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

18/11/2025 11:23:27

UK Postcode Area

SYDENHAM, LONDON, SE26 5QE

Baseline geo-coordinates

51.4254 , -0.050899

Survey type

31 days prior to: 18-Nov-2025 @00:29:26

Assessment band

REGULAR

Assessment actual value

10.01

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

2,897 / 93.5 / 5.5 ✔

Flights above 26k feet.

706 / 22.8 / 1.3 ✔

Flights between 16k and 26k feet

265 / 8.5 / 0.5 ✔

Flights between 13k and 15k feet

81 / 2.6 / 0.2 ✔

Flights between 7k and 12k feet

298 / 9.6 / 0.6 ✔

Flights between 6k and 7k feet

493 / 15.9 / 0.9 ❌ (172)

Flights between 5k and 6k feet

652 / 21.0 / 1.2 ❌ (230)

Flights between 4k and 5k feet

365 / 11.8 / 0.7 ❌ (250)

Flights between 3k and 4k feet

10 / 0.3 / 0.0 ✔

Flights below 3k feet

27 / 0.9 / 0.1 ✔

4 or more flights per hour

284 / 9.2 ❌ (208)

9 or more flights per hour

37 / 1.2 ✔

Departures between 1.5k and 15k feet

459 / 14.8 / 0.9 ❌ (400)

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

Between Midnight and 1am

13 / 0.4

Between 1am and 2am

10 / 0.3

Between 2am and 3am

4 / 0.1

Between 3am and 4am

15 / 0.5

Between 4am and 5am

27 / 0.9

Between 5am and 6am

72 / 2.3

Between 6am and 7am

134 / 4.3

Between 7am and 8am

194 / 6.3

Between 8am and 9pm

2,281 / 73.6 / 5.3

Between 10pm and 11pm

67 / 2.2

Between 11pm and Midnight

23 / 0.7

Other Noise Disturbance, Vibration and Emissions factors

Avg time in seconds an aircraft remained in the airspace bubble

21 ✔

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

53 ❌ (44)

Minimum avg. distance in miles

0.48

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

65.0 / 35.0 / 3.4 ✔

Flight holding stack identified?

No

Altitude for all flights

14,471 ❌ (17,593)

Altitude of departures between 1.5k and 15k feet

8,767 ✔

Altitude of flights below 20k feet

7,458 ❌ (8,782)

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

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

11.80

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

11.50

Mondays between 20:00 and 21:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.80

Saturdays between 19:00 and 20:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.60

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

10.30

Sundays between 9:00 and 10:00- 4 time(s) in 4 weeks. Approx:6 flight events.

9.90

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

9.60

Saturdays between 8:00 and 9:00- 4 time(s) in 4 weeks. Approx:5 flight events.

9.20

Saturdays between 16:00 and 17:00 - 4 time(s) in 4 weeks. Approx:5 flight events.