ATB EASA Modules are in a constant state of review regarding quality, regulatory updates, and new technologies. We identify 3 types of updates and/or revisions.
To receive a notification when any of these types of revisions occur, please Join Our Mailing List at the bottom of this page.

Minor Revisions

Identified by a decimal to the edition number.
Example: 001 becomes 001.1

A clarification or small change typically encompasses a few pages. Pages with minor revisions are provided below for you to download and/or print. These updates will remain available for 2 years from cited publication date. Please subscribe to our mailing list to be notified when these revisions occur.

Regulatory Updates

Identified by a whole number edition.
Example: 002 becomes 003

A revision dictated by an EASA rule change.

Part 147 Students: Your instructor will be notified of this update and arrangements will be made through your school to provide affected students with an eBook replacement module.
Non-Part 147 Students: A notice will be sent to all mailing list subscribers. If your purchase was within two years of the regulatory change, you may request a coupon for an eBook replacement within two weeks of the new version publication date.

New Editons

Identified by a whole number edition.
Example: 004 becomes 005

A Module or Submodule rewrite not required by regulation, like technology enhancements. The previous edition remains valid and within all regulatory guidelines. An email notification will be sent describing this update along with an opportunity to purchase the new version.

Measurement Standards are being integrated into all EASA titles. We are offering it now until we have all the titles updated.

EASA Module Revision Logs And Updates

CAT-A Revision Logs

Module 1. Mathematics

Version	Effective Date	Description of Change
001	2016 01	Module Creation and Release
002	2020 02	Module Updates - Layout Adjustments Download Supplement PDF

Module 2. Physics

Version	Effective Date	Description of Change
001	2013 12	Module Creation and Release
002	2020 02	Minor Appearance Updates
002.1	2020 05	Clarified formulas for Buoyant Force (page 2.7) and Vibration (page 2.11)
002.2	2020 05	Corrected formulas for Pendular Movement and Vibration. Sub-Module 02, page 2.11
002.3	2022 06	Clarified number of electrons in orbital shells. Sub-Module 01, page 1.2-1.3 Download Supplement PDF

Module 3. Electrical Fundamentals

Version	Effective Date	Description of Change
001	2014 08	Module Creation and Release
002	2019 04	Fine tuned Sub-Module content sequence based on Appendix-A. Updated layout and styling.

Module 5. Digital Techniques/Electronic Instrument Systems

Version	Effective Date	Description of Change
001	2014 09	Module Creation and Release
002	2019 05	Fine tuned Sub-Module content sequence based on Appendix-A. Updated layout and styling.
002.1	2021 09	Added enhanced Welcome, Forward, EASA License and General Knowledge Requirements. No content changes.

Module 6. Materials And Hardware

Version	Effective Date	Description of Change
001	2019 01	Module Creation and Release

Module 7A. Maintenance Practices

Version	Effective Date	Description of Change
001	2020 02	Module Creation and Release
001.1	2021 10	Corrected description of file types (Sub-Module 07, pages 3.15-3.16) Download Supplement PDF

Module 8. Basic Aerodynamics

Version	Effective Date	Description of Change
001	2018 06	Module Creation and Release

Module 9A. Human Factors

Version	Effective Date	Description of Change
001	2018 11	Module Creation and Release

Module 10. Aviation Legislation

Version	Effective Date	Description of Change
001	2020 03	Module Creation and Release
002	2020 10	Enhanced or modified content within the following Sub-Modules: 10.4: Complete rewrite for updated regulations. 10.6: Complete rewrite for updated regulations.

Module 11A. Turbine Aeroplane Aerodynamics, Structures And Systems

Version	Effective Date	Description of Change
001	2020 04	Module Creation and Release

Module 11B. Piston Aeroplane Aerodynamics, Structures And Systems

Version	Effective Date	Description of Change
1	2017 08	Release (TEC Textbook)

Module 12. Helicopter Aerodynamics, Structures And Systems

Version	Effective Date	Description of Change
1	2016 03	Release (TEC Textbook)

Module 15. Gas Turbine Engine

Version	Effective Date	Description of Change
001	2019 01	Module Creation and Release

Module 16. Piston Engine

Version	Effective Date	Description of Change
001	2019 04	Module Creation and Release
002	2017 02	Format Update
003	2020 06	Realignment to Part-66 Appendicies. Enhanced figures throughout entire textbook.
004	2023 01	Major rewrite and fomatting updates. Acronym updates and inclusion of Measurement Standards page.

Module 17A. Propeller

Version	Effective Date	Description of Change
001	2016 02	Module Creation and Release
002	2019 11	Minor Format Updates

EASA B1 Revision Logs

Module 1. Mathematics

Version	Effective Date	Description of Change
001	2016 01	Module Creation and Release
002	2017 05	Format Update and Minor Corrections
002.1	2019 07	Added "Solving Word Problems" to end of Sub-Module 02.
002.2	2020 10	Style and Layout updates.

