Excessive stress forces on a rotor blade can cause which conditions?

• A. Blade Cracking, Blade Separation From Rotor
• B. Loss Of Total Lift
• C. 90 Degrees Precession
• D. Anti-Torque Tail Rotor Thrust

Answer: (A)

Excessive stress on a rotor blade primarily threatens the blade’s structural integrity. When loads exceed what the material can safely carry, fatigue cracks begin to form and grow with each rotation. As these cracks propagate, the blade loses stiffness and cross‑section strength, eventually leading to a catastrophic failure where the blade can crack through or detach from the rotor hub. That separation is the most direct and dangerous consequence of overstress, hence it is the best description of what can happen.

Other options describe effects that aren’t direct results of overstress on the blade itself. Gyroscopic precession and changes in tail rotor thrust relate to other flight dynamics or control systems, not the immediate structural failure of a blade due to excessive stress. Loss of lift is a broader performance issue and not the specific failure mode driven by blade overstress.