FAA Instrument Rating Written Practice Test

When conducting an Instrument Landing System (ILS) approach, the glide slope provides vertical guidance to ensure the aircraft descends at the correct angle toward the runway. If the glide slope becomes inoperative but the runway is visible, the appropriate action is to descend using another visual guidance system, such as the Visual Approach Slope Indicator (VASI). This system will provide a visual indication of whether you are above, below, or on the proper glide path to the runway, allowing for a safe landing despite the loss of the glide slope.

Using the VASI helps maintain a safe approach angle, especially in visual conditions where the runway is in sight. Pilots must ensure that they do not descend too aggressively or too shallowly, as this can affect the safety of the approach and landing.

In this scenario, the other options may not adequately address the immediate need for vertical guidance while still adhering to safety protocols. For example, proceeding with a visual approach without proper guidance could lead to unsafe altitude management. Cancelling the approach and flying a holding pattern adds unnecessary delay when the runway is visible, and requesting to circle to land might not be necessary or the safest option when the aircraft can instead continue with a guided descent.