Who can issue a Permit to Fly?
In accordance with Part21A.711, the competent authority of the member state of registry is normally responsible for the issue of a Permit to Fly. Appropriately approved design or production or continuing airworthiness management organisations may also issue a Permit to Fly within limitations specified in Part 21.
When do I need a Permit to Fly?
When my aircraft does not meet, or has shown not to have met, applicable airworthiness requirements and as a result does not hold a valid certificate of airworthiness or restricted certificate of airworthiness, but is capable of a safe flight under defined conditions and for the purposes listed on point 4.2 of Form 37.
Note that the member State of Registry can also grant an exemption to allow an aircraft to fly without a valid C of A or R-C of A under the provisions of article 14.4 of the Basic Regulation if it finds that the conditions of this article are met.