Assessment ScoreCard – Full

Aircraft Traffic Assessment: Full Scorecard



The symbol indicates the measure is better than the average when compared with other assessed
UK postcodes. The ❌ represents the opposite. Assessed averages are shown in brackets.

See: for a full explanation about the Assessment scorecard.

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

04/09/2022 07:17:14

UK Postcode

SIDCUP-WEST-MELVILLE , LONDON , DA14 4LU

Baseline geo-coordinates

51.4332 , 0.117086

Survey type

Full. Based on 93 days in 2019, during Mid Dec to Mid Jan, whole of April and August.

Assessment band

REGULAR

Assessment actual value

11.89

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

6,051 / 65.1 / 3.8

Flights above 26k feet.

1,241 / 13.3 / 0.8

Flights between 16k and 26k feet

256 / 2.8 / 0.2

Flights between 13k and 15k feet

206 / 2.2 / 0.1

Flights between 7k and 12k feet

477 / 5.1 / 0.3

Flights between 6k and 7k feet

263 / 2.8 / 0.2

Flights between 5k and 6k feet

298 / 3.2 / 0.2

Flights between 4k and 5k feet

55 / 0.6 / 0.0

Flights between 3k and 4k feet

349 / 3.8 / 0.2

Flights below 3k feet

2,906 / 31.2 / 1.8 (1,022)

4 or more flights per hour

499 / 5.4 (419)

9 or more flights per hour

97 / 1.0

Departures between 1.5k and 15k feet

547 / 5.9 / 0.3

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

0 AM

21 / 0.2

1 AM

18 / 0.2

2 AM

19 / 0.2

3 AM

24 / 0.3

4 AM

25 / 0.3

5 AM

88 / 0.9

6 AM

306 / 3.3

7 AM

375 / 4.0

8 AM to 9 PM

4,957 / 53.3 / 3.8

10 PM

107 / 1.2

11 PM

47 / 0.5

Other Noise Disturbance, Vibration and Emissions factors

Time in seconds an aircraft existed in the airspace bubble

24 (18)

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

35

Minimum avg. distance in miles

0.35

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

46.0 / 16.0 / 2.4

Flight holding stack identified?

No

Altitude for all flights

11,088 (19,223)

Altitude of departures between 1.5k and 15k feet

10,347

Altitude of flights below 20k feet

4,743 (9,219)

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

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

11.12

Monday @ 18:00 - 13 time(s) in 13 weeks. Approx:6 flight events.

9.25

Tuesday @ 18:00 - 12 time(s) in 13 weeks. Approx:5 flight events.

8.79

Tuesday @ 12:00 - 12 time(s) in 13 weeks. Approx:5 flight events.

7.58

Monday @ 14:00 - 12 time(s) in 13 weeks. Approx:4 flight events.

7.33

Monday @ 9:00 - 12 time(s) in 13 weeks. Approx:5 flight events.

8.00

Monday @ 10:00 - 11 time(s) in 13 weeks. Approx:5 flight events.

7.86

Monday @ 12:00 - 11 time(s) in 13 weeks. Approx:5 flight events.

7.23

Friday @ 13:00 - 11 time(s) in 13 weeks. Approx:4 flight events.

6.82

Monday @ 8:00 - 11 time(s) in 13 weeks. Approx:4 flight events.

Our scorecard is designed to provide a greater understanding how the assessment was reached for your selected UK post code. To enable you to validate our assessment we also provide up to 10 occurrences when we believe the disruption will be at its highest.

For those that would like to perform their own analysis we can also provide the low level flight data that includes the length of time a plane existed inside your select airspace bubble.