Assessment ScoreCard – 31 Day

Assessment Scorecard headlines

All Assessments are based on an ambient background noise of between 30 and 40 dBs i.e. a quiet residential area. Typically the noise from an overflying aircraft is between 50-65 dBs. If your property is located near to a busy road i.e. 70-75 dBs, the noise impact from aircraft will be significantly reduced, whilst the road remains busy.

Note: Overflying aircraft noise typically has a duration of 30-50 seconds, the higher the plane the longer the duration. Whereas the average car, bus or HGV the duration is only a few seconds.

Date of survey

29/09/2025 10:13:22

UK Postcode Area

SYDENHAM, LONDON, SE26 5QE

Baseline geo-coordinates

51.4254 , -0.050899

Survey type

31 days prior to: 29-Sep-2025 @01:20:21

Assessment band

REGULAR

Assessment actual value

10.47

Assessment description

Will encounter some 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: 7.0 --> Upper: 12.0

Volumes, Height bands, and Intensity.

For Assessment / Daily Avg. / Hourly Avg.

Count of ALL flights

3,373 / 108.8 / 6.4 ❌ (3,187)

Flights above 26k feet.

944 / 30.5 / 1.8 ❌ (760)

Flights between 16k and 26k feet

317 / 10.2 / 0.6 ✔

Flights between 13k and 15k feet

90 / 2.9 / 0.2 ✔

Flights between 7k and 12k feet

350 / 11.3 / 0.7 ✔

Flights between 6k and 7k feet

233 / 7.5 / 0.4 ❌ (165)

Flights between 5k and 6k feet

820 / 26.5 / 1.6 ❌ (224)

Flights between 4k and 5k feet

560 / 18.1 / 1.1 ❌ (255)

Flights between 3k and 4k feet

28 / 0.9 / 0.1 ✔

Flights below 3k feet

31 / 1.0 / 0.1 ✔

4 or more flights per hour

317 / 10.2 ❌ (206)

9 or more flights per hour

42 / 1.4 ✔

Departures between 1.5k and 15k feet

498 / 16.1 / 0.9 ❌ (399)

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

Between Midnight and 1am

23 / 0.7

Between 1am and 2am

13 / 0.4

Between 2am and 3am

13 / 0.4

Between 3am and 4am

17 / 0.5

Between 4am and 5am

43 / 1.4

Between 5am and 6am

69 / 2.2

Between 6am and 7am

132 / 4.3

Between 7am and 8am

197 / 6.4

Between 8am and 9pm

2,583 / 83.3 / 6.0

Between 10pm and 11pm

150 / 4.8

Between 11pm and Midnight

66 / 2.1

Other Noise Disturbance, Vibration and Emissions factors

Avg time in seconds an aircraft remained in the airspace bubble

24 ✔

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

56 ❌ (43)

Minimum avg. distance in miles

0.47

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

70.0 / 39.0 / 3.7 ❌ (67)

Flight holding stack identified?

No

Altitude for all flights

15,417 ❌ (17,615)

Altitude of departures between 1.5k and 15k feet

8,672 ✔

Altitude of flights below 20k feet

7,273 ❌ (8,784)

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

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

14.50

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

13.00

Sundays between 8:00 and 9:00- 4 time(s) in 4 weeks. Approx:7 flight events.

11.80

Saturdays between 17:00 and 18:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

10.70

Saturdays between 10:00 and 11:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.60

Sundays between 10:00 and 11:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.30

Saturdays between 13:00 and 14:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.10

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

9.80

Sundays between 7:00 and 8:00- 4 time(s) in 4 weeks. Approx:6 flight events.