🔍 Key Concepts

• Fire door release mechanisms on SOLAS vessels • The effect of loss of control power on safety systems • Difference between a specific device and a general principle/method

💭 Think About

• Ask yourself: In a fire, what is most likely to fail first—power/control systems or mechanical devices—and how should a safety system respond? • Which option describes a general requirement that could apply to different designs, rather than locking you into one specific type of valve or sensor? • Look at which answers are focused on how heat is detected versus how the door is required to fail-safe when power is lost.

✅ Before You Answer

• Verify that fire doors on ships are designed to fail-safe on loss of power, not stay held open. • Check which options rely on a very specific component (hydraulic, pneumatic, spring) versus describing the functional requirement of the system. • Confirm that the release must occur in the event of a disruption of control system power or fire condition, so the door can close without human intervention.