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The vertical stabilizer is to provide additional anti torque force to the fuselage once the aircraft has forward motion and airflow across the lifting surface. The design makes use of forward motion and the resulting airflow to create an anti torq...
stabilizer serial number is airworthiness directive 47-50-12. If your airplane is serial number 108-4968, and your horizontal stabilizer is also serial number 108-4968 (or close), then AD 47-50-12 does not apply. However if at some point the horizontal stabilizer on airplane 108-4968 was replaced with horizontal stabilizer 108-2576 (or any