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Old 31st October 2012 | 18:59
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aditya104
 
Joined: Apr 2007
Posts: 253
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From: OMAA
Alt+0176 ° degrees
Please remember the following:
  1. Glidepath for an Aircraft for the purposes of this explanation is 3°
  2. When the aircraft is within any 90Hz beam, the instrument needle will drop(fly down) and vice versa for 150Hz.
So, when your aircraft is flying in 9°(or 15°) zone in 150Hz beam, your needle will indicate fly up, eventhough you need to fly down in order to regain 3° glideslope. In the 90Hz beam though, your needle will ask you to fly down, which seems true but that will not guide you down to 3° glideslope as you will soon enter 150Hz beam.

Hope that it is clear to you now. I am reading ILS into this depth for the first time, so the information I gave could be incorrect and I would be pleased if someone were to correct it in that case. Btw, which book are you studying this from?
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