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-consider the feasibility of avoiding any potential hazard and/or disruption to other airspace users, through appropriate civil/military co-ordination procedures, so that a joint use of airspace will be possible;
-if the joint use of airspace is not possible, determine the needs in terms of space, time and the conditions of use, that are required to confine the activities, to minimise the potential hazard and to minimise disruption to other airspace users;
- assess the level of risk for other airspace users and determine how a request can best be met with the least interference to other users.
3.2.2.3  Criteria governing the choice between Airspace Reservation and Restriction
3.2.2.3.1  Having assessed the need for an AMC-manageable area, where the activities are suitable for daily management and allocation at Level 2, States should : -whenever possible, establish an airspace reservation using guidelines defined in Chapter 3.2.3;
- if not, -where either because of difficulty in the notification of airspace status to interested airspace users or because of national legal requirements -establish an airspace restriction (R or D) in accordance with guidelines defined in Chapter 3.2.4.
3.2.2.3.2  Finally, States should keep established airspace reservations and airspace restrictions under regular review so as to determine whether they are still required or whether modification may be necessary in the light of changed requirements.
Edition: 2.0 Released Issue  Page 3-3

3.2.3  Guidelines for the Establishment of Airspace Reservation
3.2.3.1  Activities Requiring Temporary Airspace Reservation
3.2.3.1.1  States should establish, whenever possible, an airspace reservation over their land and/or territorial waters :
-in response to an operational need to accommodate civil, military, R&D, training or test-flights which, due to the nature of their activities, must be temporarily “protected” from non-participating traffic;
-for military training activities conducted under positive control, when aircraft manoeuvres are unpredictable, sensitive to external interference, or difficult to alter without adversely affecting the mission;
-for civil and military activities where the level of risk is not permanently present and where a temporary airspace reservation or segregation for a period is manageable at Level 2.
3.2.3.1.2  States should clearly identify the activities for which the reservation/segregation of airspace is required from other activities and assess if they can be conducted simultaneously with traffic transiting together with their location in relation to the major traffic flows, in order to define the type of airspace reservation to be applied.
3.2.3.2  Different Types of Temporary Airspace Reservation (TRA, TSA)
3.2.3.2.1  While it is recognised that there exist legitimate reasons for establishment of airspace reservations, experience also indicates that depending on the activities, some “reserved“ airspace may be transited by another airspace user under specific conditions and/or based on appropriate co-ordination procedures. For this reason, different areas can be established taking into consideration the activity that would take place associated with the transit possibility.
3.2.3.2.2  Temporary Reserved Area (TRA) is a defined volume of airspace normally under the jurisdiction of one aviation authority and temporarily reserved, by common agreement, for the specific use by another aviation authority and through which other traffic may be allowed to transit, under ATC clearance.
3.2.3.2.3  Any ATC clearance for crossing an active TRA will be subject to prior co-ordination requirements in accordance with appropriate co-ordination procedures established between civil and military ATS units concerned.
3.2.3.2.4  Temporary Segregated Area (TSA) is a defined volume of airspace normally under the jurisdiction of one aviation authority and temporarily segregated, by common agreement, for the exclusive use by another aviation authority and through which other traffic will not be allowed to transit.
　
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