Which statement correctly describes the Localizer Type Directional Aid (LDA)?

• A. Similar to a localizer but not part of an ILS; more precise than an SDF
• B. Identical to a localizer and part of an ILS
• C. A type of VOR
• D. An ILS component that uses GPS overlays

Answer: (A)

Localizer Type Directional Aid is essentially a localizer-like lateral guidance system that operates independently of any ILS. It provides a similar sense of course information to a localizer, guiding you toward the runway centerline, but it isn’t part of an ILS and typically doesn’t include a published glide slope or the same ILS certification. Because it uses a more precise, localizer-type signal rather than the broader SDF format, it is generally more precise than an SDF. This explains why the statement describing it as similar to a localizer but not part of an ILS and usually more precise than an SDF is the best way to describe it. It isn’t a VOR, and it isn’t an ILS component that relies on GPS overlays, which is why those options aren’t correct.