Which Category 2 operator aid is used specifically with luffing jibs?

• A. Boom angle or radius indicator
• B. Jib angle indicator
• C. Boom length indicator
• D. Outrigger position monitor

Answer: (B)

When a crane uses a luffing jib, the position of that jib—its angle relative to the crane—directly affects how far out the load reaches and how the load behaves in the air. The jib angle indicator provides real-time feedback on how high or low the jib is set and how far it reaches at that angle, which is crucial for keeping the load within the safe operating envelope and avoiding overloading or striking nearby objects. The other indicators serve different purposes: the boom angle or radius indicator shows the main boom’s position, not the luffing jib; the boom length indicator tracks the main boom length; and the outriggers position monitor ensures stable base deployment. Since controlling the luffing jib specifically requires knowing its angle, the jib angle indicator is the tool used for that purpose.