Which data sheet contains arm data for installed items on an aircraft?

• A. The Aircraft Flight Manual.
• B. The Weight and Balance Handbook.
• C. The Maintenance Manual.
• D. The Type Certificate Data Sheets for the aircraft.

Answer: (D)

Arm data, which tells you how far each installed item’s weight is from the reference datum, comes from the Type Certificate Data Sheets for the aircraft. These sheets define the official arm distances for all installed equipment and configurations, providing the authoritative data you need for accurate weight and balance calculations. The Aircraft Flight Manual focuses on operating limits and performance, not the exact arm distances of installed items. The Weight and Balance Handbook shows how to perform calculations and may list general data, but it relies on the arm values specified in the type certificate data sheets. The Maintenance Manual is about procedures and schedules, not weight and balance.