Thread: Glide Slope...
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Old 11-06-2006, 08:33 PM
  #24  
FlyerJosh
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Sure, but practically speaking, if you're set for the ILS and lose the GS during the approach (inside the FAF), it's better to just go missed, set up for a non-precision approach, collect your thoughts and give it another go.

What happens if the GS goes out between the MDA and the ILS mins and how quickly will you realize it? Do you climb back up to the MDA if you're still in the soup, or just go missed? If the GS goes out, how long will it take for you to react, look at the clock, look at the plate to see the new minimums, process that mentally, double check your ground speed, reset the decision height, etc... I figure a good pilot might take 10-15 seconds, maybe more?

At 120 knots GS, in that 10-15 seconds the aircraft will travel approximately 2000-3000' and descend 50-100'. A lot can happen (in terms of approach stability) in that period, particularly for somebody that isn't 100% proficient or that's hand flying.
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