What is the first step to take when experiencing a left elevator jam?

The first step when experiencing a left elevator jam is to pull and lock the pitch disc handle. This action is critical because it disconnects the elevator control system from the jammed elevator, allowing the pilot to regain control over the aircraft's pitch without being hindered by the malfunction.

By locking the pitch disc handle, the pilot ensures that any unintentional movements from the jammed elevator do not adversely affect the flight path, providing the opportunity to assess and address the issue in a controlled manner. This immediate action can be vital in preventing further complications during a potentially dangerous situation.

After this step, additional actions such as checking systems for faults, notifying air traffic control, or engaging emergency mode may follow, but they are secondary to first securing control of the aircraft.