What is the maximum number of splices allowed for any single spar?

• A. One
• B. Two
• C. Three
• D. Four

Answer: (B)

Splices in a primary structural member like a wing spar are limited because each splice interrupts the continuous load path and introduces potential stress concentrations. The spar must carry bending and shear loads reliably, and maintaining as much continuous cross-section as possible preserves strength and fatigue life. Allowing only two splices in a single spar provides a balance: it fixes damaged portions while keeping enough intact material to carry the majority of the load. If more than two splices were needed, the spar’s capacity and reliability would be compromised, so the repair would be done by replacing the spar rather than adding more splices.