Which device is used to hoist and lower the fly sections on an extension ladder?

Which device is used to hoist and lower the fly sections on an extension ladder?

• A. Halyard
• B. Rope
• C. Pulley
• D. Baseplate

Answer: (A)

The move-and-hold mechanism for extending the ladder is the halyard. This rope-and-pulley system attaches to the upper (fly) section and runs over a crown pulley at the top. When you pull the halyard, the upper section rises; as you control the rope and engage the locking pawls, the fly can be held at a desired height, and it can be lowered in a controlled manner by releasing or guiding the rope. The baseplate stays on the ground to stabilize the ladder and isn’t involved in lifting, while a plain rope or a single pulley alone doesn’t provide the complete, safe lifting and locking function needed for the fly sections.

The move-and-hold mechanism for extending the ladder is the halyard. This rope-and-pulley system attaches to the upper (fly) section and runs over a crown pulley at the top. When you pull the halyard, the upper section rises; as you control the rope and engage the locking pawls, the fly can be held at a desired height, and it can be lowered in a controlled manner by releasing or guiding the rope. The baseplate stays on the ground to stabilize the ladder and isn’t involved in lifting, while a plain rope or a single pulley alone doesn’t provide the complete, safe lifting and locking function needed for the fly sections.