AIRPORT PLANNING MANUAL 7.8. RIGID PAVEMENT REQUIREMENTS, LCN METHOD This LCN Method presents curves for rigid pavements. They have been built using procedures and curves in ICAO Aerodrome Design Manual, Part 3 - Pavements, Document 9157-AN/901, 1983. The same chart includes the data of equivalent single-wheel load versus radius of relative stiffness. To determine the aircraft weight that can be accommodated on a particular rigid airport pavement, both the LCN of the pavement and the radius of relative stiffness must be known. The radius of relative stiffness values is obtained from a table. This table presents the radius of relative stiffness values based on Young’s modulus (E) of 4,000,000 psi and Poisson’s ratio (µ) of 0.15. For convenience in finding this radius based on other values of E and µ, the curves are included. For example, to find an RRS value based on an E of 3,000,000 psi, the “E” factor of 0.931 is multiplied by the RRS value found in figure 7.6.3. The effect of the variations of µ on the RRS value is treated in a similar manner. EFFECTIVITY: ALL Section 7 Page 7-14 Dec08/03 b-apm1346