Representative aircraft Lmax data

This page provides representative Lmax data as a function of aircraft height above ground, together with information on how the data have been generated and its uncertainty.

Calculation Process

Data is derived from the UK civil Aircraft Noise Contour model, “ANCON” version 2. This has been used since 1995 to calculate noise contours at the designated London airports. Every summer the ANCON model is validated with hundreds of thousands of measurements obtained from around Heathrow, Gatwick and Stansted airports. The calculation process requires that noise levels are generated for locations beneath an aircraft flight track. Since each type of aircraft reaches a certain height at different distances after take-off (and likewise before landing prior to intercepting the standard 3° glide path), The CAA Environmental Research & Consultancy Department (ERCD) identified the unique distance from start-of-take-off roll and to touchdown, for each ANCON aircraft type category at 500ft intervals. These locations were then used to determine the corresponding mean Lmax levels for departure and arrival operations for each ANCON type. Tables 2 & 3 below provide combined tables of representative Lmax levels.

Aircraft groupings

In order to simplify the data, it has been grouped in logical categories of aircraft size. Data has then been linearly averaged across different specific types and across the airports to provide an overall average Lmax value for each altitude and operating mode. The specific groupings chosen are listed in Table 1.

Table 1: Aircraft groupings and their respective ANCON types
Aircraft Grouping Specific ANCON Types
50-70 seat turboprop ATR-42, ATR-72, DHC Dash-8-100/200/300/400
50 seat regional jet Bombardier CRJ, Embraer 135/145
70-90 seat regional jet Bombardier CRJ700/900, Embraer 170/175/190/195
125-180 seat single-aisle 2-eng jet Airbus A318/319/320/321, Boeing 737-600/700/800/900
250 seat twin-aisle 2-eng jet Airbus A330, Boeing 767-300/400
300-350 seat twin-aisle jet Airbus A340-200/300/500/600, Boeing 777-200/300/ER
400 seat 4-eng jet Boeing 747-400
500 seat 4-eng jet Airbus A380

Using the groupings listed in Table 1, Tables 2 and 3 below provide representative Lmax data for arrivals and departures respectively.

Table 2: Arrivals Lmax levels by aircraft grouping
Height (ft) Turboprop 50 seat regional jet 70-90 seat regional jet 125-180 seat single-aisle 2-eng jet 250 seat twin-aisle 2-eng jet 300-350 seat twin-aisle jet 400 seat 4-eng jet 500 seat 4-eng jet
1000-2000 79-70 73-63 77-67 77-69 84-74 83-73 86-77 85-78
2000-3000 70-66 63-56 67-61 69-64 74-68 73-67 77-71 78-72
3000-4000 66-64 56-55 61-57 64-61 68-64 67-63 71-67 72-68
4000-5000 64-62 57-56 61-59 64-60 63-60 67-64 68-65
5000-6000 62-61 56-55 59-57 60-58 60-57 64-61 65-62
6000-7000 61-59 57-56 58-56 57-56 61-59 62-60
7000-8000 59-57 56-55 56-55 56-56 59-57 60-58
8000-9000 57-57 56-55 57-56 58-56
9000-10000 57-56 56-56 56-55
10000-11000 56-55 56-55
11000-12000
Table 3: Departure Lmax levels by aircraft grouping
Height (ft) Turbo-prop 50 seat regional jet 70-90 seat regional jet 125-180 seat single-aisle 2-eng jet 250 seat twin-aisle 2-eng jet 300-350 seat twin-aisle jet 400 seat 4-eng jet 500 seat 4-eng jet
1000-2000 78-71 78-70 85-75 85-75 92-83 90-81 92-84 91-84
2000-3000 71-67 70-65 75-68 75-70 83-77 81-75 84-79 84-80
3000-4000 67-64 65-60 68-64 70-66 77-73 75-71 79-75 80-76
4000-5000 64-62 60-57 64-61 66-63 73-69 71-67 75-72 76-73
5000-6000 62-60 57-55 61-58 63-60 69-66 67-64 72-69 73-71
6000-7000 60-58 58-56 60-59 66-64 64-62 69-67 71-68
7000-8000 58-56 56-56 59-58 64-61 62-60 67-64 68-66
8000-9000 56-56 56-55 58-57 61-59 60-58 64-62 66-65
9000-10000 56-55 57-56 59-58 58-57 62-60 65-63
10000-11000 56-56 58-57 57-56 60-60 63-62
11000-12000 56-56 57-56 56-55 60-59 62-60
12000-13000 56-55 56-56 59-58 60-59
13000-14000 56-55 58-58 59-58
14000-15000 58-57 58-55
15000-16000 57-57
16000-17000 57-57
17000-18000 57-56
18000-19000 56-55
19000-20000
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