BY ORDER OF THE SECRETARY OF THE AIR FORCE AIR FORCE ...

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AFMAN 11-217V1 3 JANUARY 2005
Figure 6.6. LDA With Glide Slope.
6.10. Simplified Directional Facility (SDF).
6.10.1. SDF. The SDF provides a final approach course that is similar to that of the ILS
localizer and LDA. However, the SDF may have a wider course width of 6° or 12°. It
does not provide glide slope information. A clear understanding of the ILS localizer and
the additional factors listed below completely describe the operational characteristics and
use of the SDF.
6.10.1.1. For the pilot, the approach techniques and procedures used in the
performance of an SDF instrument approach are essentially identical to those used in
executing a standard no glide slope localizer approach except that the SDF course
may not be aligned with the runway and the course may be wider, resulting in less
precision.