Significant Standards Difference (SSD) are an integral part of the EASA certification basis for validation. EASA SSDs refer to EASA airworthiness standards that either differ significantly from the FAA standards or have no FAA equivalent, as defined in EASA/FAA TIP Rev. 6 §3.5.13.
For pairs of EASA/FAA airworthiness codes applicable to a project for which there is no published SSDs list, the Agency shall be consulted to get the adequate list of SSDs.
The below table reflects the EASA Significant Standards Differences (SSD) for Airworthiness.
| Category | Comments |
| Large Aeroplanes |
The following SSDs lists include only specifications where compliance with the FAR minimum standards would not be sufficient to comply with the EASA CS-25. These lists are intended for EASA validations of FAA products. For Regulatory Differences CS-25 Amendment 12 vs. 14 CFR Part 25 Amendment 1 through 136 LINK For Regulatory Differences CS-25 Amendment 13 vs. 14 CFR Part 25 Amendment 1 through 136 LINK For Regulatory Differences CS-25 Amendment 13 vs. 14 CFR Part 25 Amendment 1 through 137 LINK For Regulatory Differences CS-25 Amendment 14 vs. 14 CFR Part 25 Amendment 1 through 137 LINK For Regulatory Differences CS-25 Amendment 14 vs. 14 CFR Part 25 Amendment 1 through 138 LINK For Regulatory Differences CS-25 Amendment 15 vs. 14 CFR Part 25 Amendment 1 through 138 LINK For Regulatory Differences CS-25 Amendment 15 vs. 14 CFR Part 25 Amendment 1 through 139 LINK For Regulatory Differences CS-25 Amendment 15 vs. 14 CFR Part 25 Amendment 1 through 140 LINK For Regulatory Differences CS-25 Amendment 15 vs. 14 CFR Part 25 Amendment 1 through 141 LINK For Regulatory Differences CS-25 Amendment 16 vs. 14 CFR Part 25 Amendment 1 through 141 LINK For Regulatory Differences CS-25 Amendment 17 vs. 14 CFR Part 25 Amendment 1 through 141 LINK For Regulatory Differences CS-25 Amendment 17 vs. 14 CFR Part 25 Amendment 1 through 142 LINK For Regulatory Differences CS-25 Amendment 18 vs. 14 CFR Part 25 Amendment 1 through 142 LINK For Regulatory Differences CS-25 Amendment 18 vs. 14 CFR Part 25 Amendment 1 through 143 LINK For Regulatory Differences CS-25 Amendment 18 vs. 14 CFR Part 25 Amendment 1 through 144 LINK |
| General Aviation | This SSDs list includes only specifications where compliance with the FAR minimum standard would not be sufficient to comply with the EASA CS-23. This list is intended for EASA validations of FAA products: LINK |
| This SSDs list includes only specifications where compliance with the FAR minimum standard would not be sufficient to comply with the CS-31GB/HB/TGB . This list is intended for EASA validations of FAA products: LINK | |
| Rotorcraft | SSDs list for Rotorcraft is presented in the EASA Combined SSD and SEI List for CS 27 and CS 29 Rotorcraft: LINK |
| Propulsion |
For Turbine Engines and Piston Engines, EASA CM-PIFS-008 Issue 01 provides Regulatory Differences between CS-E and CFR 14 Part 33 (for validation by EASA of FAA certified engine types). It addresses CS-E Initial Issue through Amendment 3 vs. 14 CFR Part 33 Amendment 20 through 33.: LINK For Regulatory Differences CS-E Amendment 4 vs. 14 CFR Part 33 Amendment 34: LINK For Regulatory Differences CS-E Amendment 5 vs. 14 CFR Part 33 Amendment 34: LINK |
The below table reflects the EASA Significant Standards Differences (SSD) for Environmental Certification.
| Category | Comments |
| Aircraft Engine Emissions and Fuel Venting |
For Regulatory Differences CS-34 Amendment 3 vs. 14 CFR Part 34 Amendment 5A: LINK For Regulatory Differences CS-34 Amendment 3 vs. 14 CFR Part 34 Amendment 6: LINK For Regulatory Differences CS-34 Amendment 4 vs. 14 CFR Part 34 Amendment 6: LINK |