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Quiz: How Much Do You Know About These 6 IFR NAVAIDs?

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Do you know your NAVAIDs?


  1. 1) An ILS glide slope path is normally set to _____ degrees above horizontal.

    The glide path projection angle is normally adjusted to 3 degrees above horizontal so that it intersects the MM at about 200 feet and the OM at about 1,400 feet above the runway elevation.

    The glide path projection angle is normally adjusted to 3 degrees above horizontal so that it intersects the MM at about 200 feet and the OM at about 1,400 feet above the runway elevation.

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  2. 2) At the normal glide slope angle, you will cross the outer marker at approximately ____ feet above the runway elevation, and you'll cross the middle marker at approximately ____ feet above the runway elevation.

    The glide path projection angle is normally adjusted to 3 degrees above horizontal so that it intersects the MM at about 200 feet and the OM at about 1,400 feet above the runway elevation.

    The glide path projection angle is normally adjusted to 3 degrees above horizontal so that it intersects the MM at about 200 feet and the OM at about 1,400 feet above the runway elevation.

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  3. 3) A Localizer Directional Aid (LDA) is comparable in accuracy to a:

    The LDA is of comparable use and accuracy to a localizer but is not part of a complete ILS. 

    The LDA is of comparable use and accuracy to a localizer but is not part of a complete ILS. 

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  4. 4) Can you use the ILS glide slope on a localizer back course approach?

    False glide slope signals may exist in the area of the localizer back course approach which can cause the glide slope flag alarm to disappear and present unreliable glide slope information. Disregard all glide slope signal indications when making a localizer back course approach unless a glide slope is specified on the approach and landing chart.

    False glide slope signals may exist in the area of the localizer back course approach which can cause the glide slope flag alarm to disappear and present unreliable glide slope information. Disregard all glide slope signal indications when making a localizer back course approach unless a glide slope is specified on the approach and landing chart.

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  5. 5) You're flying an ILS approach, and you're crossing the runway threshold. How wide is the localizer course at that point? (full scale left to full scale right)

    The localizer is 700 feet wide (full scale left to right) while crossing the threshold on an ILS approach.

    The localizer is 700 feet wide (full scale left to right) while crossing the threshold on an ILS approach.

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  6. 6) You're navigating with a VOR and you're 30 NM from the station. How wide is 1 radial (1 degree) at your current location?

    For every 60 NM from the station, 1 degree is 1 NM wide. So 30 NM from the station means 1 degree is .5 NM wide.

    For every 60 NM from the station, 1 degree is 1 NM wide. So 30 NM from the station means 1 degree is .5 NM wide.

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Hey, not bad...

You scored %. You could have done better, but you could have done worse...

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Nice work.

You scored %. Not bad.

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You've got these NAVAIDs down.

You scored %. Well done.

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Colin Cutler

Colin is a Boldmethod co-founder, pilot and graphic artist. He's been a flight instructor at the University of North Dakota, an airline pilot on the CRJ-200, and has directed development of numerous commercial and military training systems. You can reach him at colin@boldmethod.com.

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