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Old 13th August 2009 | 16:21
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miss_heard
 
Joined: Oct 2004
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From: UK
What is "Half Scale Deflection" on a CDI?

Hi, on a CDI that has 2 dots on either side of the ILS beam centre, does "half scale deflection" equate to a 2 dot (~2.5 deg) deviation or does it refer to a 1 dot (~1.25 deg) deviation?

I'm getting very confused!

And 'generally', how much deviation would be classed as a missed approach? (1 dot or 2?)

Thanks in advance!
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