737 Blown Across Ramp

Brakes should not be used to secure an airplane that is not attended, always
use chocks. An airline class airplane might be secured in strong winds with
chocks and a heavy tug with the tow bar.


"Matt Whiting" wrote in message
...
| Phil wrote:
| I know they call it the Windy City, but this is ridiculous...
|
|
http://www.aero-news.net/index.cfm?C...-86c169181d87&
|
|
| Phil
|
| What do you want to bet that the brakes weren't set?
|
| Matt

Another reason to rely on chocks instead of brakes is the unreliability of a
hydraulic parking brake. The pressure can bleed off and release the brake
after a bit. So the mistake might have been setting the parking brake
instead of using chocks.

--
Best Regards,
Mike

http://photoshow.comcast.net/mikenoel


"Matt Whiting" wrote in message
...
Phil wrote:
I know they call it the Windy City, but this is ridiculous...

http://www.aero-news.net/index.cfm?C...-86c169181d87&


Phil

What do you want to bet that the brakes weren't set?

Matt

Robert M. Gary wrote:
On Dec 27, 1:14 pm, Matt Whiting wrote:
Phil wrote:
I know they call it the Windy City, but this is ridiculous...
http://www.aero-news.net/index.cfm?C...642-d205-411d-...
Phil
What do you want to bet that the brakes weren't set?

That would be odd. Why would the brakes be set if no one was on board?
Makes it a bit tough to tow.

Uh, to keep the wind from blowing it around? :-)

Robert M. Gary wrote:
On Dec 27, 1:55 pm, wrote:

So it doesn't roll away in the wind all on it's own with no one on board?

Or, if they were expecting to tow it in the immediate future, where were
the chocks to make sure it doesn't roll away in the wind all on it's own
until they got around to towing it?

While its possible that someone does it, I'm not aware of any operator
that sets the brake on aircraft when its not occupied. Usually chalks
work just fine and are easier to move when you need to tow. In smaller
aircraft there are other reasons to avoid setting the brake, like
changes in outside pressure could burst the brake seals.

Are chalks anything like chocks?

Matt

Robert M. Gary wrote:
On Dec 27, 3:18 pm, "Bob Gardner" wrote:
Chocks, Robert, chocks. Use your dictionary.

How do you know I don't use chalks?

Given your demonstrated knowledge about parking aircraft ... I suspect
that you do use chalks.

Robert M. Gary wrote:

While its possible that someone does it, I'm not aware of any operator
that sets the brake on aircraft when its not occupied. Usually chalks
work just fine and are easier to move when you need to tow. In smaller
aircraft there are other reasons to avoid setting the brake, like
changes in outside pressure could burst the brake seals.

Since the biggest change in outside pressure that is likely to happen
is on the order of a pound and the working pressure in brakes is at
least an order of magnitude greater than that, I find it highly unlikely.

Perhaps if one were to land after extended flight at 10,000 feet at
Tucson in the middle of summer, the drastic temperature change might
have an effect, but I doubt it.

I've heard this many times and yet can imagine no situation other than
maybe leaving the brakes on for months at a time where it would do anything.

Any wrenches out there with real experiance feel free to contridict.


--
Jim Pennino

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On Dec 27, 4:18*pm, "Bob Gardner" wrote:

While its possible that someone does it, I'm not aware of any operator
that sets the brake on aircraft when its not occupied. Usually chalks
work just fine and are easier to move when you need to tow. In smaller
aircraft there are other reasons to avoid setting the brake, like
changes in outside pressure could burst the brake seals.

-Robert

Robert, out of everyone so far you are the closest. The brakes are
released as soon as the chalks in signal is recieved. This is mainly
done to facilitate brake cooling because airlines typicaly work with
45 minute turn times and leaving them set would greatly increase QTA
The brake temp actually peaks about 10 minutes after landing .the fuse
plugs can melt if the brake are left set . The 737 has a brake
acumulator which will sufice for several parking brake applications,
but chalks are still used for safety reasons . Just before push the
process is reversed, The parting brake is set before the tug is hooked
up and the chalks removed. Someone ask about brake pressures; the A&B
hydraulics run at 3000 LBS which is reduced to 300 at the gear (In the
event of a leak this prevents a total loss of fluid) I was not able to
open the link but I hope this helps.
FB

Anyone who watched the Bears game on Sunday and saw Brent Fabre say that it
was the coldest game he'd ever played it knows that it was an absolute ice
rink at Midway. You could have set those brakes at a thousand psi and that
sucker would have fancydanced across the ice in that wind.

No chocks, only tiedowns could have kept that aircraft from moving.

Jim

--
"If you think you can, or think you can't, you're right."
--Henry Ford

"aluckyguess" wrote in message
...

"Robert M. Gary" wrote in message
...
On Dec 27, 1:14 pm, Matt Whiting wrote:
Phil wrote:
I know they call it the Windy City, but this is ridiculous...

http://www.aero-news.net/index.cfm?C...642-d205-411d-...

Phil

What do you want to bet that the brakes weren't set?

That would be odd. Why would the brakes be set if no one was on board?
Makes it a bit tough to tow.

-Robert
I hear chalks fix the problem.

In article ,
wrote:

I've heard this many times and yet can imagine no situation other than
maybe leaving the brakes on for months at a time where it would do anything.

I was told during primary training that if you left the parking brake
on the pads could rust to the disks or drum and make it hard to get
moving. Don't know if that's realistic or not, but chocks and tiedowns
work a lot better for a small plane anyway.

Mike Beede

Mike Beede wrote:
In article ,
wrote:

I've heard this many times and yet can imagine no situation other than
maybe leaving the brakes on for months at a time where it would do anything.

I was told during primary training that if you left the parking brake
on the pads could rust to the disks or drum and make it hard to get
moving. Don't know if that's realistic or not, but chocks and tiedowns
work a lot better for a small plane anyway.

It is realistic and happens to cars in wet weather, but it takes several
days in wet weather for that to happen.

Depending on the parking brake on an airplane for more than a short
time is foolish in that the system wasn't really designed to hold the
airplane in place for days and weeks at a time; that's what chocks are
for.


--
Jim Pennino

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