ARP 4754 DAL Assignment Online Training (AV-CERT-320)

Course overview

DAL assignment is one of the most consequential — and most debated — decisions on any program. AV-CERT-320 gives advanced, principle-based guidance on assigning Development Assurance Levels under ARP 4754, illustrated with worked examples.

The course addresses functional failure sets, independence, and the conditions under which DAL can be reduced, so you can make and defend assignments that authorities will accept.

What you will learn

• The general principles behind ARP 4754 DAL assignment
• How functional failure sets and independence affect assigned levels
• When and how DAL reduction is justified
• Worked examples that demonstrate the application of the principles
• How to document and defend DAL assignments to the authorities

Who should take this course

Experienced systems and safety engineers and certification leads responsible for justifying development assurance level assignments.

Recommended prerequisite: AV-CERT-210 — ARP 4754 Introduction & Planning

Course outline

1. DAL assignment principles — how ARP 4754 derives assurance levels from failure condition severity.
2. Functional failure sets — grouping functions whose combined failure defines the condition.
3. Independence and DAL reduction — when independent members of a failure set allow lower levels.
4. Worked examples — applying the principles to realistic architectures.
5. Defending the result — documenting assignments the authorities will accept.

How independence enables DAL reduction

Development Assurance Level assignment is where safety analysis meets architecture, and it is among the most consequential decisions on a program because it sets the cost of everything below it. The starting point is the severity of the failure condition, but ARP 4754 allows the assigned level to be reduced when a function is implemented by independent members of a functional failure set — the idea being that if no single failure, and no common cause, can produce the top condition, each contributing item can be assured to a lower level. This is how well-architected systems avoid assuring everything to Level A.

The catch is that the independence has to be real and demonstrated, not assumed — which is exactly what Common Cause Analysis exists to check. Assignments that claim reduction without substantiating independence are a frequent source of findings. This course works through the principles and realistic examples so you can both make defensible assignments and document the rationale an authority will accept.

What you will be able to do afterward

After AV-CERT-320 you will be able to apply ARP 4754 DAL-assignment principles, reason about functional failure sets and independence, justify DAL reduction where it is warranted, and document assignments that withstand review.

How this course fits your certification path

AV-CERT-320 builds on AV-CERT-210 and the safety analyses in AV-CERT-300. For a written primer, see our ARP 4754 explained guide. Prefer instructor-led? Explore our full ARP 4754 & 4761 training courses.

How on-demand training works

Every ConsuNova module is delivered online and self-paced, so you can learn on your own schedule. Each purchase includes 30-day access with unlimited views and downloads for one user, and a certificate of completion is issued automatically when you finish the module.

Your instructors

This module is authored and delivered by ConsuNova’s senior certification authorities, giving you both FAA and EASA perspectives on compliance:

Reza Madjidi FAA DER Consultant

Provides FAA Designated Engineering Representative expertise on U.S. avionics certification.

Martin Beeby EASA CVE Authorized

Brings EASA Certification Verification Engineer authority on European avionics compliance.

Frequently asked questions