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

The maximum number of splices allowed for any single spar is two. This limitation is specifically put in place to ensure structural integrity and safety of the airframe. Splices are critical junctions that connect sections of the spar, and having too many can weaken the overall structure, potentially leading to failure under stress. By limiting the number of splices to two, the design maintains adequate strength and prevents excessive stress concentrations that could arise from too many joints or weak points. This regulation plays a crucial role in maintaining the aircraft's safety and reliability during operation.