Has anyone heard of the G200's having problems with the brakes freezing in flight after flying through weather?

Never heard of that...

I have heard-- and with everything on the G200, this is different on each serial number--of brakes being spongy or mushy on landing after a long flight (say 2hrs +). There is one valve for both pedals and there is fluid on either side of this valve. The valve is regulated by the pedals themselves, and there is warm fluid on one side, and cold on the other. By pumping the brakes after the gear is down, you cycle this valve and now mix the cold with the warm, and now your brakes will be much more responsive after landing. I have seen this, tried it, and it works.

There is only one valve that is operated by BOTH pedals, so only one side needs to pump the brakes-- and it is irrelevant which side performs this action.

On a side note about the G200 and brakes--- for those operators that test the "emergency" brakes on the first flight of the day, you are not testing the "emergency" brakes (the accumulator), you are testing normal pressure braking from the hydraulic system through the emergency position on the brake lever... there is no way to test the accumulator braking without shutting down the engines while moving. Check it if you want, but realize you are not testing the accumulator.

Spike, do you know if this was changed in the 250 program?

Thanks Spike
I have heard about pumping of the brake before landing. What happened to our G200 was it took off in heavy rain. When it landed it flat spotted the left side tires and blew both right almost instantly. I hear some rumors of this happing to some NetJet planes but nothing confirmed. Gulfstream can't find anything wrong with brake system so we think they might have froze.

ce650-- as far as I know (remember, I am out of the loop) the braking system/gear on the 250 is the same as the 200... but this was one of the many "known issues" that were discussed when I was there.

Feenomm-- yeah, what you described is definitely not the same issue. I have never heard of that.

Not sure about flying through weather....but some planes have issues with carbon brakes and freezing after they depart in precip, wet surfaces, or even after being washed.

Falcon has suggested operating with brake heat on after such departures (to 20K feet?)...and cycling the brakes after lowering the gear.

Never heard of it being an issue..guessing just a cover your a$$ thing...

Yes, I have heard of that. Flight Safety talks about this on the day you do the cold weather ops in the sim. After departure you don't retract the gear for 30 sec. Then on approach after you extend the gear turn the anti-skid off, pump the brakes 6 or 7 times then turn the anti skid back on.

Better yet, if carbon brakes have been exposed to water (slush, heavy rain, washed), warm them up on taxi out to dry them BEFORE take-off. Even in the tropics, water soaked brakes will freeze when exposed to cold temps aloft. Turning off the anti-skid and pumping the brakes before landing may not do anything.

GF

Yup I agree. when this happened the FBO they left from was already at the end of the runway so it was a very short taxi before takeoff. After 3 months of down time and meeting with Gulfstream they are putting this in the manual.