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Old 25th May 2005 | 13:49
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OverRun
Prof. Airport Engineer
 
Joined: Oct 2000
Posts: 726
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From: Australia (mostly)
compressor stall

I’ve been trying to think of a good answer, and I can’t.

I don’t think the light spacing is printed in any manual – certainly not ERSA. There is some medium term move to standardise the [drafting] drawings of an airport which will (may) show the light spacing, but that is of no use to you in the cockpit.

The light spacing could change on you, and the only slight hint might be a temporary NOTAM about runway works that certainly wouldn’t mention the light spacing changes. The only mitigator I can think of is that (a) I wouldn’t think the rule B is a common occurrence – not many runways get upgraded to an instrument runway very often. And (b) the runway lights last a long time and get replaced sort of once in 20 years.

But it is quite possible for a light spacing change to ‘slip between the cracks’, and I can’t think of a reliable and practical way of preventing it.
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