Glossary — J

4 terms starting with J.

• jack-up rig
  Mobile offshore drilling or installation unit with retractable legs that are lowered to the seabed, lifting the hull clear of the water surface for operations.
• Jacking Gear
  A reduction-gear device coupled to the engine flywheel used to slowly turn the engine by hand or motor for inspection.
• Job Safety Analysis (JSA)
  Pre-task hazard identification process: list each step, identify hazards, define controls, and document.
• Junior Engineer
  Engine-room officer below 4/E rank, typically holding a partial CoC or completing on-board training; assists the watchkeeping engineer.