(Example Scenario))

A new airframe component weighs 62 pounds. It is approximately cubicle, about two feet long on each side, and in smooth packaging. The AMT must position it at waist level during installation.

Issues

What is the best way for an AMT to lift this item?
How do you measure the Horizontal Location variable, “H”, for the NIOSH lifting equation in this situation?
What is the difference between the two vertical variables: “V” and “D”?
Would this be an example of a “Good” coupling?
If the AMT must hold the component to one side during installation, would this be better, or worse?

Solution

1.What is the best way for an AMT to lift this item?

 The NIOSH lifting equation, shown in Methods, and the discussion and worksheet related to it indicate that the maximum weight that can be lifted by an individual is 51 pounds. Technically, there is no safe way for an individual to lift more than 51 pounds, unassisted. The best way for an AMT to lift this 62-pound component is to get someone else to help

2. How do you measure the Horizontal Location variable, “H”, for the NIOSH lifting equation in this situation?

Measure the Horizontal Location variable from the midpoint of a line connecting the inside of the protruding ankle bones to the midpoint of a line connecting the hand grip locations.

3. What is the difference between the two vertical variables: “V” and “D”?

“V” refers to the vertical height of the hand-grip locations, measured at both the origin, or beginning, of the lift and at the destination, or end.

“D” refers to the distance traveled by the lifted object during the lift. It is the absolute value of the
difference between beginning and ending height of the hand-grip locations.

4. Would this be an example of a “Good” coupling?

This would probably get a poor grip rating, because the component is large and the packaging is smooth, i.e., has no handles or hand-grips.

5. If the AMT must hold the component to one side during installation, would this be better, or worse?

This would be an example of asymmetrical lifting. In the lifting equation, the Recommended Weight Limit is reduced when there is an asymmetric lifting component. Therefore, this type of lift will significantly reduce the amount of weight that can be lifted safety.