Final answer:
Local stall patterns near wing tips are concerning because they can lead to loss of lift and control issues. The primary feathers at the wing tip provide thrust while secondary feathers provide lift, mirroring aircraft wing design to minimize stall risk.
Step-by-step explanation:
The major concern with local stall patterns out near the wing tips involves the aerodynamics and flight stability of birds. The primary feathers located at the wing tip are responsible for providing thrust, while the secondary feathers closer to the body provide lift, as shown in flight feathers of birds like the common buzzard (Buteo buteo). When these feathers are not functioning properly or when the air flow over the wing is disturbed, it can lead to a stall, where the wing suddenly loses lift. This is particularly concerning near the wing tips, where stable air flow is crucial for maintaining control and preventing a spin. Effective design of aircraft wings also takes inspiration from bird's wings to minimize stall risk.