ACN/PCN module in PEP Monique FUERI Director Operational Performance Presented by:
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ACN/PCN module in PEP Monique FUERI Director Operational Performance Presented by:
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Transcript of ACN/PCN module in PEP Monique FUERI Director Operational Performance Presented by:
ACN/PCN module in PEP
Monique FUERIDirector Operational Performance
Presented by:
April 2007 ACN/PCN module in PEP Page 2© A
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Content
ACN/PCN method
ACN determination
ACN/PCN PEP module
Conclusion
April 2007 ACN/PCN module in PEP Page 3© A
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Content
ACN/PCN method
ACN determination
ACN/PCN PEP module
Conclusion
April 2007 ACN/PCN module in PEP Page 4© A
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ACN/PCN method
• Aim: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.
April 2007 ACN/PCN module in PEP Page 5© A
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• 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 typeSubgrade strength categoryTire pressure categoryPavement calculation method
ACN/PCN method
Pavement Classification number:
April 2007 ACN/PCN module in PEP Page 6© A
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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 typeSubgrade strength categoryTire pressure categoryPavement calculation method
ACN/PCN method
Pavement typePavement typeR : rigidF : flexible
Pavement typePavement typeR : rigidF : flexible
April 2007 ACN/PCN module in PEP Page 7© A
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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 typeSubgrade strength categoryTire pressure categoryPavement calculation method
ACN/PCN method
Subgrade strength Subgrade strength categorycategoryA : highB : mediumC : lowD : ultra low
Subgrade strength Subgrade strength categorycategoryA : highB : mediumC : lowD : ultra low
April 2007 ACN/PCN module in PEP Page 8© A
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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 typeSubgrade strength categoryTire pressure categoryPavement calculation method
ACN/PCN method
Tire pressure categoryTire pressure category(maximum permissible tire pressure)W : no limitX : to 1.5 MPaY : to 1.0 MPaZ : to 0.5 MPa
Tire pressure categoryTire pressure category(maximum permissible tire pressure)W : no limitX : to 1.5 MPaY : to 1.0 MPaZ : to 0.5 MPa
April 2007 ACN/PCN module in PEP Page 9© A
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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 typeSubgrade strength categoryTire pressure categoryPavement calculation method
ACN/PCN method
Pavement calculation methodPavement calculation methodT : technicalU : using a/c experience
Pavement calculation methodPavement calculation methodT : technicalU : using a/c experience
April 2007 ACN/PCN module in PEP Page 10© A
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ACN/PCN method
PCN 58 R / B / W / TExample :
The bearing capacity of a rigid pavement rigid pavement restingon a foundation of medium strength has given,by technical assessment, a PCN = 58.There is no tire pressure restriction.
April 2007 ACN/PCN module in PEP Page 11© A
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• 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
ACN/PCN method
Aircraft Classification number:
April 2007 ACN/PCN module in PEP Page 12© A
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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
April 2007 ACN/PCN module in PEP Page 13© A
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ACN determination
• ACN for Airbus aircraft can be determined using the Airplane Characteristics for Airport Planning Manual
April 2007 ACN/PCN module in PEP Page 14© A
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Content
ACN/PCN method
ACN determination
ACN/PCN PEP module
Conclusion
April 2007 ACN/PCN module in PEP Page 15© A
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ACN determination
April 2007 ACN/PCN module in PEP Page 16© A
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ACN determination
April 2007 ACN/PCN module in PEP Page 17© A
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Content
ACN/PCN method
ACN determination
ACN/PCN PEP module
Conclusion
April 2007 ACN/PCN module in PEP Page 18© A
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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.
April 2007 ACN/PCN module in PEP Page 19© A
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ACN/PCN PEP module
• New PEP module: ACN and LCN calculationACN/PCN
Runway CalculationACN/PCN methodLCN method
DRAFT
April 2007 ACN/PCN module in PEP Page 20© A
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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
April 2007 ACN/PCN module in PEP Page 21© A
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ACN/PCN PEP module
• Center of Gravity Position Influence
A330-200 ACN's Flex Cat. B
MTOW 230 000 kg
MLW 182 000 kg
MZFW 170 000 kg
Flight --><-- Take-Off & Landing
Take-Off -->
Landing -->
<-- Flight
110
130
150
170
190
210
230
250 15
10
20 25 30 35
15 20 25 30 35 40 45
40
ACN 65 F/B
ACN 60 F/B
ACN 55 F/B
ACN 50 F/B
ACN 45 F/B
ACN 40 F/B
ACN 35 F/B
ACN 30 F/B
110
130
150
170
190
210
230
250
45
Tires 1400x530R23 PR36Tire Pressure (loaded): 14.2bar (206psi)
max aft CG Position: 37.5% MACMax Taxi Weight: 230.9t
Same ACN but several tons of Payload/Fuel difference
ACN’s definedat MRW andmax aft CG
April 2007 ACN/PCN module in PEP Page 22© A
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Content
ACN/PCN method
ACN determination
ACN/PCN PEP module
Conclusion
April 2007 ACN/PCN module in PEP Page 23© A
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Conclusion
• New ACN/PCN module will be fully integrated in the PEP user-friendly interface
• It will allow:ACN computation of a given aircraftMaximum aircraft weight for a given runwayLCN computation
• Availability: mid-2008
