Developed by ICAO, the International Standards and Recommended Practices (SARPS) contained in the nineteen Technical Annexes to the Convention on International Civil Aviation (also called Chicago Convention) are applied universally and produce a high degree of technical uniformity which has enabled international civil aviation to develop in a safe, orderly and efficient manner. 

Airworthiness is the measure of an aircraft's suitability for safe flight.

A standard of airworthiness is initially demonstrated by a Certificate of Airworthiness from a national aviation authority, and remains valid by complying to the required Instructions For Continuing Airworthiness.

The application of airworthiness defines the condition of an aircraft and supplies the basis for judgement of the suitability for flight of that aircraft, in that it has been designed with engineering rigour, constructed, maintained and is expected to be operated to approved standards and limitations, by competent and approved individuals, who are acting as members of an approved organization and whose work is both certified as correct and accepted on behalf of the State.

The Primary document for airworthiness management information  is Registry Publication 9 (RP9).

Management of Airworthiness compliance  is the responsibility of the aircraft operator, who must appoint an individual in to the position of management, known as the Nominated Airworthiness Technical Representative (NATR).

The aircraft operator must inform the Aircraft Registry of their Nominated Airworthiness Technical Representative (NATR) who will manage the aircraft continuing airworthiness including the compilation of the requirements of the Maintenance Control Manual.

A specific contact who will be responsible for the airworthiness of the aircraft will be required.  (Please note this is NOT an IOMAR approved appointment).

This specific contact information is notified to the IOMAR on Form 20 Operator Declaration of Compliance & Delegated Authority Form.

(Further information on the role of Nominated Airworthiness Technical Representative (NATR) can also be found on Form 20.)

The Operator should, before submitting a completed Form 20  (Airworthiness Contact Information) be satisfied the nominated individual is experienced and competent to carry out the role of NATR, however the accountability of Aircraft Airworthiness is understood to remain with the Operator of the aircraft.

The NATR should be available to the IOMAR during the registration process, they should also provide the information required in Form 3 Application for a Certificate of Airworthiness, and also Form 100 Aircraft Maintenance Programme Approval Application.

The NATR will be the single point of contact for all matters of airworthiness for the Operator to the IOMAR.

Of specific importance is to identify the NATR must review all documents (work packs, tech log pages etc) that have a Certificate of Release to Service (CRS), within 30 days of receipt of the documents being returned from the Maintenance organisation or individual issuing the CRS . This is to ensure an accurate and therefore valid CRS has been made for.

IOMAR Senior Airworthiness Surveyors may contact the NATR on receipt of Form 20, to discuss the above information

Aircraft can only operate under 2 scenarios, either with a valid Certificate of Airworthiness (C of A) or a Permit to Fly (PtF).

To obtain the issuance of a C of A, the aircraft and its technical record documents will be presented, usually by your Nominated Airworthiness Technical Representative (NATR) to an appointed Isle of Man Aircraft Registry (IOMAR) Airworthiness Surveyor (AWS) for an airworthiness survey. 

Prior to requesting an airworthiness survey of the aircraft and its technical records, the Operator (NATR) must have completed their own inspection of the aircraft and records and satisfied themselves that they are in a position to demonstrate that each of the applicable items on this preparation document has reached a full level of compliance and when appropriate, providing documents if requested by the airworthiness surveyor. If there are any items about which you are unsure or cannot satisfy, please contact the Aircraft Registry or the assigned Surveyor in advance of the survey to discuss a possible resolution. 


The NATR will present the aircraft and it's technical records to the IOMAR Airworthiness Surveyor on a pre-arranged survey date and location. The survey is undertaken with the intention of making a recommendation for a C of A to be issued so that the aircraft may operate as soon as possible afterwards, assuming all operational requirements and approvals have been met.

For an initial survey the survey will follow the format of Registry Publication 7 Preparation Requirements for Certificate of Airworthiness (CoA) Initial Issue. To apply for an initial C of A survey please complete Form 3 Survey Application for the Initial Issue of a Certificate of Airworthiness (C of A).

A renewal survey will follow the format of Registry Publication 17 Preparation Requirements for Certificate of Airworthiness (C of A) Renewal Survey. To apply for a renewal C of A survey please complete Form 9 Survey Application for the Renewal Issue of a Certificate of Airworthiness (C of A).

For details of remote digital surveys that are being conducted due to COVID-19 please see our dedicated page here.

For a survey with no RP7 or RP17 findings, the Surveyor will submit a recommendation to the IOMAR that a standard has been achieved to issue a C of A. (Note - for initial C of A surveys IOMAR will confirm whether all registration requirements have been satisfied). At the conclusion of a satisfactory initial survey, the IOMAR will issue by email the Certificate of Airworthiness in digital format.

Generic Information

The digital certificates are rendered valid as the original documents in their digital form by IOMAR. They satisfy the on-board carriage requirements for aircraft engaged in international air navigation in accordance with Articles 29 and 31 of the Convention on International Civil Aviation as well as the requirements of Annex 7 and 8 to the same Convention.

The certificates may be carried using a portable electronic device (PED), or if the aircraft has approval, an Electronic Flight Bag (EFB)

Prior to your first flight you must have an Approved Maintenance Programme - guidance and instructions for this can be found within Registry Publication 9 Airworthiness Management Information, and is applied for by completing Form 100 Application for an Aircraft Maintenance Programme (AMP) Approval.

Upon satisfactory level of review, an Approved Maintenance Programme Certificate will be issued by the Registry.

Any subsequent changes to your Maintenance Programme must be detailed on Form 101 Change of Details of Aircraft Maintenance Programme Approval and submitted to the Registry.

The content of Form 100 / 101 and all documents cross referenced from it must be in compliance for the aircraft to be considered airworthy.

Modification and repair data provided by the Type Certificate Holder, Supplemental Type Certificate Holder or Design organisation and/or those approved under the regulations of the state of design, will be acceptable without further showing.  EASA Part 21 design data is also acceptable. 

If your modification falls outside of the groups above, then the NATR may apply for our modification approval using Form 35 Application for Approval of a Modification.