ICAO's ACN-PCN Method and Aircraft-Pavement Interaction

by Marc Stet,
Egbert Beuving,

Abstract: Multi-wheel gear assemblies of future aircraft are not compatible with pavements rated in the ACN-PCN system given by the International Civil Aviation Organization (ICAO). The Aircraft Classification Number (ACN) or the aircrafts detriment exceeds the Pavement Classification Number (PCN) representing the pavements load bearing capacity. This problem is especially relevant to flexible pavements on an ultraflow subgrade strength. The paper discusses the structural detriment of multiwheel gear assemblies of B747-400 and B777 aircraft in relation to their ACN. The impact of the loads is evaluated by means a BISAR multi-layer analysis. Based on these computations and by taking ICAO's ACN for B747-400 as a reference, an estimation of B777's ACN has been made.

Subject Headings: Aircraft and spacecraft | Load bearing capacity | Impact loads | Pavement condition | Soil dynamics | Soil classification

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