FTA

Answer

Fault Tree Analysis (FTA) is a top-down, deductive root-cause risk assessment method used in marine engineering and safety management to evaluate system failures.

• How it Works:
  1. Starts with a defined critical unwanted outcome called the "Top Event" (e.g., Main Engine Blackout, Boiler Explosion, or Steering Gear Failure).
  2. Works downward to identify all possible causes and combinations of lower-level component failures, environmental factors, or human errors that can trigger the Top Event.
• Logic Gates: It uses Boolean logic symbols to connect events:
  • AND Gate: The output event occurs only if all input events happen simultaneously (indicates redundancy).
  • OR Gate: The output event occurs if any single input event happens (indicates a single point of failure).
• Application on Ships: Used in risk assessments, accident investigations, safety system design (FMEA/FTA), and hazardous operations analysis (HAZOP) for complex machinery like gas carrier cargo systems or DP (Dynamic Positioning) vessels.