![]() When flying an ILS, you track the line formed by the intersection of the glide slope and localizer courses. You should observe the initial downward movement of the indicator and lead the descent to intercept the glide slope centerline accordingly. Since your aircraft is usually below the glide slope during the intermediate approach segment, the glide slope indicator will display a full-up needle deflection. This point may or may not be at the middle marker. Although you may reach the decision height at or near the middle marker, the charted MAP for an ILS approach is the point where the glide slope intercepts the decsion height. If you maintain the glide slope for an approach, you should reach the decision height at approximately the middle marker. For the same glide slope angle (usually 3°), you will need a lower rate of descent as your groundspeed decreases, and vice versa. The rate of descent you should maintain primarily depends on your groundspeed. The glide slope gives you vertical guidance on the final approach course. This applies regardless of your direction of travel, whether inbound or outbound on either the front or back course. With an HSI, you can avoid reverse sensing by setting the published front course under the course index. The way it works in real life is the tower decides which is the active runway and switches on the corresponding ILS. This so-called double-ended ILS is pretty common. Reverse sensing occurs inbound on the back course and outbound on the front course. The root of the problem is that its also the ILS for 34R. When using a basic VOR indicator, normal sensing occurs inbound on the front course and outbound on the back course. This provides the information regarding your alignment with the runway centerline. To help you determine your distance from the runway, the ILS installation may provide DME fixes or marker beacons located along the ILS approach path. You recieve guidance information from ground-based localizer and glide slope transmitters. The ILS installation is made up of several components.
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