A vibration described as MODERATE would be described as which of the following in terms of impact?

• A. No noticeable effect
• B. Major safety risk
• C. Noticeable but not affecting work
• D. Severe hazard

Answer: (C)

Moderate vibration means you can notice it, but it does not prevent you from performing the task or pose a safety risk. In this impact scale, that sits at the level where the effect is perceptible to the crew but work can continue normally. You might feel it in your hands, arms, or seat and perhaps make a small adjustment, but it won’t impair operation or safety. The other extremes are when there’s no noticeable effect (too mild to matter) or when the vibration constitutes a major safety risk or severe hazard (significantly affecting safety or performance).