Which document provides the formula used to calculate corrected torque when the extension is toward the handle?

• A. AC 43.13-1A
• B. AC 43.13-1B
• C. AC 47-01
• D. AC 130-22

Answer: (B)

The situation hinges on how adding an extension to a torque wrench changes the effective lever arm and thus the actual torque delivered. When an extension is toward the handle, the wrench’s lever arm is altered in a way that requires a specific correction to the indicated torque to achieve the desired fastener torque. AC 43.13-1B is the publication that provides the formulas and guidance for calculating corrected torque for different extension configurations, including when the extension is toward the handle. That makes it the appropriate reference for this calculation. The other documents cover different topics or older revisions and do not provide this particular extension-torque correction formula.