Under EASA regulation aircraft owners are responsible for the continuing airworthiness of their aircraft. Owners must ensure that no flight takes place unless the aircraft is airworthy, the operational and emergency equipment fitted is correctly installed and serviceable, or is clearly identified as unserviceable, the Certificate of Airworthiness is valid, and the maintenance is performed in accordance with an approved AMP.
Only when the aircraft is leased, do the responsibilities of the owner transfer to the lessee.
Owners of what are known as complex motor-powered aircraft must ensure that tasks associated with continuing airworthiness are performed by a CAMO approved in accordance with Part-CAMO or Part-M.
When an owner is not a CAMO approved in accordance with Part-CAMO or Part-M, the owner shall ensure no flight takes place unless they have concluded a written contract with an organisation that is (Part-CAMO) or Subpart G (Part-M), approved, to ensure the performance of continuing airworthiness tasks is in accordance with the requirements.
Owners who are managing their own parked and stored aircraft must also ensure that any person authorised by the competent authority of the aircrafts state of registry is granted access to any of its facilities, aircraft or documents related to it as requested.
Controlled Environment (M.A.901)
In order to ensure the validity of the aircraft airworthiness certificate, M.A.901 requires a periodic airworthiness review of the aircraft and its continuing airworthiness records, which results in the issuance of an airworthiness review certificate valid for one year.
If the continuing airworthiness of the aircraft is not managed according to a continuing airworthiness arrangement, the aircraft should be considered to be outside of a controlled environment. Re-establishing the airworthiness of an aircraft or any of its installed engines and components, that has been outside of a controlled environment is a complex, time consuming and therefore costly exercise.