Aerial Lift Operations Safety Flashcards

An arborist is operating an aerial lift to prune branches. They are secured to the designated anchor point with a short lanyard that prevents them from reaching the edge of the bucket. This type of fall protection is best described as:

Answer: Fall restraint

Fall restraint systems are configured to prevent an employee from reaching a position where a fall could occur. This is the primary method of fall protection required by ANSI Z133 for aerial lift buckets. A fall arrest system is designed to stop a fall in progress, which is not the primary strategy in a bucket. Work positioning systems are used by climbers in the tree, and suspension systems are for prolonged vertical work not typical of aerial lift operations.

According to ANSI Z133 safety standards, which of the following actions is strictly prohibited while operating an aerial lift for arboricultural operations?

Answer: Belting off to an adjacent tree or structure to gain more reach.

ANSI Z133 and OSHA standards explicitly prohibit belting off to an adjacent pole, structure, or tree while working from an aerial lift. The operator must always be secured to the engineered anchor point within the basket. This prevents being pulled from the basket if the adjacent anchor fails or if the boom moves unexpectedly.

During a pre-shift inspection of an aerial lift, which of the following checks is MOST critical for ensuring a means of rescue if the primary controls in the bucket fail or the operator is incapacitated?

Answer: Testing the emergency lowering system from the ground controls.

Testing the emergency lowering system (ground controls) is a critical daily inspection item. It ensures that ground personnel can safely lower the bucket and rescue the operator in an emergency, such as a medical issue, control malfunction, or hydraulic failure. While other inspections are important for overall safety, the emergency lowering system is a direct life-saving function.

An aerial lift operator, who is not a qualified line-clearance arborist, must maintain a specific minimum approach distance (MAD) from an energized distribution line rated at 35 kV. According to ANSI Z133, what is this MAD?

Answer: 10.7 feet

The ANSI Z133 standard provides a table of minimum approach distances for persons who are not qualified line-clearance arborists. For voltages in the range of 15.1 kV to 35.0 kV, the required MAD is 10.7 feet. It is critical for operators to know these specific distances to prevent electrocution.

A tree crew is setting up an aerial lift on a slight slope to access a tree. What is the most critical requirement for ensuring the stability of the unit before raising the boom?

Answer: Confirming the truck is leveled within the manufacturer's specified limits.

Aerial lifts have strict operational limits for working on a slope. The most critical step is to ensure the chassis is level to the degree specified by the manufacturer, often using outriggers and pads. Operating on a slope beyond these limits can shift the center of gravity and lead to a catastrophic tip-over, which is a leading cause of fatalities with this equipment. While brakes and chocks are important, they do not guarantee the unit is level.

While an arborist is aloft in an aerial lift, the ground crew's primary responsibilities include maintaining site security, operating the chipper, and what other critical safety function?

Answer: Observing the operator and surrounding area for changing conditions.

A key role of the ground crew is to act as a second set of eyes for the aerial lift operator. This includes watching for changing hazards like new pedestrian or vehicle traffic, unexpected weather, or hazards in the tree that the operator may not see from their position. This constant monitoring and communication is vital for preventing incidents.