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 days prior to: 15-Sep-2022 @16:56:37

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 ❌ (3,153)

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 ❌ (596)

4 or more flights per hour

285 / 9.2 ❌ (201)

9 or more flights per hour

101 / 3.3 ❌ (74)

Departures between 1.5k and 15k feet

228 / 7.4 / 0.4 ✔

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

Between Midnight and 1am

17 / 0.5

Between 1am and 2am

12 / 0.4

Between 2am and 3am

9 / 0.3

Between 3am and 4am

13 / 0.4

Between 4am and 5am

12 / 0.4

Between 5am and 6am

24 / 0.8

Between 6am and 7am

87 / 2.8

Between 7am and 8am

190 / 6.1

Between 8am and 9pm

2,704 / 87.2 / 6.2

Between 10pm and 11pm

60 / 1.9

Between 11pm and Midnight

16 / 0.5

Other Noise Disturbance, Vibration and Emissions factors

Avg time in seconds an aircraft remained in the airspace bubble

25 ✔

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 ❌ (67)

Flight holding stack identified?

No

Altitude for all flights

9,610 ❌ (17,557)

Altitude of departures between 1.5k and 15k feet

10,256 ✔

Altitude of flights below 20k feet

3,793 ❌ (8,825)

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

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

15.10

Tuesdays between 19:00 and 20:00 - 4 time(s) in 4 weeks. Approx:9 flight events.

14.70

Tuesdays between 16:00 and 17:00 - 4 time(s) in 4 weeks. Approx:8 flight events.

14.10

Tuesdays between 15:00 and 16:00 - 4 time(s) in 4 weeks. Approx:8 flight events.

13.80

Wednesdays between 13:00 and 14:00 - 4 time(s) in 4 weeks. Approx:8 flight events.

12.20

Wednesdays between 19:00 and 20:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

11.80

Wednesdays between 11:00 and 12:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

11.60

Thursdays between 8:00 and 9:00- 4 time(s) in 4 weeks. Approx:6 flight events.

11.10

Tuesdays between 14:00 and 15:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.50

Wednesdays between 16:00 and 17:00 - 4 time(s) in 4 weeks. Approx:6 flight events.