Assessment ScoreCard – 31 Day

Aircraft Traffic Assessment: 31 Day 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

05/02/2025 11:57:49

UK Postcode

HENFIELD , WEST SUSSEX , BN5 9EQ

Baseline geo-coordinates

50.931 , -0.272263

Survey type

31 days prior to: 01-Sep-2024 @00:07:41

Assessment band

REGULAR

Assessment actual value

10.36

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

3,693 / 119.1 / 7.0 (3,156)

Flights above 26k feet.

698 / 22.5 / 1.3

Flights between 16k and 26k feet

504 / 16.3 / 1.0 (354)

Flights between 13k and 15k feet

128 / 4.1 / 0.2

Flights between 7k and 12k feet

2,243 / 72.4 / 4.3 (539)

Flights between 6k and 7k feet

29 / 0.9 / 0.1

Flights between 5k and 6k feet

1 / 0.0 / 0.0

Flights between 4k and 5k feet

0

Flights between 3k and 4k feet

2 / 0.1 / 0.0

Flights below 3k feet

88 / 2.8 / 0.2

4 or more flights per hour

348 / 11.2 (201)

9 or more flights per hour

105 / 3.4 (75)

Departures between 1.5k and 15k feet

192 / 6.2 / 0.4

Time and Sleep Analysis

For Assessment / Daily Avg. / Hourly Avg.

Between Midnight and 1am

52 / 1.7

Between 1am and 2am

14 / 0.5

Between 2am and 3am

9 / 0.3

Between 3am and 4am

15 / 0.5

Between 4am and 5am

12 / 0.4

Between 5am and 6am

28 / 0.9

Between 6am and 7am

135 / 4.4

Between 7am and 8am

262 / 8.5

Between 8am and 9pm

2,908 / 93.8 / 6.7

Between 10pm and 11pm

118 / 3.8

Between 11pm and Midnight

120 / 3.9

Other Noise Disturbance, Vibration and Emissions factors

Avg time in seconds an aircraft remained in the airspace bubble

95 (31)

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

47 (43)

Minimum avg. distance in miles

0.45

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

86.0 / 41.0 / 4.5 (67)

Flight holding stack identified?

Yes

Altitude for all flights

15,611 (17,559)

Altitude of departures between 1.5k and 15k feet

12,323

Altitude of flights below 20k feet

10,598

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

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

13.10

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

12.10

Saturdays between 9:00 and 10:00- 4 time(s) in 4 weeks. Approx:8 flight events.

11.70

Thursdays between 13:00 and 14:00 - 4 time(s) in 4 weeks. Approx:9 flight events.

11.50

Saturdays between 12:00 and 13:00 - 4 time(s) in 4 weeks. Approx:8 flight events.

10.30

Thursdays between 16:00 and 17:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

9.90

Saturdays between 14:00 and 15:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

9.70

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



Evidence by associated Airport – indicative only: HENFIELD

UK Airport Count of Flights Percentage of Total
LONDON GATWICK AIRPORT229662.2
LONDON HEATHROW AIRPORT52714.3
TRANSATLANTIC FLIGHT?38910.5
MANCHESTER AIRPORT681.8
BRISTOL AIRPORT631.7
LONDON LUTON AIRPORT631.7
LONDON STANSTED AIRPORT561.5
MINOR UK AIRPORT?541.5
BIRMINGHAM INTERNATIONAL AIRPORT521.4