An entity grouping together the attributes that model characteristics of an airport surface (e.g. Runway or TLOF), such as strength, material, etc.
The composition attribute is used to code the type of the predominant material of which a surface of the movement area is composed.
Note
The preparation technique(s) applied to a surface composition are coded by the preparation attribute.
The quality of the surface of an airport surface will be coded with the surfaceCondition attribute.
Pavement Classification Number (PCN)
Note
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
| Identifier | Data Encoding Rule | Justification | Data Verification Rule (UID) | Remarks |
|---|---|---|---|---|
| SCH-101 | If VAL_PCN_CLASS is specified, then CODE_PCN_MAX_TIRE_PRESSURE or VAL_PCN_MAX_TIRE_PRESSURE must be specified. | EAD | TBD | |
| SCH-102 | If VAL_PCN_CLASS is specified, then CODE_PCN_PAVEMENT_TYPE, CODE_PCN_PAVEMENT_SUBGRADE and CODE_PCN_EVAL_METHOD must be specified. | EAD | TBD | |
| SCH-103 | As a plausibility rule, the value of VAL_PCN_CLASS should be lower than 200. | EAD | TBD | |
| SCH-104 | As a plausibility rule, the value of VAL_PCN_MAX_TIRE_PRESSURE should be lower than 2.00 | EAD | TBD | |
| SCH-105 | As a plausibility rule, the value of VAL_LCN_CLASS should be lower than 200. | EAD | TBD | |
| SCH-106 | If VAL_SIWL_WEIGHT is specified, then VAL_SIWL_TIRE_PRESSURE must be specified. | EAD | TBD |