A Certificate of Airworthiness (CdA) is the document that certifies that an aircraft is capable of performing flights under certain safety requirements. This document is issued by the national authority where the aircraft is registered.

Currently, there is no applicable fee when applying for Flight Authorization or Flight Conditions.

For any of the following:

A Flight Authorization is a document that certifies that the aircraft is capable of performing flights under certain safety requirements under the conditions determined in said authorization. This document is issued by the national authority where the aircraft is registered, or by an organisation with privileges granted by the Authority. The Flight Authorization will always have a certain validity.

Non-EASA aircraft are those aircraft excluded from EASA regulations according to Regulation 2018/1139 (EU) of the European Parliament and of the Council of 4 July. Among them are ultralight motorized aircraft called ULM, Historic, Experimental and Amateur Building Aircraft. Aircraft used in the use of military, patrol, police, etc. operations are also excluded from EASA regulations. For more details on which aircraft are excluded, see Regulation 2018/1139, in its Article 2.3(a) and Annex I.

There are currently no fees applicable for the declaratory renewal of the airworthiness certificate of an amateur-built aircraft.

This regime applies only to ULM aeroplanes of "Category A" as defined in Article 1(2) of Royal Decree 765/2022 of 20 September, which do not have novel or unusual design features, meaning those not covered by certification specifications or industry standards previously recognised through acceptable means of compliance by the competent body of EASA, and whose empty mass (excluding the ballistic parachute) does not exceed 120 kg and which are single-seater aeroplanes.

No, AESA will not reply or send you an acknowledgement of receipt of your declaration.
However, the owner or the person responsible for the maintenance and preservation of airworthiness must keep the proof of notification as evidence that the notification has been made.

Although it is not always mandatory when deferring a defect, a certifying technician must issue a CRS if a previous analysis has been required or a maintenance action has been carried out.

EASA Response "The original intent of the task-trained certification staff was to provide relief to certification personnel requirements for maintenance organizations that have multiple line maintenance stations away from the main base. 

This scenario was particularly adapted to Part-145, which is the type of organisation required for authorised air carriers (and CMPAs), which normally use such line stations. This is why points 66.A.20(a)(1) and 66.A.20(a)(3)(ii) (for task-trained CS) only refer to Part 145.