JulianUK
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Weather Radar Use Taxing To Take Off Question

Mon May 22, 2006 2:28 am

If you are taxiing to your take off point and there is lots of CB activity, heavy downpours etc can the weather radar on your aircraft give you accurate information while you are on the ground, or do you have to ask ATC to see if they can give you up to date information?

As always thanks for the answers!

J
 
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zeke
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RE: Weather Radar Use Taxing To Take Off Question

Mon May 22, 2006 2:34 am

Radar on the ground works well.
We are addicted to our thoughts. We cannot change anything if we cannot change our thinking – Santosh Kalwar
 
JulianUK
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RE: Weather Radar Use Taxing To Take Off Question

Mon May 22, 2006 2:44 am

Have you got to be clear all around on take off, if the standard departure is a right turn after take off and there are some nasty CB's on the radar to the left could you ignore those as you will not be going left, or do you have to factor them in and just assume, that maybe, just maybe, you might have to turn left to avoid traffic if there was a problem?
 
SlamClick
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RE: Weather Radar Use Taxing To Take Off Question

Mon May 22, 2006 2:45 am

I try not to zap other airplanes but I do like a good sweep before I take off, especially in those quadrants where I expect to be flying. So ideally, I might be in standby until I'm number one to turn the corner onto the runway. Then I'll fire it up on shortish range and a high antenna angle and look things over. Leave it in that mode as I turn the corner and line up. Now it is sweeping the departure corridor, my area of greatest interest.

You don't want to use it so close behind another plane that you start cooking the meals in their galleys, short out the senior flight attendants' pacemakers and so on.
Happiness is not seeing another trite Ste. Maarten photo all week long.
 
Pihero
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RE: Weather Radar Use Taxing To Take Off Question

Mon May 22, 2006 2:52 am

I would avoid any active cell by at least 5 Nm -10 Nm with negative OATs- and I would refuse any ATC instruction that would take me inside that separation distance.
Contrail designer
 
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zeke
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RE: Weather Radar Use Taxing To Take Off Question

Mon May 22, 2006 3:11 am

Quoting SlamClick (Reply 3):
You don't want to use it so close behind another plane that you start cooking the meals in their galleys, short out the senior flight attendants' pacemakers and so on.

New radars (i,e, flat panel ones that have been around for about 10 years) only have a critical distance of 5 m.

Dont know about those 1950s/60s radars in 727/737.
We are addicted to our thoughts. We cannot change anything if we cannot change our thinking – Santosh Kalwar
 
SlamClick
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RE: Weather Radar Use Taxing To Take Off Question

Mon May 22, 2006 3:30 am

Quoting Zeke (Reply 5):
Dont know about those 1950s/60s radars in 727/737.

Right. The more it weighed the more dangerous it was - or the easier it was to bake apples in front of the radome.

I was told by one manufacturer of color, digital radar that their signal output was roughly the same as a DME.

That doesn't keep the FAA and flight department management from being all paranoid about it and believing that if you crank it up on the ramp it will set someone's paint afire.
Happiness is not seeing another trite Ste. Maarten photo all week long.
 
David L
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RE: Weather Radar Use Taxing To Take Off Question

Mon May 22, 2006 4:19 am

Not the same thing (lower power) but... when we installed radar on my dad's boat it was mounted on a crossbar about a metre above the deck of the flybridge so when you were sitting up there the beam "sliced" through your head. The supplier and the manufacturer reckoned that, as your head only occupied a small sector of the sweep, you'd be OK. They did, however discourage standing in the sweep zone.  Smile
 
Pihero
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RE: Weather Radar Use Taxing To Take Off Question

Mon May 22, 2006 6:52 am

Quoting Zeke (Reply 5):
Dont know about those 1950s/60s radars in 727/737.

The only recorded incident I can recall was that first officer getting some pictures of him taken infront of his DC-9, then with a virile pose with his hand on the radome...you see what I mean. Ended up with some damage to the brain, loss of licence etc...
A physician told me at that time that research had shown that normally the blood stream was enough to provide cooling to tissues being heated by the then radar beams, except the brain as most of the blood circulation was through capillary veins with not enough flow to have any efficient cooling effect.
Contrail designer

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