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Telelogic supports an open architecture and the use of standardized languages. As
an industry leader and technology visionary, Telelogic is actively involved in shaping
the future of enterprise architecture, application lifecycle management, and customer
needs management by participating in industry organizations such as INCOSE, OMG,
The Open Group, Eclipse, ETSI, ITU-T, the TeleManagement Forum, and AUTOSAR.
Headquartered in Malmö, Sweden, with U.S. headquarters in Irvine, California, Telelogic
has operations in 20 countries worldwide. Customers include Airbus, Alcatel, BAE
SYSTEMS, BMW, Boeing, DaimlerChrysler, Deutsche Bank, Ericsson, General Electric,
General Motors, Lockheed Martin, Motorola, NEC, Philips, Samsung, Siemens, Sprint,
Thales, and Vodafone.
1
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
1
ACN-PCN System
AC 150/5335-5A
Presentation to: Transportation Systems Workshop
Name: Rodney Joel - Airport Engineering Division
Date: April 23, 2008
Federal Aviation
Administration
Federal Aviation
Administration 2
Transportation Systems Workshop
April 23, 2008
Annex 14 to
the
Convention
on
International
Civil Aviation
Federal Aviation
Administration 3
Transportation Systems Workshop
April 23, 2008
ICAO
Aerodrome
Design
Manual
Part 3 –
Pavements
4
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
4
ACN-PCN Joint Effort of Industry
Commercial fleet since the
ACN/PCN, method
adopted
ICAO
Adopted
ACN/PCN
method
Commercial fleet when
ACN/PCN, method
adopted
747-400
B777
B777-300ER
MD-11
B787-8
B747-800
A340-600
A380
B707
DC-8
B727
Convair 880
COMET 4
Constellation
B-17 Viscount YS-11
DC-3 Heron
B747
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1930 1940 1950 1960 1970 1980 1990 2000 2010 2020
Airplane Gross Weight (lb)
5
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
5
FAA Guidance on ACN-PCN
AC 150/5335-5A
STANDARDIZED METHOD OF REPORTING
AIRPORT PAVEMENT STRENGTH – PCN
Revised September, 2006
2005 - PCN field re-activated in 5010 Database
6
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
6
ACN/PCN Definitions
• ACN
“A number expressing the relative effect of an
aircraft on a pavement for a specified standard
subgrade strength.”
• PCN
“A number expressing the bearing strength of a
pavement for unrestricted operations.”
Aerodrome Design Manual, Part 3 Pavements, Chapter 1
7
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
7
A pavement with a given PCN can support
without weight restriction, an airplane with an
ACN rating equal to or less than the pavement
PCN value.
ACN/PCN System - Concept
8
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
8
• Why not continue reporting allowable “Gear” load?
• Pavement thickness design requires not only the load
magnitude but also the frequency of application.
Therefore if an allowable gear load is reported, some
knowledge about the frequency of load application is
necessary for proper implementation.
• For airport pavement applications we use the term “annual
departures” to discuss frequency
ACN/PCN System
9
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
9
20
25
30
35
40
45
50
55
60
65
1 10 100 1000 10000 100000
Annual Departures (Log Scale)
Required Thickness of Flexible Pavement .
2D-300
2D-400
2D-500
With CBR=5, New Alpha Factors
Constant Weight - Increasing Departures
Uniform Wheel Spacings 2D landing gear –
fixed wheel spacing
Weights 300k, 400k,
& 500k
Increasing Frequency
ACN/PCN System
Increasing Thickness
2 Duals in
Tandem
2D
300k
500k
400k
10
Transportation Systems Workshop
April 23, 2008
Federal Aviation
Administration
　
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