Airworthiness Lifecycle: Design to Service
The EASA path from a type certificate and its data sheet to the certificate of airworthiness for one aircraft.
Dionysis Kefalas4 min readFor Part-21 and CAMO staff
Part 1 of 6 in EASA Part-21 Initial Airworthiness Show parts
Quotes checked on against EASA Easy Access Rules for Initial Airworthiness and Environmental Protection (Regulation (EU) No 748/2012, Part-21) — 27 Nov 2025 revision.
On this page
From a blank sheet to a flying aircraft
The certificate of airworthiness on one aircraft sits at the end of a longer trail: a type certificate for the design, the data that certificate carries, and then the certificate for that airframe. This guide walks that arc under Regulation (EU) No 748/2012, and points onward to the continuing-airworthiness guides.
Design and demonstrating compliance
A new aircraft, engine or propeller starts as a design measured against a type-certification basis. That basis is drawn from certification specifications, which are the subject of the next guide. How an applicant shows capability and compliance, and how the Agency issues the type certificate, is covered in Type Certification.
The type certificate, and everything that comes with it
When the design is approved, the type certificate is a package. This point lists what it includes.
The type-certificate and restricted type-certificate shall include the type design, the operating limitations, the instructions for continued airworthiness, the type-certificate data sheet for airworthiness and emissions, the applicable type-certification basis and environmental protection requirements with which the Agency records compliance, and any other conditions or limitations prescribed for the product, the UAS orthe CMU in the applicable certification specifications and environmental protection requirements. The aircraft type-certificate and restricted type-certificate shall include in addition the applicable operational suitability data certification basis, the operational suitability data and the type-certificate data sheet for noise. The aircraft type-certificate and restricted type-certificate data sheet shall include the record of CO2 emissions compliance, and the engine type-certificate data sheet shall include the record of exhaust emissions compliance.
Quoted word for word from Regulation (EU) No 748/2012, Easy Access Rules for Initial Airworthiness, 27 Nov 2025 revision.
The sentence includes the type design, the operating limitations, the instructions for continued airworthiness, and the type-certificate data sheet for airworthiness and emissions. For an aircraft type-certificate or restricted type-certificate, it also includes the operational suitability data and the type-certificate data sheet for noise. The library text still runs the words UAS orthe together. The quote keeps that spelling.
Making operational suitability data available
The holder of the type-certificate or restricted type-certificate shall make available:
(a)at least one set of complete operational suitability data prepared in accordance with the applicable operational suitability certification basis, to all known EU operators of the aircraft, before the operational suitability data must be used by a training organisation or an EU operator; and
(b)any change to the operational suitability data to all known EU operators of the aircraft; and
(c)on request, the relevant data referred to in points (a) and (b) above, to:
1.the competent authority responsible for verifying conformity with one or more elements of this set of operational suitability data; and
2.any person required to comply with one or more elements of this set of operational suitability data.
Quoted word for word from Regulation (EU) No 748/2012, Easy Access Rules for Initial Airworthiness, 27 Nov 2025 revision.
An operator's maintenance programme is not this point. It is covered in the aircraft maintenance programme guide.
From type design to an individual aircraft
A type certificate approves a design. It is not itself the certificate for one airframe. Who manufactures to that design is the production-organisation guide. This point is the procedure for the certificate of one aircraft.
This Subpart establishes the procedure for issuing airworthiness certificates to aircraft which conform to a type certificate that has been issued in accordance with this Annex.
Quoted word for word from Regulation (EU) No 748/2012, Easy Access Rules for Initial Airworthiness, 27 Nov 2025 revision.
The certificate of airworthiness goes to an aircraft that conforms to a type certificate issued under this Annex. The certificate and the permit to fly are the subject of their own guide.
Into service
After that individual certificate, the aircraft enters the continuing-airworthiness guides, starting with Airworthiness Reviews and the ARC.
Where to read it yourself
The initial-airworthiness rules quoted here are in Regulation (EU) No 748/2012, in the EASA Easy Access Rules for Initial Airworthiness and Environmental Protection. Every citation in this guide was checked against the 2025-11-27 revision. The companion guides go into certification specifications and ETSO, type certification, design and production organisations, certificates of airworthiness, and parts and the EASA Form 1.
Educational content, not regulatory compliance advice. Verify against the current regulation text before relying on it.
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Written by Dionysis Kefalas. Retired Hellenic Air Force Captain and founder of Avioverse. About the author
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