Restriction, Activation and Schedules

Introduction

For special activity airspace, PANS-AIM requires as part of the minimum AIP data set to provide information about the type of restriction or nature of hazard. In case of an ADIZ (Air Defense Information Zone), the risk of interception in the event of penetration shall be indicated.

In addition, information on system and means of activation announcements, together with information pertinent to civil flights and applicable ADIZ procedures shall be provided.

The status might carry the following values:

For the AIP data set, the status should be coded:

• as ACTIVE for the time and levels when the airspace is actually operating;
• as AVBL_FOR_ACTIVATION when the actual activation is "announced by NOTAM", which is a frequently encountered situation for certain D and R areas;
• as' INACTIVE' for the time and levels when the airspace is know to not be operating.

Activity types

In addition to the list of activity types listed above, the following activities might occur in relation with certain danger areas. They should be encoded prefixed by OTHER:, as indicated below:

Vertical layer

The restriction may be limited within the airspace to a certain vertical portion of airspace by using the AirspaceLayer class. The vertical limits of the airspace concerned may be defined by a certain upper and lower limit of the AirspaceVolume.

Schedules

For ATS airspace, Appendix 1 of PANS-AIM (Aeronautical Data Catalogue) defines the "Hours of applicability" for the airspace and in addition the "Hours of Service", which are "the operational hours of the station serving the unit".

However, in an AIP the first item is only published for ATS airspaces of section AD 2.17, whereas the latter is only published for ATS airspace listed in section ENR 2.1.

For special activity airspaces the "Time of activity" is defined as "Time interval when the special activity takes place".

For the general coding guidelines for Timesheet refer to topic Common coding patterns.

Hours of Applicability

For ATS airspaces published in "AD 2.17 Air traffic services airspace" PANS-AIM requires:

6) hours of applicability;

In AIXM, this information will be provided via the Airspace.activation property. The AirspaceActivation class and its properties are used to code the detailed information, including the status and the timeInterval.

Actually, in most AIP this information is not published but rather the hours of operation of the frequency the unit is providing the service for the airspace are published. (see AIP example below).

Hours of Service

This information is required for ATS airspace usually published in "ENR 2.1 FIR, UIR, TMA AND CTA":

3) call sign of aeronautical station serving the unit and language(s) used, specifying the area and conditions, when and where to be used, if applicable;

In AIXM, this information will be provided via the Service.availability', see ATS Unit providing Service.

Time of Activity

This information is required for special activity airspace usually published section in "ENR 5":

 including time of activity.

In AIXM, this information will be provided via the Airspace.activation property. The AirspaceActivation class and its properties are used to code the detailed information, including the status and the timeInterval. See also topic Restriction & Activation.

A status has to be coded, in order to support the AIXM Digital NOTAM Event concept .

Coding Example

The figure below gives a simple example of an airspace activation for BERTRIX AREA.

It is available for activation by a defined schedule. Its actual activation is announced by NOTAM. When activated, the vertical limits may be adjusted to the applicable airspace layer portion.

More coding examples can be found in the AIP Data Set - Specimen (DONLON).

References