The datum location for weight and balance is specified in which document?

The datum location for weight and balance is specified in which document?

• A. Airworthiness Certificate
• B. Aircraft Specifications
• C. Aircraft TCDS
• D. Supplemental Type Certificate

Answer: (C)

The datum—the fixed reference point from which all weight arms are measured to compute moments and CG—is defined for each aircraft type in the Type Certificate Data Sheet. This sheet specifies where the datum is located and the corresponding CG range, along with how weight stations relate to moments. Other documents have different roles: an Airworthiness Certificate shows the aircraft is airworthy, Aircraft Specifications cover design and performance limits but don’t establish the datum location, and Supplemental Type Certificates cover modifications and updates (still referencing the original CG data but not setting the datum itself).

The datum—the fixed reference point from which all weight arms are measured to compute moments and CG—is defined for each aircraft type in the Type Certificate Data Sheet. This sheet specifies where the datum is located and the corresponding CG range, along with how weight stations relate to moments. Other documents have different roles: an Airworthiness Certificate shows the aircraft is airworthy, Aircraft Specifications cover design and performance limits but don’t establish the datum location, and Supplemental Type Certificates cover modifications and updates (still referencing the original CG data but not setting the datum itself).