During an ILS approach, what is the consequence of glide slope failure?

When a glide slope failure occurs during an Instrument Landing System (ILS) approach, the consequences can vary depending on the situation. The correct answer indicates that the pilot can still continue using the localizer Minimum Descent Altitude (MDA).

In an ILS approach, the localizer provides lateral guidance, while the glide slope offers vertical guidance. If the glide slope is lost but the localizer signal remains operational, the pilot can still rely on the localizer to guide the aircraft towards the runway. In this scenario, the pilot would typically transition from a precision approach (which the ILS is intended to provide) to a non-precision approach, utilizing the localizer to help navigate to the runway while maintaining altitude until reaching the MDA.

This ability to continue the approach is crucial, as it provides a fallback option and allows for the possibility of completing the landing safely, rather than immediately abandoning the approach or diverting to another airport. Thus, the pilot can maintain situational awareness and make informed decisions based on the conditions and available instruments.