Technical services may subcontract some of their activities for which they have been designated in accordance with Article 63(1) or have those activities carried out by a subsidiary only with the agreement of their designating approval authority.

Where a technical service subcontracts specific tasks connected with the categories of activities for which it has been designated or has recourse to a subsidiary, it shall ensure that the subcontractor or the subsidiary meet the requirements set out in Article 61 and shall inform the designating approval authority accordingly.

Technical services shall take full responsibility for the tasks performed by any of their subcontractors or subsidiaries, wherever these are established.

Technical services shall keep at the disposal of the designating approval authority the relevant documents concerning the assessment of the qualifications of the subcontractor or the subsidiary and the tasks performed by them.