What are the standard takeoff visibility minimums?

• A. 2 engines: 1SM; 3+ engines: 1/2SM
• B. 2 engines: 1/2SM; 3+ engines: 1SM
• C. 2 engines: 2SM; 3+ engines: 1/2SM
• D. 2 engines: 1SM; 3+ engines: 2SM

Answer: (A)

Standard takeoff minimums are the default visibility a pilot must have to begin an IFR takeoff when no other published minimums apply. They vary with the number of engines because engine-out performance and obstacle clearance during the initial climb change with engine count. With two engines, losing one engine leaves you with limited thrust and control, so a higher visibility helps ensure you can maintain the necessary visual references and clearance if you need to continue or abort the takeoff. That’s why the standard minimum is higher for two-engine airplanes. For airplanes with three or more engines, the extra redundancy and thrust allow for a lower visibility requirement, hence the smaller minimum. So the standard takeoff minimums indicate 1 statute mile for two-engine airplanes and 1/2 statute mile for 3+ engine airplanes.