United Express Blows Tires Veers off Runway in Newark

gotWXdagain said:
Landing with a set parking brake\
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Out of curiosity, how would this happen? I believe Republic had a 170 do it a few years ago, but is there any conceivable reason somebody would set the parking brake in flight other than a total brain fart or maybe some kind of systems failure where it sort of set itself.... somehow?
 
JordanD said:
Out of curiosity, how would this happen? I believe Republic had a 170 do it a few years ago, but is there any conceivable reason somebody would set the parking brake in flight other than a total brain fart or maybe some kind of systems failure where it sort of set itself.... somehow?
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Certain Embraer products (-120 -135 -145) can get one hydraulic system low on fluid, and one hydraulic system with a lot of fluid, through improper application and release of the parking brakes (or if a seal has broken in the brakes—sometimes happens). Usually Green ("system one" on the -135 if memory serves) is low and Blue (system two) is pegged off-scale high (and occasionally puking fluid out through a nacelle drain mast). The fix for this is repeated setting and releasing of the parking brakes either with or without touching the toe brakes to transfer fluids between the systems.

(I believe this is best done on the ground, while chocked, personally, because landing with the brakes locked = blown tires and a carpet dance, and possibly worse.)
 
BobDDuck said:
There are about three reasons you can blow all 4 tires on an RJ.

One of them isn't good for the crew, one of them is just plain bad luck, and one of them is bad for the airport.
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BobDDuck said:
There are about three reasons you can blow all 4 tires on an RJ.

One of them isn't good for the crew, one of them is just plain bad luck, and one of them is bad for the airport.
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Trying to transfer Hyd fluid between systems which requires cycling the brakes but forgetting to release the brake handle on the last cycle :)
Flew with a guy here that did it. The only guy here that did it. He's still here, flying the rj, at the top end of the pay scale. What a reward.
 
JordanD said:
Out of curiosity, how would this happen? I believe Republic had a 170 do it a few years ago, but is there any conceivable reason somebody would set the parking brake in flight other than a total brain fart or maybe some kind of systems failure where it sort of set itself.... somehow?
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This has happened before... And would yield the results seen in EWR... Then again, could be something else... Sure hope so..
 
BobDDuck said:
There are about three reasons you can blow all 4 tires on an RJ.

One of them isn't good for the crew, one of them is just plain bad luck, and one of them is bad for the airport.
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In the ERJ there are about 10 ways to blow all 4 tires.
 
Autothrust Blue said:
Certain Embraer products (-120 -135 -145) can get one hydraulic system low on fluid, and one hydraulic system with a lot of fluid, through improper application and release of the parking brakes (or if a seal has broken in the brakes—sometimes happens). Usually Green ("system one" on the -135 if memory serves) is low and Blue (system two) is pegged off-scale high (and occasionally puking fluid out through a nacelle drain mast). The fix for this is repeated setting and releasing of the parking brakes either with or without touching the toe brakes to transfer fluids between the systems.

(I believe this is best done on the ground, while chocked, personally, because landing with the brakes locked = blown tires and a carpet dance, and possibly worse.)
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yeah I only ever did that on the ground...
 
Bumblebee said:
yeah I only ever did that on the ground...
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yeah, I am sure the CRJ is the same way too but on the dash we can shuttle fluid from one system to another through the park brake and brakes. You can only do this on the ground though as the brakes are disabled when the WOW sensors don't sense the aircraft on the ground.
 
Pilotforhire587 said:
yeah, I am sure the CRJ is the same way too but on the dash we can shuttle fluid from one system to another through the park brake and brakes. You can only do this on the ground though as the brakes are disabled when the WOW sensors don't sense the aircraft on the ground.
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Coming from the engineering and certification side, I would be surprised to see an interlock system like that on a jet, as a WOW system failure would also cause a braking system failure. Brake failure on a turboprop is considered a 'minor' event , but it is a 'major' event on a jet.
 
No, its still bad on a prop to but WOW is not the only thing that will trigger the brakes to work. In the dash at least, the brakes and anti skid are usable by WoW or when the main wheels spin up over 35 knts for a specific amount of time. A loss of the WoW system would not disable the brakes. You would lose antiskid but the brakes would still work. The point of that was to show that you could shuttle fluid in the air by disabling the WoW system. I have no idea what happened but I imagine this could be a possibility.
 
I flew all the jet Embraers. One we bought was landed with the brake on. Made a mess. Not saying that happened here, but it's happened enough to make me say WTFO? Leave the handle down.

All the jets I've flown (Boeing's and Embraers) would transfer fluid via the shuttle valves. It's not a unique Embraer flaw.
 
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