Under which situation are splices to a wood spar prohibited?

Splices to a wood spar are prohibited under specific circumstances to ensure the structural integrity and safety of the aircraft. Splicing is typically not allowed under a landing gear attachment fitting because this area is subjected to significant loads and stresses during landing and takeoff. The landing gear is a critical component, and any weakness in the spar structure at this point could lead to catastrophic failure of the wing or landing gear system during operation.

In contrast, splices might be more so permissible in other areas, depending on the design and stress distribution patterns of the wing. For instance, areas like those near the leading edge or trailing edge may have different load characteristics compared to points directly under a landing gear attachment, making them more feasible for splicing under controlled conditions.