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There are a lot of steps to flying an ILS, but here are the basics...
Before you start the approach, you must first receive a clearance from ATC. It goes something like this: "Cirrus 803 Bravo Delta, proceed direct ROKXX, maintain 7,000' until on a published portion of the procedure, cleared ILS runway 30 right approach.
This is the first fix you will go to, unless you're being vectored onto the final approach course.
The intermediate fix is the fix on the approach designed to get the aircraft established on the final approach course.
Usually co-located with the final approach fix. Glideslope intercept begins the final descent to land.
If you're flying into a towered airport, you need a landing clearance from ATC. At a non-towered field, you're responsible for announcing your intentions on CTAF, and coordinating with any other traffic at the airport.
Minimums specify the minimum altitude you can descend to without having the runway environment in sight. For an ILS, it's called DH (Decision Height), or DA (Decision Altitude). At this point, if you can't see the runway environment, you need to executed a missed approach.
If you go missed, you need to follow the prescribed missed approach procedures to the missed approach holding. When you get to the fix, you can coordinate with ATC and decide if you'll try the approach again, or if you'll divert to another airport.
Corey is a commercial aviation student and commercial pilot with multi-engine and instrument ratings who attends the John D. Odegard School of Aerospace Sciences at the University of North Dakota. He has been flying since his junior year of high school and has since started his flight instructing training. You can reach him at firstname.lastname@example.org.