On the illustrated fire control plan of the lower engine room, the arrow between frames 135 and 140 represents what? Illustration SF-0046

Correct Answer: Option B — Primary means of escape

In accordance with standard IMO and USCG fire control plan symbology, the arrow depicted between frames 135 and 140 on the lower engine room plan indicates the primary means of escape. This route must be kept clear of obstructions to ensure safe egress for personnel during emergencies.