Surface Characteristics [SCH]

AIXM Model Overview

Coding guidelines

Pavement Classification Number (PCN)

The Pavement Classification Number (PCN) is composed by 5 attributes:

• classPCN
  The bearing strength of a pavement for unrestricted operations.
• pavementTypePCN
  The pavement behaviour (rigid or flexible) used for determining the Pavement Classification Number (PCN).
• pavementSubgradePCN
  An indication of the pavement subgrade strength related to the Pavement Classification Number (PCN).
• maxTyrePressurePCN
  The maximum allowable tire pressure category related to the Pavement Classification Number (PCN), as a category.
• evaluationMethodPCN
  The method used to rate a runway pavement.

The figure below gives an example of a PCN specification:

If the bearing strength of a rigid pavement, resting on a medium strength subgrade, has been assessed by technical evaluation to be PCN 80 and there is no tire pressure limitation, then the reported information would be as follows:

Load Classification Number (LCN)

The classLCN is used to code the value, which denotes the peak bearing moment the surface can handle repeatedly without shortening its service life.

Single Isolated Wheel Load (SIWL)

Two attributes are used to describe the Single Isolated Wheel Load (SIWL).

The weightSIWL attribute represents the maximum calculated load on each tire of a landing gear assembly that a movement area surface can support.

The tyrePressureSIWL attribute represents the maximum aircraft tire pressure that a movement area surface can support.

All Up Weight (AUW)

The weightAUW attribute represents the maximum total value of the weight of an aircraft that a movement area surface may support, regardless of the landing gear configuration of the aircraft.

Coding Rules for Surface Characteristic

Coding Examples

See topics Runway and TLOF.