For Two Nav operations, how are the ceiling and visibility minima adjusted?

• A. Ceiling: Add 200 feet to MDA or DA of the two approaches; Visibility: Add 1/2 statute mile or 800 meters to the higher landing minimum for the two approaches
• B. Ceiling: Add 400 feet; Visibility: Add 1 statute mile to the lower minimum
• C. Ceiling: Add 100 feet; Visibility: Add 1/4 statute mile
• D. Ceiling: No change; Visibility: Add 1 statute mile

Answer: (A)

Two-Nav operations rely on two independent navigation sources to determine the approach course, so there’s a greater margin needed for safety if one source is degraded or misinterpreted. To maintain obstacle clearance and safe decision-making, the ceilings (MDA or DA) are raised by 200 feet above the higher of the two published minimums, and the visibility requirement is increased by 1/2 statute mile (or 800 meters) to the higher of the two minimums. In practice, you take the higher MDA/DA from the two approaches, add 200 feet to the ceiling, and take the higher visibility and add 1/2 mile. This is why the first option is correct.