pavement classification number
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pavement classification number (PCN)
Finally, it indicates whether the pavement was evaluated by technical means or based on past aircraft use of the pavement. A typical PCN published figure is PCN: 80/R, in which “PCN: 80” is the PCN value and “R” indicates rigid pavement. For flexible pavement, “F” is used. The pavement subgrade categories are A for high, B for medium, C for low, and D for ultralow subgrades. The maximum tire pressure authorized for the pavement is denoted by W = high, no limit; X = medium, limited to 217 psi; Y = low, limited to 145 psi; and Z = very low, limited to 73 psi. The pavement evaluation method is either T, indicating technical evaluation, or U, based on actual aircraft usage of the pavement. Pavement strength may also be expressed with the help of the load classification number (LCN).