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Questions and Answers

In terms of the definition of what is a safety-critical system in an engineering context, which of the following is the best description?

A. The system is used to critically assess the safety of other systems.

B. There may be loss of life or serious injury.

C. There may be loss of life or serious injury, or significant damage to property or the environment (correct)

D. There may be significant damage to property or the environment.

In the context of safety-critical systems, which of the following statements is true about the role or nature of software?

A. The controller of the system should always be software.

B. Software is easier to model and test than hardware since software typically has fewer possible states.

C. Software can directly cause injury or loss of life.

D. Software does not deteriorate in the same predicable ways over time as hardware does (correct)

In safety-critical systems, why is redundancy considered a critical design feature?

A. It ensures system performance optimisation.

B. It guarantees faster system response times as there are more components working than you minimally need.

It provides a backup in case of system component failure. (correct)

t reduces the overall cost of the system as components identified as redundant can be removed in the design phase before the team has to pay the cost of implementation

In DO178-C, there are different levels of consequences that are used in conjunction with likelihoods to determine if a risk is acceptable. Which of the following statements is true?

<p>Critical consequences with a likelihood level of ’remote’ are tolerable if cost of mitigation would exceed improvement.</p> Signup and view all the answers

Study Notes

Safety-Critical Systems

Defined as systems where failure could result in loss of life, significant property damage, or environmental harm.
Examples include medical devices, automotive safety systems, and aerospace controls.

Role of Software in Safety-Critical Systems

Software plays a vital role in controlling system functions and ensuring safety.
Must adhere to strict reliability and safety standards to mitigate risks associated with software failures.

Importance of Redundancy

Redundancy enhances system reliability by providing backup components or systems.
Critical design feature helps ensure continuous operation even in the event of a failure.
Can include hardware, software, or process redundancy to address various failure scenarios.

DO-178C and Risk Acceptance

Different levels of consequences are used to evaluate the safety risks associated with software in aviation systems.
Risk is determined by assessing the likelihood of failure against potential severity of consequences.
An acceptable risk is one that falls within predefined thresholds stipulated by safety regulations.

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