In case of "Smoke in Cockpit," what is the first action a pilot should take?

The appropriate first action a pilot should take when encountering "Smoke in Cockpit" is to activate emergency oxygen and land as soon as possible. This is crucial because smoke in the cockpit presents an immediate threat to the pilot's ability to operate the aircraft safely due to impaired visibility and potential toxic inhalation. By activating the emergency oxygen, the pilot ensures they can breathe adequately while also maintaining consciousness and situational awareness.

Landing as soon as possible is essential to mitigate the risk of fire, smoke inhalation, or other complications that could worsen during flight. Time is of the essence in this situation, and immediate action can prevent further escalation of the emergency.

The other choices do not address the most critical risks associated with smoke in the cockpit. For example, turning on all electrical systems could potentially exacerbate the situation if the smoke is related to an electrical fire. Calling for ground assistance is a secondary action that is not critical during such an immediate emergency. Additionally, filtering the air using cabin air controls would not be effective in dealing with smoke and may be impractical given the circumstances.