Blog posts tagged in CS 25

Sofema Online (SOL) considers the role and differences related to Qualitative and Quantitative Analysis


Qualitative and quantitative analysis provides a comprehensive and robust understanding of the subject matter.

By combining both approaches, we can gain a more comprehensive understanding of the type, including its functional aspects, user experience, and performance metrics

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Sofema Online (SOL) considers the proposed action to improve aviation safety by making System Safety Assessment (SSA) Certification requirements more comprehensive and consistent.

Details of Proposed Change

The FAA proposes revised and new safety standards to reduce the likelihood of potentially catastrophic risks due to latent failures in critical systems.

>> The standards would require the elimination of such risks as far as practical. When it is not practical to eliminate such a risk, the standards would require the reduction and management of any remaining risk.
>> The proposed standards would also improve the likelihood that operators discover latent failures and address them before they become an unsafe condition, rather than discovering them after they occur and the FAA addressing them with airworthiness directives (ADs).

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Sofema Online (SOL) reviews the CS 25 system separation requirements.

Introduction EWIS Certification Requirements

(a) Each EWIS must be designed and installed with adequate physical separation from other EWIS and aeroplane systems so that an EWIS component failure will not create a hazardous condition.

>> Adequate physical separation must be achieved by separation distance or by a barrier that provides protection equivalent to that separation distance.

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Sofema Online (SOL) considers the relationship between Technical and Safety Requirements when designing aircraft system modifications.


Regulations by their nature are prescriptive conversely when we consider the potential exposure by referencing safety cases as part of the assessment process, we are substantially dealing with what could be considered a subjective approach.

Safety Analysis should add value rather than be simply a “Desktop” exercise.

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Posted by on in Regulatory

Sofema Online (SOL) Considers the process for managing Special Cabin Elements

Introduction - Role of the DOA Holder

>> Classify the changes
>> Approval of minor changes and repairs (Without EASA Involvement)

Examples of major changes for cabin safety include the following:

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Sofema Online (SOL) reviews key aspects of Cabin Certification Requirements.

Introduction - Reference the following requirement:

» Aisle widths must meet requirements set forth in CS 25.815

» Emergency exits must be accessible per CS 25.813

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Overview by Sofema Online (SOL)

H25.1 General - Ref CS 25.1529 and CS 25.1729.

• Each Aircraft ICAW Must Include Engine & Propeller (Identified as Products)
• For Each required Appliance including – interface
     » Must include ICAW
• Should consider AMC20-20 (Aging Structures)

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