Certification Specification 25 (CS 25) Training Course – 5 Days


Certification requirements for civil [commercial] aircraft are derived from ICAO Annex 8 Airworthiness of Aircraft together with ICAO Airworthiness Manual, Part V State of Design, and State of Manufacture. Each ICAO contracting state is obligated to establish its legal framework. Within the European Community this activity is undertaken by EASA essentially harmonised with the FAA.

EC Regulation 748/2012 provides Procedures for the certification of aeronautical products (aircraft, engines, and propellers). Known as EASA Part 21 regulations they include both procedures for design organization approval (DOA) (Sub-part J) and production organization approval (POA) (Sub-part G)

There are a series of technical codes that must be followed to ensure the design of the various products and parts are fully compliant with all certification requirements. Related to Large Aircraft this Technical Code is known as CS-25 Large Aeroplane Certification
The CS 25 Large Aircraft Certification training provides the delegates with a basic knowledge of the typical certification processes related to large airplanes.

The course reviews the regulatory background driven by ICAO, JAA, FAA, and EASA. Consideration is given to the technical aspects regarding systems and avionics, cabin and structure; and certification topics. The Intent of this course focuses on a needs-driven agenda rather than a line-by-line review of the various requirements.

What is the Benefit of this Training – What will I learn?

To achieve a basic understanding of Certification Specifications CS-25 together with an overview of the key fundamentals of Large Aeroplanes certification

To understand in detail the Certification Process related to Large Turbine Powered Aeroplanes

To be able to use the regulatory information to document and demonstrate compliance

To Understand the Safety Assessment Process Related to CS25-1309

Detailed Content / Topics – The following Subjects will be addressed

Day 1
Definitions & Abbreviations
Airworthiness System Considerations
EASA Part 21 Introduction
Design Aspects of Airworthiness
EASA Change Product Rule
EASA Part 21 Design Certification – Proportionality & Level of Involvement

Day 2
Introduction to Aircraft Certification Specification CS 25
CS25 Airworthiness Code (Certification Specification)
CS 25 – Safety Assessment CS25-1309
Flight Test Overview
Flight Manual & Supplements
Developing & Managing Instructions for Continued Airworthiness ICAW
CS 25 Appendix H — Instructions for Continued Airworthiness
Operational Suitability Data (OSD)
Subpart B – Flight
Structure General Introduction
• Introduction,
• Fatigue
• Damage Tolerant,
• Crashworthiness

Day 3
CS-25 Subpart C – Structure
Subpart D – Design and Construction
CS-25 Subpart F – Equipment
CS 25 Instrument & Electrical System Considerations
Review Guidance to Certify an Aircraft as PED Tolerant
CS-25 Subpart G – Operating Limitations and Information.
Enhanced Airworthiness Program for Aeroplanes Systems (EAPAS)
CS 25 Subpart H Electrical Wiring Interconnect Systems (EWIS)

Day 4
CS 25 Appdx R — HIRF environments and equipment HIRF test levels
EASA Part 21 Certification Process, Compliance Showing, Configuration Control
Classification of Changes
Type Certification Data Sheets & Type Certification Basis
Declaration of Design and Performance and Other Report Considerations

Day 5
Current Certification Issuers and Challenges
Cabin Refurbishment and LOPA Changes Considerations
Cabin Repair & Refurbishment Considerations and Certification Requirements
IFE & WiFi Installation and Certification Considerations
Aircraft Certification Crashworthiness and Survivability
Certification Specification 25 Equipment Standards – RTCA / EUROCAE
Guidelines for Development of Civil Aircraft and Systems ARP4754A
Certification and Approval Process EASA ETSO
Considering Other Standards such as SAE, MIL, etc.

Target groups 

The course is intended for personnel involved in the design of changes to TC, RTC, or STCs in the Design Organisation (DOA), or individuals intending to apply for minor changes. The course is also suitable for persons involved directly or indirectly with the System Safety Assessment process.


Familiarity with terminologies and concepts of design and initial airworthiness.

Learning Objectives 

To equip the delegates with a basic understanding related to the certification requirements for turbine-powered large airplanes. Additionally to understand how to demonstrate compliance with the certification specification.

Certificates Wording

EASA CS25 (Large Aircraft) familiarisation course incorporating the relevant aspects of Part 21 relating to Subpart J, the Application of Part 21 within the design and certification context, and the application of CS 25 in a showing of compliance (Subparts A, B, and C, D, F, G, and H)

What do People Say About Sofema Aviation Services Training?

“The instructor used the right words to explain the material.”
“The discussions among the group were very beneficial.”
“The instructor showed a very resourceful background and experience.”
“All sections of the course were related to my field.”
“Adequate answers were given to specific questions.”


5 days – Each Training day will start at 09.00 and finish at 17.00, with appropriate refreshment breaks.

To register for this training, please email team@sassofia.com or Call +359 28210806

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