Definition
In risk assessment, a severity level describing a hazard whose consequences would be significant but not catastrophic — typically resulting in minor injury, minor system damage, or a notable degradation of mission capability that can still be managed.
Plain English
A risk level meaning the outcome would be bad but not disastrous — something that hurts performance or causes minor damage, but is recoverable.
Context Anchor
Seen when judging flight conditions, student performance, equipment condition, or overall risk before deciding whether to begin or continue a flight.
Derivation
From the Latin 'margo,' meaning 'edge' or 'border.' A marginal outcome sits at the edge — serious enough to matter, but not over the line into critical or catastrophic territory.
Why Pilots Care
Marginal conditions can deteriorate rapidly into hazards; recognizing them prompts extra caution or a decision to delay or cancel.
Intuition Check
Do not read marginal as simply bad or simply acceptable. In this context, it means close to the acceptable limit, with reduced room for error.
Example Sentence 1
The instructor rated the risk of light icing on the short cross-country as marginal and added a planned descent to warmer air as a mitigation.
Example Sentence 2
With the high density altitude, the instructor calculated that the available runway length was marginal for a safe takeoff.