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How does aircraft manufacturers indicate the pavement loading intensity of their aircrafts ? What is the the ACN-PCN system ?

 How do aircraft manufacturers indicate the pavement loading intensity of their aircraft? What is the ACN-PCN system?


  •  How do aircraft manufacturers indicate the pavement loading intensity of their aircraft? What is the ACN-PCN system?
  •  In 1978, ICAO adopted a unique system (ACN-PCN) for airports to express the load-bearing capacity of airfield pavements & aircraft OEMs to express pavement loading intensity.
  •  Aircraft Classification Number (ACN) is used to express the effect of an aircraft on different pavements with a single unique number that varies according to aircraft weight & configuration.
  •  The OEM provides the official ACN value. Calculation of the ACN requires details of operational characteristics of the aircraft, such as maximum aft center of gravity, maximum ramp weight, wheel spacing & tire pressure etc.
  •  Pavement Classification Number (PCN) is the load-carrying capacity of pavement can be expressed by an unique number, without specifying detailed information about the pavement structure.
  •  Major airports publish their PCN based on the ACN value of the most demanding aircraft.
  •  PCN values are reported in a coded format using 5 codes.
Example: 39/R/B/W/T
 Five Factors of the Coding are:
 Numerical PCN Value
Pavement Type
Subgrade Category
Allowable Tire pressure
 Method used to determine the PCN value



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