Module 2. Physics

Version	Effective Date	Description of Change
001	2013 12	Module Creation and Release
002	2016 11	Format Update and Apprearance Update
003	2018 07	Refined content sequencing to Appendix 1.
003.1	2020 05	Clarified formulas for Buoyant Force – Sub‑Module 02.
003.2	2021 05	Corrected formulas for Pendular Movement and Vibration. Sub-Module 02, Page 2.11
003.3	2022 06	Clarified number of electrons in orbital shells. Sub-Module 01, pages 1.2-1.3 Download Supplement PDF

Module 3. Electrical Fundamentals

Version	Effective Date	Description of Change
001	2014 08	Module Creation and Release
002	2016 10	Format Updates
003	2017 03	Content Updates and Subject Clarification
004	2019 07	Fine tuned Sub-Module content sequence based on Appendix-A. Updated layout and styling.
004.1	2020 06	Page 14.5 and 14.7 - Corrected equations on parallel AC circuits and resonance.

Module 4. Electronic Fundamentals

Version	Effective Date	Description of Change
001	2016 01	Module Creation and Release
002	2016 05	Minor Corrections/Layout Adjustments
003	2018 07	Adjusted content for alignment to Part 66, Appendix 1. Added Static Electricity Protection to Sub-Module 02; Remove Logic Circuits from Sub-Module 1.2; other minor corrections.
003.1	2022 06	Clarified number of electrons in orbital shells. Sub-Module 01, page 1.2. Download Supplement PDF

Module 5. Digital Techniques/Electronic Instrument Systems

Version	Effective Date	Description of Change
001	2016 01	Module Creation and Release
002	2017 03	Format Update/Minor Type Corrections
002.1	2021 05	Formatting Updates - No Content Changes

Module 6. Materials And Hardware

Version	Effective Date	Description of Change
001	2013 01	Module Creation and Release
002	2014 07	Format Update/Minor Corrections
003	2018 07	Modified sub-module sequence in accordance to Appendix A. Added content in the following areas: 6.3: Thixotropic agents; Wood preservation methods; Types of fabric defects. 6.4: Stress corrosion; Exfoliated corrosion detection; Galvanic corrosion growth; Fretting corrosion. 6.5: Screw threads; Dowels. 6.6: Rigid fluid line sizes; Swaged fittings. 6.7: Laws obeyed by springs. 6.8: Bearing material and construction. 6.11: Connector types, Identification codes, and ratings.

Module 7A. Maintenance Practices

Version	Effective Date	Description of Change
001	2016 01	Module Creation and Release
002	2016 08	Module Revisions
003	2019 10	Refined content sequencing to Appendix 1. The following content was added for clarity: 7.1: International Fire Classification 7.2: Tool Care 7.6: Accuracy of Drilled Holes; Formula for Determining Bow 7.8: Cleco Fasteners 7.11: Types of Lubricants 7.13: Bowden Cables 7.14: Composite Bonding; Ultrasonic Inspection 7.16: Example Mass And Balance Computations 7.17: Storage Methods 7.18: Rewrite of Non‑destructive Testing Methods 7.19: Heavy Landing Inspection Checklist
003.1	2021 10	Corrected description of file types (Sub-Module 07, pages 3.15-3.16) Download Supplement PDF

Module 8. Basic Aerodynamics

Version	Effective Date	Description of Change
001	2015 01	Module Creation and Release
002	2016 07	Format Update and Minor Content Revisions
003	2018 07	Refined content sequencing to Appendix 1. The following content was added for clarity: 8.2: Free Stream Air Flow, Wash-In/Wash-Out 8.3: Steady State Flight; High Speed Aerodynamics; Helicopter Aerodynamics 8.4: Passive and Active Stability

Module 9A. Human Factors

Version	Effective Date	Description of Change
001	2015 01	Module Creation and Release
002	2018 10	Typographic and Layout Updates – No Content Change

Module 10. Aviation Legislation

Version	Effective Date	Description of Change
001	2014 02	Module Creation and Release
002	2017 05	Format Update/Addition of Part-T, Sub-Module 06.
003	2019 08	Updated to current regulations, and reduction of Sub-Module 04 to appropriate level 1 requirements.
004	2020 10	Enhanced or modified content within the following Sub-Modules: 10.1: Updated to current regulations EU 2018/1139 and 376/2014 10.2: Definitions section added 10.3: Definitions section added 10.4: Complete rewrite for updated regulations 10.5: Definitions section added 10.6: Complete rewrite for updated regulations 10.7: Definitions section added
004.1	2021 04	10.3: Corrected answer to question 3-2 from 2 to 3. Download Supplement PDF

