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Old 16th Aug 2013, 11:40
  #193 (permalink)  
Speed of Sound
 
Join Date: Jul 2002
Location: Ireland
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The only thing that does not look right are the four reds on the PAPI's. However their calculations show them to be right on profile and the black hole effect makes them feel like they are on profile.
I don't buy this.

You are not flying into a black hole if visibility is 10nm, you are below the scattered cloud and you can see eight bright red lights in front of you.

PAPIs either work or they don't. They are either on or off and they don't change angle once they are installed and certified. Even if I was Albert Einstein I would trust eight red lights over my calculations.

There is a very good reason why 'too low' is red and 'too high' is white.
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