Because of the severe risks, regulatory agencies like OSHA in the US and the CCOHS in Canada strictly enforce training requirements based on ANSI A92 and CSA B354 standards. Before an operator ever elevates a platform, they must master the most critical element of MEWP safety: the pre-shift inspection.
The Daily Pre-Shift Walk-Around
A machine can develop a hydraulic leak or structural crack overnight. Operators are legally required to perform a documented, two-part inspection before every single shift to ensure the lift is safe to operate.
1. The Visual and Structural Inspection
Before turning the key, the operator must physically walk around the base of the machine to check for physical defects.
- Fluid Leaks: Checking beneath the chassis for pooling hydraulic fluid or engine oil. A blown hydraulic line at 40 feet in the air can cause the platform to collapse.
- Tires and Wheels: Inspecting for missing lug nuts, deep cuts in solid tires, or improper inflation in pneumatic tires, which directly affects the machine's stability and center of gravity.
- Structural Integrity: Looking for cracked welds on the scissor arms or boom sections, and ensuring all guardrails and locking gates are firmly in place.
2. The Functional Test
After the visual check, the operator must test the machine's systems from the ground controls first, and then from the platform controls.
- Emergency Systems: Testing the emergency stop buttons and the emergency manual lowering valve.
- Safety Interlocks: Verifying that the tilt alarms sound when the machine is on an incline, and ensuring the pothole protection bars deploy when a scissor lift is elevated.
- Directional Controls: Confirming that the lift raises, lowers, drives, and steers smoothly without hesitation or jerking.
Fall Protection: Boom Lifts vs. Scissor Lifts
One of the most confusing aspects of MEWP safety is understanding when a harness is legally required. It depends entirely on the type of lift you are operating.
Boom Lifts (Group B): Because an articulating or telescopic boom lift can act like a catapult if it drives over a bump or gets struck by another vehicle, occupants are at extreme risk of being ejected from the basket. Therefore, workers in a boom lift must wear a full-body harness attached to a designated manufacturer anchor point with a short restraint lanyard.
Scissor Lifts (Group A): Scissor lifts only move vertically. Because the risk of ejection is incredibly low, regulatory standards generally do not require a harness and lanyard in a scissor lift, provided the guardrails and gates are fully intact and closed. However, operators must never stand on the mid-rails or toe-boards to gain extra height. Note: Site-specific safety policies may still mandate a harness in a scissor lift, which overrides the general standard.
Frequently Asked Questions
What is the difference between an aerial lift and a MEWP?
Nothing. "MEWP" (Mobile Elevating Work Platform) is simply the updated, standardized technical term used by safety organizations like ANSI and CSA to replace older terms like "aerial lift" or "aerial work platform."
Do I need a separate certification for a scissor lift and a boom lift?
Yes. While the classroom theory may be the same, boom lifts (Group B) and scissor lifts (Group A) have fundamentally different stability dynamics and controls. You must pass a hands-on practical evaluation for each specific type of machine.
What is the maximum wind speed for operating a boom lift?
While you must always check the specific machine's data plate, the general industry limit is typically 28 mph (45 km/h). Operating above the manufacturer's wind rating essentially turns the platform into a sail, creating a massive tip-over hazard.
Can I drive an aerial lift while it is elevated?
This depends strictly on the manufacturer's specifications. Some lifts are designed to be driven at a reduced speed while elevated on flat, firm surfaces. Others must be fully lowered before moving.
What should I do if a power line is near my work area?
You must maintain a Minimum Approach Distance (MAD). For standard distribution lines (up to 50kV), OSHA and most Canadian ministries mandate staying at least 10 feet (3 meters) away to prevent electrical arcing. Higher voltages require greater distances.
Who is allowed to rescue an operator trapped in an elevated lift?
Every worksite must have a documented MEWP rescue plan. Only personnel who have been specifically trained on the ground controls and emergency lowering procedures of that exact machine should attempt a rescue.
Can I use a ladder inside a scissor lift to reach higher?
Absolutely not. Placing ladders, buckets, or scaffolding on the platform floor to gain extra height is a severe safety violation and instantly compromises the guardrail protection, leading to fatal falls.
What is an emergency lowering valve?
It is a manual release valve or auxiliary power system located at the base of the machine. If the lift loses engine power or the operator becomes incapacitated, a ground worker can use this system to safely lower the platform.
How often must an aerial lift undergo a thorough inspection?
Beyond the operator's daily pre-shift inspection, ANSI and CSA standards require MEWPs to undergo a thorough, documented inspection by a qualified mechanic annually (every 13 months maximum).
Is Fall Arrest training required before taking a MEWP course?
Usually, yes. Because you will likely be operating boom lifts that require a harness, most safety training providers require you to hold a valid Fall Arrest or Working at Heights certification before they will evaluate you in a MEWP.