Article 103

Conditions for collision avoidance manoeuvres in case of HIE

1. When the CA entity referred to in Article 64(1), publishes a High Interest Event Alert between two manoeuvrable spacecraft and decides that one of the two concerned spacecraft have to perform a Collision Avoidance Manoeuvre (CAM), their proposed CAM shall be based on the following principles:

(a) take the utmost account of the protection of crewed vehicles;

(b) reduce the initial collision risk by at least one order of magnitude below the manoeuvre threshold for High Interest Event Alert; and

(c) not create unreasonable risks of secondary conjunctions.

2. Where both spacecraft are registered to the CA entity referred to in Article 64(1), Union spacecraft operators shall seek to agree on a strategy to implement the CAM referred to in paragraph 1under the coordination of that CA entity, within a reasonable period.

3. If no agreement can be found under paragraph 2 within a reasonable period, the CA entity referred to in Article 64(1) shall propose a strategy for action. That strategy shall take into consideration the right of the way rules, based on at least the following elements:

(a) protection of crew vehicle;

(b) involvement of a spacecraft that is part of a constellation;

(c) the operational capacity for CA manoeuvres;

(d) the state of the spacecraft;

(e) the eccentricity of the spacecraft’s orbits;

(f) the age of the spacecraft;

(g) the phase and type of the respective space mission.

4. Where one of the two spacecraft is not registered to the CA entity referred to in Article 64(1), that entity shall establish contact with the respective spacecraft.

5. In case of successful contact under paragraph 4, the CA entity referred to in Article 64(1) shall, to the extent possible:

(a) exchange information on the tools and methods used for calculation of collision risks;

(b) share all the necessary data and calculation results to ensure avoidance of the collision;

(c) determine, in collaboration with both spacecraft’s operators, the best collision avoidance’s manoeuvres, taking into consideration the elements of the manoeuvres’ action plan specified to in paragraph 3.

6. Where the contacts referred to in paragraph 4 are unsuccessful or if, after a reasonable period of time, contacts cannot be initiated, the CA entity referred to in Article 64(1) shall recommend to the Union spacecraft operator a strategy for action that ensures at least the respect of the principles outlined in paragraph 1 and shall inform the other Union spacecraft operator about the intended action.

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