Assessment ScoreCard – 31 Day

Summary Overview

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

26/11/2020 10:34:52

Location

CHATSWORTH , SIMI VALLEY USA , CA 91311

Baseline geo-coordinates

34.2551 , -118.606

Survey type

31 Day. Based on the 31 days prior to the survey date shown above.

Assessment band

REGULAR

Assessment actual value

10.81

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

Flight holding stack identified?

Yes ❌

Count of Flights & Height Band

Assessment Period / Daily Avg. / Hourly Avg.

Count of ALL flights

2,505 / 80.8 / 4.8 ❌ (871)

Flights above 26k feet.

209 / 6.7 / 0.4 ❌ (148)

Flights between 16k and 26k feet

262 / 8.5 / 0.5 ❌ (74)

Flights between 13k and 15k feet

68 / 2.2 / 0.1 ❌ (32)

Flights between 7k and 12k feet

676 / 21.8 / 1.3 ❌ (128)

Flights between 6k and 7k feet

208 / 6.7 / 0.4 ❌ (51)

Flights between 5k and 6k feet

194 / 6.3 / 0.4 ❌ (72)

Flights between 4k and 5k feet

374 / 12.1 / 0.7 ❌ (127)

Flights between 3k and 4k feet

210 / 6.8 / 0.4 ❌ (144)

Flights below 3k feet

304 / 9.8 / 0.6 ❌ (146)

4 or more flights per hour

286 / 9.2 ❌ (64)

9 or more flights per hour

62 / 2.0 ❌ (17)

Departures between 1.5k and 15k feet

553 / 17.8 / 1.0 ❌ (153)

Count of Flights by Hour Band

Assessment Period / Day / Hourly Average

0 AM

213 / 6.9

1 AM

212 / 6.8

2 AM

164 / 5.3

3 AM

116 / 3.7

4 AM

48 / 1.5

5 AM

29 / 0.9

6 AM

14 / 0.5

7 AM

9 / 0.3

8 AM to 9 PM

1,309 / 42.2 / 3.0

10 PM

192 / 6.2

11 PM

188 / 6.1

Averages over assessment period

Time in seconds an aircraft existed in the Airspace Bubble

26 ❌ (22)

Altitude for all flights

10,331 ❌ (16,077)

Altitude of departures between 1.5k and 15k feet

8,736 ✔

Altitude of flights below 20k feet

6,669 ❌ (7,304)

Number of disruptions per day

63.0 ❌ (20)

Percentage of Pass-bys that occur Out-Of-Hours and at Weekends

78 ❌ (43)

Minimum distance from base in miles

0.69

Scale of regular disruption
(0 - low, 25+ high)

Period and Frequency

12.80

Thursday @ 1:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

12.20

Tuesday @ 1:00 - 4 time(s) in 4 weeks. Approx:7 flight events.

10.80

Thursday @ 0:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.60

Wednesday @ 1:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.30

Tuesday @ 19:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

10.10

Wednesday @ 22:00 - 4 time(s) in 4 weeks. Approx:6 flight events.

9.80

Tuesday @ 23:00 - 4 time(s) in 4 weeks. Approx:5 flight events.

9.40

Wednesday @ 23:00 - 4 time(s) in 4 weeks. Approx:5 flight events.

9.20

Wednesday @ 18:00 - 4 time(s) in 4 weeks. Approx:5 flight events.