Question 4432 Deck General

The correct answer is D) jack up first, then down. When operating a liftboat, it is crucial to follow proper jacking procedures to ensure the stability and safety of the vessel. The correct sequence is to first jack up the liftboat, and then jack down. This ensures that the vessel is securely elevated before lowering the legs, preventing potential instability or tipping. Jacking down one leg at a time (option A) could compromise the vessel's stability, while jacking down without first jacking up (option D) would be an unsafe practice. Undog doors to the engine room (option B) and assembling personnel on the main deck (option C) are not directly related to the jacking procedure and are not the correct steps to take when beginning to jack down a liftboat.