presented to: by: venue: date: federal aviation administration comfaa 3.0 update airport pavement...
TRANSCRIPT
Presented to:
By:
Venue:
Date:
Federal AviationAdministration
COMFAA 3.0 Update
Airport Pavement Working Group
Gordon Hayhoe, ANG-E262
Sheraton Atlantic City Convention Center
April 25, 2012
2Federal AviationAdministration
Airport Pavement Working Group – COMFAA 3.0April 25, 2012
COMFAA 3.0 Outline
• Brief PCN background.• Current AC and COMFAA.• Changed radius of relative
stiffness multiplier for rigid ACN.• Other possible changes to the
AC and COMFAA.
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
• The aircraft mfg. provides the ACN.
• In the US, the airport determines the PCN using FAA advisory circular guidance.
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
Technical Method for PCN
• Find the Maximum Allowable Gross Weight of the Critical Aircraft for it to be able to operate at the Existing Traffic Level on the Existing Pavement.
• The ACN of the Critical Aircraft at the Maximum Allowable Gross Weight is then the PCN of the pavement.
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
PCN Calculation for Large-Hub Airports with AC 150/5335-5A
• Airports with a large number of narrow-body aircraft (737, A320, etc.) and a relatively small number of wide-body aircraft (777, A360, 787, etc.) can:– Have one of the narrow bodies as the critical aircraft,
which will give a fairly low PCN.– Have one or more of the wide-bodies with ACN values at
operating weights much higher than the PCN determined by the narrow body critical aircraft.
• This will mean that wide body aircraft in the original design mix might not be eligible for operation under the ACN-PCN system.
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
The AC 150/5335-5B PCN Methodology
• The AC 150/5335-5A methodology finds the critical aircraft and then finds the ACN of that aircraft at the maximum allowable gross weight. That ACN is then the PCN.
• The -5B methodology is the same except that the ACN at maximum allowable gross weight is calculated for all of the aircraft in the mix.
• The largest ACN value is then selected as the PCN.
• There is a need for a way to eliminate “occasional or overload” aircraft from the mix.
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
AC 150/5335-5B
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
AC 150/5335-5B, Applicability
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
AC 150/5335-5B, Downloads
http://www.faa.gov/airports/resources/advisory_circulars/index.cfm/go/document.list
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
AC 150/5335-5B, Downloads
http://www.faa.gov/airports/resources/advisory_circulars/index.cfm/go/document.list
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
Current COMFAA 3.0
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
Current COMFAA – Aircraft Window
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
Current COMFAA – Details Window
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
Changes To Be Made to COMFAA
• The cutoff radius for rigid pavement ACN computation will be changed from 3.0 to 5.0 times the radius of relative stiffness.
• Values for only the applicable support strength will be included in Table 2. PCN Values in the Details Window.
• Total CDF will be added to Table 2. PCN Values in the Details Window.
• Output text files optional by user selection.• Updated Airbus aircraft library.
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
Rigid Cutoff = 3.0, C-17A
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Airport Pavement Working Group – COMFAA 3.0April 25, 2012
Rigid Cutoff = 5.0, C-17A
17Federal AviationAdministration
Airport Pavement Working Group – COMFAA 3.0April 25, 2012
Updated COMFAA – Details Window
18Federal AviationAdministration
Airport Pavement Working Group – COMFAA 3.0April 25, 2012
Updated Airbus Library
19Federal AviationAdministration
Airport Pavement Working Group – COMFAA 3.0April 25, 2012
Possible Modification to AC 150/5335-5
• Expanded and more precise guidance on when low-traffic aircraft should be considered overload rather than part of the traffic mix.
• Contact Jeffrey Rapol for more information at [email protected]