Chainsaw Use and PPE Flashcards

A ground worker is using a chainsaw to cut small-diameter branches on a brush pile. The worker is wearing a helmet, safety glasses, and hearing protection, but is not wearing chainsaw chaps or pants. According to the ANSI Z133 standard, what is the correct assessment of this situation?

Answer: The worker must immediately stop work and put on appropriate leg protection before resuming any chainsaw use on the ground.

ANSI Z133 requires that cut-resistant leg protection be worn by all employees when operating a chainsaw on the ground. There are no exceptions based on the size of the wood being cut, the operator's experience level, or other saw safety features.

An arborist needs to start their chainsaw to begin work. According to ANSI Z133 safety standards, which of the following is a prohibited starting method?

Answer: Drop-starting the saw by holding it with one hand and pulling the starter cord with the other, without bracing it.

Drop-starting a chainsaw is explicitly prohibited by ANSI Z133. This method provides no stability or control over the saw during starting, creating a high risk of injury from the moving chain. The other methods described are recognized as stable and secure ways to start the saw.

A tree climber is operating a chainsaw aloft and experiences a sudden, violent upward and backward motion of the saw. This hazardous reactive force is known as kickback. Contact with which part of the guide bar is the primary cause of rotational kickback?

Answer: The top quadrant of the guide bar tip.

Rotational kickback, the most common and dangerous type, occurs when the moving chain in the upper quadrant of the guide bar tip (the "kickback zone") contacts an object. The chain can snag, momentarily stopping and transferring the rotational energy back to the operator, causing the saw to pivot rapidly upward and backward.

Which of the following pieces of personal protective equipment (PPE) is required by ANSI Z133 for an arborist operating a chainsaw aloft, but is NOT required for a ground worker operating a chainsaw?

Answer: A second point of attachment or work-positioning lanyard.

When working aloft, an arborist must have at least two means of being secured, such as a primary climbing line and a work-positioning lanyard. This is a critical component of the fall protection system specific to aerial work. While a helmet, eye protection, and leg protection are required for both ground and aerial chainsaw operators, the second point of attachment is uniquely required for working at height.

During a routine equipment inspection, a CTSP notices that a chainsaw's chain catcher—the small tab located beneath the guide bar—is broken off. What is the primary safety function of this component?

Answer: It intercepts and deflects a broken or derailed chain, preventing it from striking the operator.

The chain catcher is a critical safety feature designed to catch the chain if it breaks or derails from the guide bar. This action prevents the whipping chain from striking the operator's hand or body, which could cause a severe injury. The saw should be removed from service until the chain catcher is repaired or replaced.

When discussing mandatory PPE for ground-based chainsaw operations, safety professionals often refer to a "five-point" system. Which of the following items is a required component of this system according to ANSI Z133?

Answer: Hearing protection.

The ANSI Z133 standard requires the following PPE for chainsaw operators: head protection, eye protection, hearing protection, leg protection, and appropriate footwear. While cut-resistant gloves and high-visibility vests are often considered best practice and may be required by company policy or site conditions, hearing protection is one of the foundational requirements directly stipulated by the standard for chainsaw use due to high noise levels.