SAE ARP 4761 Guidelines and Methods for Conducting the Safety Assessment Process in Civil Air Systems and Equipment

The SAE ARP 4761 standard, developed by the Society of Automotive Engineers (SAE), contains guidelines and methods for performing safety assessment for the certification of civil aircraft. This standard is specifically for demonstrating compliance with System design and analysis 25.1309-1A prepared under Federal Aviation Regulations.

The methods in this standard describe a systematic means of demonstrating conformity, but it is not the only instrument. The standard also focuses on aircraft level safety assessment and outlines the means to accomplish this task. In general, the aircraft operating environment is taken into account. Once aircraft variants or system changes are approved, the processes described here are generally only applicable to new designs or existing designs affected by the changes. Where existing designs are implemented in a new derivative, alternative means such as service experience are used to demonstrate suitability.

The standard in question is a recommended application of SAE International for aerospace. This standard is used in conjunction with the SAE ARP 4754 standard to demonstrate compliance with the US Federal Aviation Administration airworthiness regulations, CFR 25.1309, as well as international airworthiness regulations harmonized by the European Aviation Safety Agency, for transport category airplanes.

Recommended practice in the SAE ARP 4761 standard describes a process for using common modeling techniques to evaluate the security of an assembled system. It also provides an overview of modeling techniques and how they should be applied. An example of the process in action is given at the end of the standard.

In general, the general flow of the security lifecycle under this standard is as follows:

• Carrying out an aircraft level functional hazard assessment in parallel with the development of aircraft level requirements.
• Perform system level functional hazard assessment and initiate common cause analysis in parallel with the allocation of aircraft functions to system functions.
• Performing the preliminary system security assessment in parallel with the system architecture and updating the common cause analysis.
• Repetition of common cause analysis and preliminary system security assessment as the system is allocated to hardware and software components.
• System security assessmentThe execution of the system in parallel with the system implementation and the completion of the common cause analysis.

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