What is the maximum width of an SDF final approach course?

• A. Up to 35 degrees
• B. Up to 30 degrees
• C. Up to 45 degrees
• D. Up to 60 degrees

Answer: (A)

The final approach course width for an SDF defines how far the inbound course can be offset from the runway centerline and still be considered part of that SDF approach. A wider width means the guidance is less exact, but the system is designed to provide usable guidance within that cone. The FAA sets this limit to keep signals reliable enough for safe alignment and to maintain obstacle clearance margins.

The maximum allowed width is 35 degrees. That means the SDF final approach course can be offset up to 35 degrees from the runway centerline. If the course were wider, it wouldn’t be designated as an SDF final approach, since the guidance would be too imprecise.