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NPA 2016-07

Regular update of CS-25

This Notice of Proposed Amendment (NPA) is based on the ‘systematic rulemaking projects’ concept introduced into the European Aviation Safety Agency’s Management Board Decision replacing Decision 01/2012 on the ‘Rulemaking Procedure’ (EASA MB Decision 18-2015 of 15 December 2015). This concept aims at improving the efficiency of the EASA rulemaking process.

The specific objective of this NPA is to propose an amendment to CS-25 following the selection of non-complex, non-controversial and mature subjects. The ultimate goal is to increase safety.

This NPA proposes to:

  • amend CS 25.1309 and AMC 25.1309 in order to clarify the provisions related to the exception of cabin safety equipment from CS 25.1309(b); and
  • amend AMC 25.1309 in order to reflect the current aircraft and systems development practices that make use of development assurance levels (DALs) assignments; the proposal introduces the relationship between the severity of a failure condition and the DAL.

The proposed changes are expected to contribute to updating CS-25 (Book 1 and Book 2) to reflect the available state of the art and facilitate the certification process. Overall, this would bring a moderate safety benefit, would have no social or environmental impacts, and may provide some minor economic benefits by streamlining the certification process.