Back to Basics - Series 4, Lesson 13

Key terms and aids

In this lesson, we take a look at some key terms and aids that will assist you in nailing those perfect hand-flown ILS approaches.

In this lesson, we take a look at some key terms and aids that will assist you in nailing ILS approaches.
In this lesson, we take a look at some key terms and aids that will assist you in nailing ILS approaches. Peter Stark

Decision height

We've previously mentioned the Decision Height (DH) but ILS pilots need to be very clear about what this means. While on an ILS approach, we must make a decision to land or to go around when we reach this altitude. Even if you choose to go around, the inertia of the aircraft means you will pass below the DH before starting to climb out again (Figure 1). This is fine, as long as you make the decision the moment you reach this altitude. To help you recognise this point, the ILS Middle Marker is placed so that it fires off the flashing amber warning light on your marker beacon panel and if you have turned on your marker beacons on the audio panel, it will simultaneously play a ‘dot-dash’ type tone.

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