Nav captures with the autopilot must have an intercept angle of:

• A. 60 degrees or less
• B. 90 degrees or less
• C. 120 degrees or less
• D. 30 degrees or less

Answer: (B)

Intercept angle is the angle between what the airplane is currently flying and the navigation course it’s being steered toward by the VOR/LOC automatic guidance. When you arm NAV capture, the autopilot can lock onto and follow the nav course only if you’re not coming in too steeply toward it. If the aircraft’s current path is within 90 degrees of the desired course, the autopilot can turn toward that course and intercept it cleanly, giving a stable capture.

If the angle were greater than 90 degrees, the autopilot would have to turn more than a right angle to align with the course, which often prevents a reliable capture and can lead to chasing the wrong side of the course or instability. That’s why the allowable intercept angle is 90 degrees or less.