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3.1.4.1  In order to ensure that airspace is utilised in a safe and efficient manner and that in the near future, a co-ordination process for airspace planning between neighbouring States will be properly set-up, there is a need first that all ECAC States establish formerly National Airspace Planning Arrangements.
3.1.4.2  Such National Airspace Planning Arrangements should clearly establish policies for the effective allocation and use of airspace and its supporting infrastructure and should define the process and responsibilities to ensure that proposed changes to airspace are initiated, considered, refined, approved and finally implemented in a safe and effective manner.
3.1.4.3  To that end, an outline of such airspace change process will be provided in the EUROCONTROL Handbok for Airspace Management to assist ECAC States in developing their National Airspace Planning Arrangements through which subsequent changes to the national airspace organisation could be made taking into account the needs of all stakeholders.

3.2  TEMPORARY AIRSPACE ALLOCATION (TAA) PROCESS
3.2.1  General Presentation of the TAA Process
3.2.1.1  Since the demands on the use of airspace are manifold, some of which are not compatible with civil aviation (e.g. rocket firing) and because there exist sensitive areas on the ground that need protection from possible disturbance by over-flying aircraft, it is recognised that there is a need for States to establish airspace restrictions of varying degrees of severity. In addition, there are aerial activities by specific users or user groups, which may require the reservation of portions of the airspace for their exclusive use for determined periods of time.
3.2.1.2  Whenever such restrictions and/or reservations have to be imposed, they invariably constitute a limitation to the free and unhampered use of that airspace with the associated effects on flight operations. It is therefore evident that the scope and duration of reservation/restriction established should be subject to very stringent scrutiny in order to keep undesirable effects to the minimum consistent with the reason causing their creation.
Page 3-2  Released Issue Edition: 2.0
3.2.1.3  To achieve this and in order to improve efficiency and flexibility of aircraft operations, States will endeavour to use the “Temporary Airspace Allocation” (TAA) process summarised in a diagram at Annex 3A.
3.2.1.4  Definition of the TAA Process :
The Temporary Airspace Allocation (TAA) Process consists in the allocation process of an airspace of defined dimensions assigned for the temporary reservation (TRA/TSA) or restriction (D/R) and identified more generally as an "AMC-manageable" area.
3.2.1.5  The TAA Process involves all AMC-manageable areas that are subject to allocation at ASM Level 2 & 3. These manageable areas are either formal structures established for the temporary reservation of airspace (see paragraph 3.2.3) or the temporary restriction of airspace (see paragraph 3.2.4) that are allocated at Level 2 & 3.

3.2.2  Validation of Activities Requiring Airspace Reservation/Restriction
3.2.2.1  General
3.2.2.1.1  In general airspace should only be reserved or restricted for specific periods of time which should stop as soon as the associated activity ceases. In practise, the TAA process includes all the AMC-manageable structures whenever their use can be linked to a daily allocation for the duration of a planned activity. Thus, when designating airspace volumes, States should establish, as far as possible, AMC-manageable structures.
3.2.2.2  Criteria governing the evaluation of national airspace needs and validation of activities
3.2.2.2.1  When States initiate their evaluation of short-term national airspace needs, or have to deal with a new airspace request, they should : -ensure that the activities relating to the request for temporary reservation or restriction are valid and justify such action;
　
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