 / 0.1 ✔

Flights between 5k and 6k feet

33 / 1.1 / 0.1 ✔

Flights between 4k and 5k feet

4 / 0.1 / 0.0 ✔

Flights between 3k and 4k feet

53 / 1.7 / 0.1 ✔

Flights below 3k feet

2,097 / 67.6 / 4.0 ❌ (666)

4 or more flights per hour

285 / 9.2 ❌ (214)

9 or more flights per hour

101 / 3.3 ❌ (90)

Departures between 1.5k and 15k feet

228 / 7.4 / 0.4 ✔

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

17 / 0.5

1 AM

12 / 0.4

2 AM

9 / 0.3

3 AM

13 / 0.4

4 AM

12 / 0.4

5 AM

24 / 0.8

6 AM

87 / 2.8

7 AM

190 / 6.1

8 AM to 9 PM

2,704 / 87.2 / 6.2

10 PM

60 / 1.9

11 PM

16 / 0.5

Other Noise Disturbance, Vibration and Emissions factors

Time in seconds an aircraft existed in the airspace bubble

25 ❌ (22)

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

38 ✔

Minimum avg. distance in miles

0.31

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

81.0 / 31.0 / 4.3 ❌ (72)

Flight holding stack identified?

No

Altitude for all flights

9,610 ❌ (15,884)

Altitude of departures between 1.5k and 15k feet

10,256 ✔

Altitude of flights below 20k feet

3,793 ❌ (8,037)

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

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

15.10

Tuesday @ 19:00 - 4 time(s) in 4 weeks. Approx:9 flight events.

14.70

Tuesday @ 16:00 - 4 time(s) in 4 weeks. Approx:8 flight events.

14.10

Tuesday @ 15:00 - 4 time(s) in 4 weeks. Approx:8 flight events.

13.80

Wednesday @ 13:00 - 4 time(s) in 4 weeks. Approx:8 flight events.

12.20

Wednesday @ 19:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

11.80

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

11.60

Thursday @ 8:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

11.10

Tuesday @ 14:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.50

Wednesday @ 16:00 - 4 time(s) in 4 weeks. Approx:6 flight events.