g200 brake question
05-05-2011, 05:10 AM
#2
Gets Weekends Off
Joined APC: May 2010
Position: Not on this message board.
Posts: 159
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.
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.
05-05-2011, 10:53 AM
#4
On Reserve
Thread Starter
Joined APC: May 2011
Posts: 10
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.
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.
05-05-2011, 11:32 AM
#5
Gets Weekends Off
Joined APC: May 2010
Position: Not on this message board.
Posts: 159
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.
Feenomm-- yeah, what you described is definitely not the same issue. I have never heard of that.
05-05-2011, 02:12 PM
#6
Gets Weekends Off
Joined APC: Aug 2008
Posts: 423
Originally Posted by Feenomm
Has anyone heard of the G200's having problems with the brakes freezing in flight after flying through weather?
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...
05-14-2011, 07:29 PM
#7
Line Holder
Joined APC: May 2006
Position: GALX
Posts: 66
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.
05-23-2011, 04:15 PM
#8
Gets Weekends Off
Joined APC: May 2010
Position: Baja Vermont
Posts: 5,177
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
GF
05-25-2011, 10:00 AM
#9
On Reserve
Thread Starter
Joined APC: May 2011
Posts: 10
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.
Thread
Thread Starter
Forum
Replies
Last Post
RVSM Certified
Flight Schools and Training
22
02-27-2009 12:04 PM
