If you are landing on this runway:

Runway 10/28
With this weather:
Which landing performance data do you use?

• Dry
• Wet
• Standing Water

Standing water should always be used during active rain, even if the runway is grooved and even if the rain is light.

Depends on what the previous weather was. Light rain does not a puddle make.


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That's not light rain (-RA). METAR is reporting moderate rain.

From AC 00-45:

JAA says that a runway is considered wet “when the runway surface is covered with water, or equivalent, less than specified [for a contaminated runway] or when there is sufficient moisture on the runway surface to cause it to appear reflective, but without significant areas of standing water.”

Would have to see the runway.
With it being grooved it may not be reflective so that would allow you to use "DRY". But to be safe you could choose wet numbers as a fudge factor.

The European Joint Aviation Authorities (JAA)2 defines dry runway as “one which is neither wet nor contaminated, and includes those paved runways which have been specially prepared with grooves or porous pavement and maintained to retain ‘effectively dry’ braking action even when moisture is present.”

And the FAA says a runway is wet when it isn't dry or contaminated.

And it's contaminated when it is neither wet nor dry. Got it!

Apparently this depends on the manufacturer, but the standing water numbers should be used in most cases. Embraer is telling me that wet numbers can never be used during active rain unless it is a grooved runway and it is light rain or mist. Standing water is 3 mm of water on 25% or more of the runway. Three mm is less than 1/8 of an inch. Most runways can't shed the water fast enough, even if they are grooved, during active rain.

http://www.faa.gov/other_visit/aviat.../SAFO15009.pdf

It really sucks for us Phenom drivers. The landing distance for standing water shoots up to 5,200 feet. You can't make the 60% rule with that at most airports.

Depends on the airplane, some can use dry numbers for a wet grooved runway.

Worst case, use the numbers you need and if the runway is visibly wet or worse when you see it, go missed. The tower could probably answer the question too.

I thought the same thing about grooved runways, but that isn't true. According to AC 91-79A, only completely dry runways qualify for dry runway performance. If the manufacturer produces performance numbers for grooved runways, then you can use that number in lieu of the standard increased distance.