SMS Pro Aviation Safety Software Blog 4 Airlines & Airports

Relationship between a Hazard and Risk Occurrence in Safety Management

Posted by Tyler Britton on Jul 24, 2017 6:00:00 AM

Why Definitions of Hazard and Risk Matter

Relationship between hazard and risk occurrence

One of the most ubiquitous problems in aviation risk management is the misuse of words, in particular “hazard” and “risk.” Often, these two items are either:

  • Used interchangeably; or
  • Used much too broadly.

Accuracy is extremely important, as much of the bureaucracy in an aviation safety management system builds upon basic definitions of safety elements. Misunderstanding or assuming incorrect definitions can compromise how safety is accounted for and documented.

Having an accurate and correct understanding of hazard and risk are particularly important, as SMS programs around the globe build complex systems around these concepts. And make no mistake:

  • Hazard and risk are concepts that we can identify in actual operational environments.

The implication here is that with incorrect conceptual understanding, incorrect real-world identification is bound to follow.

Breaking Down Definition of a Hazard

A hazard is a concept that identifies:

  • A condition, such as an object, situation, circumstance, etc.;
  • A primary contributing factor to safety mishap; and
  • An identifiable state of being that poses threat.

For example, the Federal Aviation Administration (FAA) defines a hazard as, “A condition that could foreseeably cause or contribute to an aircraft accident…” (14 CFR § 5.5). These definitions and descriptions also tell us what a hazard is NOT:

  • Damages;
  • Safety mishap;
  • People; nor
  • Benign objects.

For example, a “building” is not a hazard because it poses no inherent operational threat (i.e., state of being). However, an “unlit building” or “tall building” may very well be hazards because a building in such a state could pose a threat that leads to an accident.

Such distinctions are extremely important in getting definition of hazard correct. When in doubt:

  • Be specific; and
  • Ensure that your identified hazard describes (with an adjective) a state of being that could be threatening (tall, dark, severe, complex, inadequate, damaged, etc.).

What Hazards Look Like in Operational Environment

What people forget is that, as said, hazards are a conceptual tool we use to identify a particular state of being in the operational environment. Let’s repeat: hazard definition is a tool! Like any tool, you should understand exactly what you are working with.

What countless safety managers fail to realize is that hazards are dynamic, not static. What does this mean?

  • A hazardous state of being requires many moving parts that, when combined, produce threat;
  • The events that proceed from a hazard do not “lead to mishaps” but “CAN lead to mishaps depending on the responses of the moving parts; and
  • The particular circumstances that produce a particular hazard will change over time as the operational environment changes (i.e., policy, technology, etc.).

The overall sense of dynamic that you need to understand is that the production of a hazard and every second that follows can be influenced for better or worse.

Breaking Down Definition of Risk (Two Types)

The concept of “Risk” is where things get confusing, as there are two definitions for risk depending on the context:

  • In general (i.e., “the risk of…”): The composite of predicted severity and likelihood of the potential effect of a hazard (14 CFR § 5.5); and
  • Specific risk (i.e., “a risk”): a safety mishap, accident, incident, damage, etc.

The key marker of a specific risk is damages. You can separate these damages from “consequences,” whereby damages are what happens and the consequences are the further ramifications of the damages.

Risk (in general) is generally documented with a risk matrix. Predicting risk involves:

  • The severity of most likely outcome – i.e., severity of most likely specific risk; and
  • The likelihood of the most likely outcome occurring – i.e., chances of most likely specific risk occurring.

Of course, there are many intermediary factors in between a hazardous state and risk occurrence. These intermediary factors will greatly affect whether or not the risk occurs.

Connection between Hazard and Risk

Now that we have established definitions and context for hazard and risk, it’s important to understand that, despite oversight agency guidance that indicates it, hazards do not result in risk occurrence automatically.

There are many other contributing factors that bridge the gap between hazards and risk occurrence, such as:

Hazards can result in risk occurrence fairly quickly or take a long time, depending on the above bullet points. Aviation SMS programs should focus much energy and time addressing the above points.

A hazard will have a very hard time resulting in risk occurrence given:

  • Quality risk controls;
  • Well trained personnel;
  • Strong aviation safety culture for reacting to exposure; and
  • Some luck.

Let’s not forget that there is an element of luck in risk avoidance. That being said, SMS programs that prepare employees and the operational environment well should be able to avoid many risk occurrences.

See this free resource below to test your or your employee's knowledge abotu hazards, risks, and risk controls.:

Download Free Hazard and Risk Assessment

Published July 2017. Last updated April 2019.

Topics: 2-Safety Risk Management

Site content provided by Northwest Data Solutions is meant for informational purposes only. Opinions presented here are not provided by any civil aviation authority or standards body.



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