Module 11A. Turbine Aeroplane Aerodynamics, Structures And Systems

Version	Effective Date	Description of Change
001	2015 10	Module Creation and Release
002	2016 01	Minor Revisions
003	2017 09	Format Update
003.1	2019 02	Added section on Pneumatic and Pressure Pumps in Sub-Module 16.
003.2	2019 05	Corrected incorrect answers in Sub-Module 20.
004	2019 12	Typographic format updated; Sequencing of content to Appendix 1 refined. Enhanced or modified content within the following Sub-Modules: 11.2: Bonding Procedures, NACA Scoops 11.3: Flight Control Surfaces, Image of A330 emergency slide image of turbine nacelle 11.7: Images of interior paneling and cargo container added for clarity 11.19: Common Core Systems 11.20: IFE Systems and Servers 11.21: Airbus Information System Architecture
004.1	2021 04	Enhanced content of M11A Sub-Module 08(b).
004.2	2023 01	Added Measurement Standards. Improved Figures 13-51, 18-5, and 18-6. Download Supplement PDF

Module 12. Helicopter Aerodynamics, Structures And Systems

Version	Effective Date	Description of Change
001	2022 03	Module Creation and Release
001.1	2022 03	Label Correction for Figure 2-1; Page 2.2 Download Supplement PDF
001.2	2022 10	Inclusion of Measurement Standards for clarificaton, page iv. Enhanced or modified content within the following Sub-Modules: 12.9(A): Moved content on emergency escape lighting from page 9.14 to 9.5. 12.13: Expanded content on Wiper Systems. 12.14: Expanded content on Emergency Pop-out Floats. 12.19: Added section; Miscellaneous Information Systems. Download Supplement PDF
002.1	2023 01	Minor type corrections and Figure replacement. Replaced Figures 14-54 on page 14.30, Figure 15-9 on page 15.5, and Figure 18-4 and 18-5 on page 18.5. Download Supplement PDF

Module 15. Gas Turbine Engine

Version	Effective Date	Description of Change
001	2016 01	Module Creation and Release
002	2016 08	Module Revisions
003	2017 11	Format Updates
004	2019 01	Fine tuned Sub-Module content sequence based on Appendix-A. Updated layout and styling. Enhanced or modified content within the following Sub-Modules: 15.1: Definition of Energy; Constructional Arrangements 15.2: Operating Principles; EPR Measurement, Engine Ratings 15.3: Ice Protection 15.4: Air Flow Control; Compressor Ratio 15.5: Operation of Combustion Chambers 15.6: Turbine Blade Operation 15.9: Spectrometric Oil Analysis 15.12: Turbine Engine Cooling; Bearing Chamber Seal; Anti-icing 15.13: Starter System Safety 15.14: Fuel Flow Indication 15.15: Operation and Application; Afterburner Systems 15.16: Reduction Gears; Engine Control; Overspeed Devices 15.17: Drive Systems 15.19: Cowling C-ducts; Control Cables 15.21: Health and Trend Monitoring; FOD 15.22: Fuel System Preservation
004.1	2022 06	Inclusion of Measurement Standards for clarificaton, page iv. Download Supplement PDF

Module 16. Piston Engine

Version	Effective Date	Description of Change
001	2016 01	Module Creation and Release
002	2017 02	Format Update
003	2020 06	Realignment to Part-66 Appendices. Enhanced figures throughout entire textbook.
003.1	2023 01	Revised Acronym Index on page A1, added Measurement Standards on iv. Download Supplement PDF

Module 17A. Propeller

Version	Effective Date	Description of Change
001	2016 01	Module Creation and Release
002	2019 10	Minor Format Updates

EASA B2 Revision Logs

Module 1. Mathematics

Version	Effective Date	Description of Change
001	2016 01	Module Creation and Release
002	2017 05	Format Update and Minor Corrections
002.1	2019 07	Added "Solving Word Problems" to end of Sub-Module 02.
002.2	2020 10	Style and Layout updates.

Module 2. Physics

Version	Effective Date	Description of Change
001	2018 12	Module Creation and Release
002	2020 05	Clarified formulas for Buoyant Force (page 2.7) and Vibration (page 2.11)
002.1	2021 05	Corrected formulas for Pendular Movement and Vibration. Sub-Module 02, page 2.11 and page 2.12.
002.2	2022 06	Clarified number of electrons in orbital shells. Sub-Module 01, pages 1.2-1.3 Download Supplement PDF

Module 3. Electrical Fundamentals

Version	Effective Date	Description of Change
001	2014 08	Module Creation and Release
002	2016 10	Format Updates
003	2017 03	Content Updates and Subject Clarification
004	2019 07	Fine tuned Sub-Module content sequence based on Appendix-A. Updated layout and styling.
004.1	2020 06	Page 14.5 and 14.7 - Corrected equations on parallel AC circuits and resonance.

