EGLC - runway wet/wet/wet
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EGLC - runway wet/wet/wet
Could get my head blown off here , but here goes!
Can anyone explain why the ATIS at London City sometimes states that the runway is wet/wet/wet although it is grooved?
I thought that if a runway were grooved, it was always considered dry unless contaminated?
Thanks
Can anyone explain why the ATIS at London City sometimes states that the runway is wet/wet/wet although it is grooved?
I thought that if a runway were grooved, it was always considered dry unless contaminated?Thanks
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Re: EGLC - runway wet/wet/wet
Official definitions are:
DAMP The surface shows a change of colour due to moisture.
NOTE: If there is sufficient moisture to produce a surface film or the surface appears reflective, the runway will be reported as WET.
WET The surface is soaked but no significant patches of standing water are visible.
NOTE: Standing water is considered to exist when water on the runway surface is deeper than 3mm. Patches of standing water covering more than 25% of the assessed area will be reported as WATER PATCHES.
WATER PATCHES Significant patches of standing water are visible.
NOTE: Water patches will be reported when more than 25% of the assessed area is covered by water more than 3mm deep.
FLOODED Extensive patches of standing water are visible.
NOTE: Flooded will be reported when more than 50% of the assessed area is covered by water more than 3mm deep.
DAMP The surface shows a change of colour due to moisture.
NOTE: If there is sufficient moisture to produce a surface film or the surface appears reflective, the runway will be reported as WET.
WET The surface is soaked but no significant patches of standing water are visible.
NOTE: Standing water is considered to exist when water on the runway surface is deeper than 3mm. Patches of standing water covering more than 25% of the assessed area will be reported as WATER PATCHES.
WATER PATCHES Significant patches of standing water are visible.
NOTE: Water patches will be reported when more than 25% of the assessed area is covered by water more than 3mm deep.
FLOODED Extensive patches of standing water are visible.
NOTE: Flooded will be reported when more than 50% of the assessed area is covered by water more than 3mm deep.
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Re: EGLC - runway wet/wet/wet
..And as far as water is concerned, JAR - Ops does not consider a runway to be contaminated if it is either DAMP or WET, only if it is reported as Water Patches or Flooded.
RC
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Re: EGLC - runway wet/wet/wet
A grooved runway can still be damp/wet etc. What is stated is that, unless a runway notified as "Slippery When Wet", then it can be assumed that any surface condition of Damp or Wet will not affect braking action. It's not that the runway can't be wet, just that it doesn't need to have braking action tests carried out on it in that state.
Re: EGLC - runway wet/wet/wet
Similar problem at SOU, grooved runway but nowhere for water to drain off. Consequently water sits in grooves, although the surface appears either "damp" or "dry", as previously defined. OPS vehicle drives over grooves, tyres throw water up, driver hears water thrown up, et voila, wet or damp runway. At SOU, normally reported wet, two, three or more hours after it has stopped raining.
When it really gets interesting is when the water freezes, water in grooves freezes and expands out of the grooves, and runway ends up corrugated! Net result, airport stays shut for half of the day. I report for an early departure, never to get airborne. Ice freezes by lunchtime.
And that's an airport from the "World Class Airport Group"!
Stuff your grooves, give me a runway with a reasonable camber or crossfall with somewhere for the water to drain, and what I then see is what I get for runway state.
When it really gets interesting is when the water freezes, water in grooves freezes and expands out of the grooves, and runway ends up corrugated! Net result, airport stays shut for half of the day. I report for an early departure, never to get airborne. Ice freezes by lunchtime.
And that's an airport from the "World Class Airport Group"!
Stuff your grooves, give me a runway with a reasonable camber or crossfall with somewhere for the water to drain, and what I then see is what I get for runway state.
Glad to help....
LOL! Fair point! Best not get too cocky....
