1. ACN/PCN module in PEP Monique FUERI Director Operational Performance
Presented by:
ACN/PCN module in PEP

2. Content ACN/PCN method ACN determination ACN/PCN PEP module Conclusion
ACN/PCN module in PEP
April 2007

3. Content ACN/PCN method ACN determination ACN/PCN PEP module Conclusion
ACN/PCN module in PEP
April 2007

4. ACN/PCN method Aim: Numerous methods developed:
Considering a runway with a given bearing strength, can a given aircraft with a given load operate on this runway without damaging the pavement ?
Numerous methods developed:
44 methods in USA in the 80’s
1982: ACN/PCN method developed by ICAO
Former official ICAO method: LCN (Load Classification Number) still sometimes used.
ACN/PCN module in PEP
April 2007

5. Pavement Classification number:
ACN/PCN method
The PCN expresses the bearing capacity of a pavement for unlimited operation
The PCN is provided by airport authorities
The PCN is qualified by:
Pavement type
Subgrade strength category
Tire pressure category
Pavement calculation method
Pavement Classification number:
ACN/PCN module in PEP
April 2007

6. ACN/PCN method Pavement Classification Number:
The PCN expresses the bearing capacity of a pavement for unlimited operation
The PCN is provided by airport authorities
The PCN is qualified by:
Pavement type
Subgrade strength category
Tire pressure category
Pavement calculation method
Pavement type
R : rigid
F : flexible
ACN/PCN module in PEP
April 2007

7. ACN/PCN method Pavement Classification Number:
The PCN expresses the bearing capacity of a pavement for unlimited operation
The PCN is provided by airport authorities
The PCN is qualified by:
Pavement type
Subgrade strength category
Tire pressure category
Pavement calculation method
Subgrade strength category
A : high
B : medium
C : low
D : ultra low
ACN/PCN module in PEP
April 2007

8. ACN/PCN method Pavement Classification Number:
The PCN expresses the bearing capacity of a pavement for unlimited operation
The PCN is provided by airport authorities
The PCN is qualified by:
Pavement type
Subgrade strength category
Tire pressure category
Pavement calculation method
Tire pressure category
(maximum permissible tire pressure)
W : no limit
X : to 1.5 MPa
Y : to 1.0 MPa
Z : to 0.5 MPa
ACN/PCN module in PEP
April 2007

9. ACN/PCN method Pavement Classification Number:
The PCN expresses the bearing capacity of a pavement for unlimited operation
The PCN is provided by airport authorities
The PCN is qualified by:
Pavement type
Subgrade strength category
Tire pressure category
Pavement calculation method
Pavement calculation method
T : technical
U : using a/c experience
ACN/PCN module in PEP
April 2007

10. ACN/PCN method PCN 58 R / B / W / T
Example :
The bearing capacity of a rigid pavement resting
on a foundation of medium strength has given,
by technical assessment, a PCN = 58.
There is no tire pressure restriction.
ACN/PCN module in PEP
April 2007

11. Aircraft Classification number:
ACN/PCN method
The ACN expresses the relative effect of an aircraft on a pavement for a specified standard subgrade
ACN depends on aircraft parameters and runway parameters:
Aircraft parameters:
weight, C.G. position,landing gear geometry (twin gear or bogie), tire pressure
Runway parameters:
pavement type, subgrade category
Aircraft Classification number:
ACN/PCN module in PEP
April 2007

12. ACN/PCN method Unrestricted operation if ACN is less or equal to PCN
Overload operation is possible depending on country and airport policy.
ICAO rule for overload operations:
10% PCN margin for flexible pavements
5% PCN margin for rigid pavements
Annual number of overload movements less than 5% of total annual movements
ACN/PCN module in PEP
April 2007

13. ACN determination
ACN for Airbus aircraft can be determined using the Airplane Characteristics for Airport Planning Manual
ACN/PCN module in PEP
April 2007

14. Content ACN/PCN method ACN determination ACN/PCN PEP module Conclusion
ACN/PCN module in PEP
April 2007

15. ACN determination
ACN/PCN module in PEP
April 2007

16. ACN determination
ACN/PCN module in PEP
April 2007

17. Content ACN/PCN method ACN determination ACN/PCN PEP module Conclusion
ACN/PCN module in PEP
April 2007

18. ACN/PCN PEP module
With the increasing number of Airbus aircraft and Airbus operators, more and more destinations have low strength runways.
Runway loading aspects start playing an important role in landing fee determination.
ACN determination with the curves presently published may be fastidious and lead to errors.
ACN/PCN module in PEP
April 2007

19. DRAFT ACN/PCN PEP module New PEP module: ACN and LCN calculation
ACN/PCN module in PEP
April 2007

20. ACN/PCN PEP module
Compute ACN and LCN for every pavement type for given aircraft data
Compute maximum aircraft weight for a given runway
Possibility to introduce the PCN value of each runway in the airport database managed by the airport manager is being studied
Provide a graphical output: ACN function of aircraft C.G. for a given pavement type
ACN/PCN module in PEP
April 2007

21. ACN’s defined at MRW and max aft CG
ACN/PCN PEP module
Center of Gravity Position Influence
ACN’s defined at MRW and max aft CG
Same ACN but several tons of Payload/Fuel difference
ACN/PCN module in PEP
April 2007

22. Content ACN/PCN method ACN determination ACN/PCN PEP module Conclusion
ACN/PCN module in PEP
April 2007

23. Conclusion
New ACN/PCN module will be fully integrated in the PEP user-friendly interface
It will allow:
ACN computation of a given aircraft
Maximum aircraft weight for a given runway
LCN computation
Availability: mid-2008
ACN/PCN module in PEP
April 2007

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