Torque values can be found in

• A. Maintenance manual
• B. AC43.13-1B
• C. Both
• D. None

Answer: (C)

Torque values come from both the aircraft’s manufacturer and the regulatory guidance that crews use as a reference. The maintenance manual is the primary source for a specific aircraft, engine, or component and will list the exact torque required for each fastener based on size, grade, lubrication, and thread condition. If the manual doesn’t specify a value for a particular situation, or if you’re cross-checking common fastener sizes, AC 43.13-1B provides general torque tables and accepted practices that apply across many airframes and components. So, for accurate torque, you check the maintenance manual for the exact value and, when needed, use AC 43.13-1B as a reliable reference guide. This combination helps ensure the joint is properly tightened without risking over- or under-torquing, which could compromise safety.