The technological developments of the last years showed that the degree of hybridization highly depends on the intended use of the aircraft, the selected fuel/power supply, suitable power storage solutions and the required safety objectives equivalent to traditional propulsion. The special condition E19 on EHPS addresses a variety of EHPS architectures and demonstrate a level of flexibility to enable technical innovation with adequate airworthiness standards for such product certification. Between the performance-based rule and the standards under development, it was found essential to develop dedicated Means of Compliance suitable to address a variety of possible EHPS architectures. Industry required more guidance to secure their designs and standardization groups must be comforted in their priorities. The established gap analysis in the propulsion domain helped identifying the guidance material available and the ones to be developed in priority based on mature design applications (Priority1).
EASA adopted a 3-level approach for MOC development and better structuring of the existing material et definition of the necessary development.
- Level 1, the « a la carte » is a tool allowing applicants to select their design specificities and obtain a set of comprehensive means of compliance composed of level 2 and level 3 guidance (under development);
- Level 2 is the Means of Compliance guidance equivalent to the Certification Specification book 2, provide direct guidance material or / and explain how to articulate level 3 documents (standards and existing guidance materials) as acceptable methods of compliance; and
- Level 3 is gathering methods of compliance, namely industry standards, existing guidance material or certification memorandum.
As highlighted by the above the means of compliance development strongly relies on Industry standards as a core element of the strategy to address new technology guidance, going beyond of the existing guidance material.
The page was created to publish the SC E-19 which supports Applications received by the Agency for the certification of Electric and / or Hybrid Propulsion Systems powered by propulsion batteries and / or fuel.
The page is now updated to include the level 2 means of compliance associated to the SC E-19 and relevant to EASA defined priority 1 for consultation. The priority 1 MOC address the core design of EHPS mature design application essentially focused on electric engine. Any design specificities will be addressed based on technology maturation and readiness.
Official comments to the proposed Means of Compliance (MOC) to the SC are to be filed through the EASA Comment-Response Tool (CRT). You can view the related MoC consultation pages below:
NB The MoC to 'Safety Assessment' are planned to be also published for consultation in 2025/Q1 or 2025/Q2.
