Which approach involves a glide slope but does not meet precision approach standards?

Which approach involves a glide slope but does not meet precision approach standards?

• A. LDA with glide slope
• B. RNAV/GNSS (LNAV/VNAV)
• C. ILS
• D. MLS

Answer: (A)

The correct choice is the LDA with glide slope, which stands for Localizer-Type Directional Aid. This approach can provide lateral guidance similar to that of an ILS (Instrument Landing System), but its glide slope does not meet the criteria established for precision approaches. LDA approaches have a localizer component for lateral guidance, while the glide slope typically provides vertical guidance. However, since the glide slope does not meet the strict standards for precision approaches set by aviation authorities, it is classified as a non-precision approach despite the inclusion of glide slope information. In contrast, RNAV/GNSS (LNAV/VNAV) approaches qualify as precision approaches since they provide both lateral and vertical guidance that adheres to precision standards. ILS approaches are true precision systems as they meet all criteria for precision landings, which include specific requirements for both the localizer and glide slope. MLS (Microwave Landing System) is also a precision approach technique that offers similar capabilities to ILS, adhering to the necessary approach standards. Thus, the LDA with glide slope stands out because it offers glide slope information without meeting the full precision criteria, underscoring its unique status among approach types.

The correct choice is the LDA with glide slope, which stands for Localizer-Type Directional Aid. This approach can provide lateral guidance similar to that of an ILS (Instrument Landing System), but its glide slope does not meet the criteria established for precision approaches.

LDA approaches have a localizer component for lateral guidance, while the glide slope typically provides vertical guidance. However, since the glide slope does not meet the strict standards for precision approaches set by aviation authorities, it is classified as a non-precision approach despite the inclusion of glide slope information.

In contrast, RNAV/GNSS (LNAV/VNAV) approaches qualify as precision approaches since they provide both lateral and vertical guidance that adheres to precision standards. ILS approaches are true precision systems as they meet all criteria for precision landings, which include specific requirements for both the localizer and glide slope. MLS (Microwave Landing System) is also a precision approach technique that offers similar capabilities to ILS, adhering to the necessary approach standards.

Thus, the LDA with glide slope stands out because it offers glide slope information without meeting the full precision criteria, underscoring its unique status among approach types.