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If an approved training organization (ATO) wishes to use "new" or additional aircraft for training purposes, these must be specified to the competent authority. They will be included in the list of aircraft operated for training (Annex 3 to the ATO certificate).
The necessary details and the documents to be submitted in the event of registration can be found on the form under "Forms".
If an aircraft is no longer used for training purposes, it must be deregistered. It will then be deleted from Appendix 3 to the ATO certificate.