Module 4. Electronic Fundamentals

Version	Effective Date	Description of Change
001	2016 01	Module Creation and Release
002	2019 10	Format Update
002.1	2022 06	Clarified number of electrons in orbital shells. Sub-Module 01, page 1.4 Download Supplement PDF

Module 5. Digital Techniques/Electronic Instrument Systems

Version	Effective Date	Description of Change
001	2015 01	Module Creation and Release
002	2017 02	Format Update
002.1	2019 11	Corrections to Figures: 3-5, 5-14, 8-4, 9-4.
002.2	2022 06	Addition of Measurement Standards and minor formatting updates. Download Supplement PDF

Module 6. Materials And Hardware

Version	Effective Date	Description of Change
001	2018 08	Module Creation and Release

Module 7A. Maintenance Practices

Version	Effective Date	Description of Change
001	2020 03	Module Creation and Release
001.1	2021 04	Enhanced Sub-Module 04; IFR 4000 and 6000 test equipment.
001.2	2021 10	Corrected description of file types (Sub-Module 07, pages 3.15-3.16) Download Supplement PDF

Module 8. Basic Aerodynamics

Version	Effective Date	Description of Change
001	2015 01	Module Creation and Release
002	2016 07	Format Update and Minor Content Revisions
003	2018 07	Refined content sequencing to Appendix 1. The following content was added for clarity: 8.2: Free Stream Air Flow, Wash-In/Wash-Out 8.3: Steady State Flight; High Speed Aerodynamics; Helicopter Aerodynamics 8.4: Passive and Active Stability

Module 9A. Human Factors

Version	Effective Date	Description of Change
001	2015 01	Module Creation and Release
002	2018 10	Typographic and Layout Updates – No Content Change

Module 10. Aviation Legislation

Version	Effective Date	Description of Change
001	2014 02	Module Creation and Release
002	2017 05	Format Update/Addition of Part-T, Sub-Module 06.
003	2019 08	Updated to current regulations, and reduction of Sub-Module 04 to appropriate level 1 requirements.
004	2020 10	Enhanced or modified content within the following Sub-Modules: 10.1: Updated to current regulations EU 2018/1139 and 376/2014 10.2: Definitions section added 10.3: Definitions section added 10.4: Complete rewrite for updated regulations 10.5: Definitions section added 10.6: Complete rewrite for updated regulations 10.7: Definitions section added
004.1	2021 04	10.3: Corrected answer to question 3-2 from 2 to 3. Download Supplement PDF

Module 11A. Turbine Aeroplane Aerodynamics, Structures And Systems

Version	Effective Date	Description of Change
001	2015 10	Module Creation and Release
002	2016 01	Minor Revisions
003	2017 09	Format Update
003.1	2019 02	Added section on Pneumatic and Pressure Pumps in Sub-Module 16.
003.2	2019 05	Corrected incorrect answers in Sub-Module 20.
004	2019 12	Typographic format updated; Sequencing of content to Appendix 1 refined. Enhanced or modified content within the following Sub-Modules: 11.2: Bonding Procedures, NACA Scoops 11.3: Flight Control Surfaces, Image of A330 emergency slide image of turbine nacelle 11.7: Images of interior paneling and cargo container added for clarity 11.19: Common Core Systems 11.20: IFE Systems and Servers 11.21: Airbus Information System Architecture
004.1	2021 04	Enhanced content of M11A Sub-Module 08(b).

Module 12. Helicopter Aerodynamics, Structures And Systems

Version	Effective Date	Description of Change
001	N/A	No plans for creation at this time.

Module 13. Aircraft Aerodynamics, Structures And Systems

Version	Effective Date	Description of Change
001	2016 01	Module Creation and Release
002	2017 02	Format Update
003	2017 08	Module 03 Revisions. Typo corrections in Sub-Modules 03, 04 and 08.
004	2020 02	Enhanced or modified content within the following Sub-Modules: 13.3: Added Autopilot Modes of Operation. 13.4: Reorganized based on Part‑66 2018 changes; added content: ADS-B and Datalink; Corrected Figures 4-78 and 4-79. 13.7: Added Fly-By-Wire Failsafe and Fly-By-Wire operation.
004.1	2021 04	Enhanced or modified content within the following Sub-Modules: 13.4: Corrected 150 Mhz to 150 Hz (page 4.46). 13.8: Corrected Figure 8-12; Engine Pressure Ratio (EPR). Corrected 14.7 psi to 14.5 psi.
004.2	2022 10	Inclusion of Measurement Standards for clarificaton, page iv. Download Supplement PDF

Module 14. Propulsion

Version	Effective Date	Description of Change
001	2016 02	Module Creation and Release
002	2017 11	Module Revisions
003	2019 04	Fine tuned Sub-Module content sequence based on Appendix-A. Updated layout and styling.