PPRuNe Forums - View Single Post - What is "Visual segment = 90m"?
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Old 7th Feb 2010, 10:41
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Wizofoz
 
Join Date: Jun 2001
Location: Boldly going where no split infinitive has gone before..
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Sure.

To takeoff in LVO both the reported and actual observed visibility must be above certain minimum values.

The REPORTED vis is usually that which is detected by transimometers (Damn!! Can't ever spell that right!!) and is typically 125m in all three segments (150 for D cat aircraft).

90m Visual segment is what the pilot must actually observe in front of the aircraft before comencing the takeoff roll.

In practical terms, as runway centreline lights are spaced at 15m intervals for CatIII operations, need to be able to see 6 lights in front of you before you can commence the takeoff.

Hope that helps.
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