During VSV rigging, at what degree position does the mechanical rig lock?

The mechanical rig lock during Variable Stator Vane (VSV) rigging typically engages at 113.5 degrees. This specific angle is critical for aligning the VSVs correctly to ensure optimal performance of the gas turbine. The precise positioning allows for the proper control of airflow within the engine, which is essential for efficient combustion and overall engine operation.

Rigging at the correct angle ensures that the vanes maintain their intended functional shape and positioning during operation, which contributes directly to the turbine's efficiency and responsiveness to varying loads and atmospheric conditions. This attention to detail in setup is crucial for maintaining the reliability and longevity of the engine components. Other angles mentioned in the options do not correspond with the standard practices in the industry for VSV mechanical rigging, underscoring why 113.5 degrees is the accepted standard for achieving the desired performance outcomes.