Originally posted by brianw999
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The first is when there's an obstruction somewhere along the ILS path - a hill for example. In that case you'd want to maintain a safe altitude until you're past the hill, descend to a point below the glideslope, and then fly level until you intercept the glideslope. For reasons I don't fully understand, it's better to intercept a glideslope from below rather than from above.
The second situation, that's really more of a generalization than an "exception", is when you have to call off the approach. Although both can be done, it's probably easier to transition to a missed approach when you're flying straight and level than when you're descending.
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