Under what condition is manual leveling permissible during lifting operations?

Under what condition is manual leveling permissible during lifting operations?

• A. When leveling controls are centrally located and there are no more than 14 jacks
• B. When there are more than 20 jacks
• C. When jacks are unevenly spaced
• D. Only when automatic leveling devices fail

Answer: (A)

Manual leveling is allowed during lifting operations only when the leveling controls are located centrally and there are no more than 14 jacks. This arrangement lets the operator monitor and adjust all the jacks from one safe point, reducing exposure to the load and improving coordination during the leveling process. Keeping the jack count at or below fourteen ensures the leveling task remains manageable and can be accomplished safely. If there are more than fourteen jacks or the controls aren’t centralized, manual leveling becomes too complex and riskier, so it wouldn’t be permitted. The presence or absence of automatic leveling devices isn’t the trigger here—the rule focuses on centralized control access and the limited number of jacks.

Manual leveling is allowed during lifting operations only when the leveling controls are located centrally and there are no more than 14 jacks. This arrangement lets the operator monitor and adjust all the jacks from one safe point, reducing exposure to the load and improving coordination during the leveling process. Keeping the jack count at or below fourteen ensures the leveling task remains manageable and can be accomplished safely. If there are more than fourteen jacks or the controls aren’t centralized, manual leveling becomes too complex and riskier, so it wouldn’t be permitted. The presence or absence of automatic leveling devices isn’t the trigger here—the rule focuses on centralized control access and the limited number of jacks.