Sadly one passenger was killed and others injured when the engine on the
Southwest 737 failed today.

The turbine blades in jet engines are under stress and heat during
operation and are the usual failure mode in cases like this.
There is a "containment ring" that is supposed to prevent the flying
turbine blades from damaging the aircraft but it appears that it didn't
capture all the flying parts today.

Heard the head of the NTSA state that this failure happens "3 or 4 times
a year".

It isn't confirmed yet that turbine blade failure is the cause of this
particular event but it most likely is.

We built a system for Pratt and Whitney back in the 80's to deposit
thin film strain gauges and thermocouples (temp measurement) on the
turbine blades for real time operating monitoring of the turbines.

On Tue, 17 Apr 2018 17:18:09 -0400, "Mr. Luddite"
wrote:


Sadly one passenger was killed and others injured when the engine on the
Southwest 737 failed today.

The turbine blades in jet engines are under stress and heat during
operation and are the usual failure mode in cases like this.
There is a "containment ring" that is supposed to prevent the flying
turbine blades from damaging the aircraft but it appears that it didn't
capture all the flying parts today.

Heard the head of the NTSA state that this failure happens "3 or 4 times
a year".

It isn't confirmed yet that turbine blade failure is the cause of this
particular event but it most likely is.

We built a system for Pratt and Whitney back in the 80's to deposit
thin film strain gauges and thermocouples (temp measurement) on the
turbine blades for real time operating monitoring of the turbines.

Here is a little more about that engine failure
https://www.avweb.com/eletter/archives/101/4022-full.html?ET=avweb:e4022:323843a:&st=email#230684

On 4/18/2018 11:26 AM, wrote:
On Tue, 17 Apr 2018 17:18:09 -0400, "Mr. Luddite"
wrote:


Sadly one passenger was killed and others injured when the engine on the
Southwest 737 failed today.

The turbine blades in jet engines are under stress and heat during
operation and are the usual failure mode in cases like this.
There is a "containment ring" that is supposed to prevent the flying
turbine blades from damaging the aircraft but it appears that it didn't
capture all the flying parts today.

Heard the head of the NTSA state that this failure happens "3 or 4 times
a year".

It isn't confirmed yet that turbine blade failure is the cause of this
particular event but it most likely is.

We built a system for Pratt and Whitney back in the 80's to deposit
thin film strain gauges and thermocouples (temp measurement) on the
turbine blades for real time operating monitoring of the turbines.

Here is a little more about that engine failure
https://www.avweb.com/eletter/archives/101/4022-full.html?ET=avweb:e4022:323843a:&st=email#230684



Sounds like when that turbine blade snapped it went in a direction that
missed the containment ring.

Those blades used to be a nickel/titanium alloy. I've read that some
are now made of a metal/ceramic. They are under high stress and high
temperatures.

Mr. Luddite wrote:
On 4/18/2018 11:26 AM, wrote:
On Tue, 17 Apr 2018 17:18:09 -0400, "Mr. Luddite"
wrote:


Sadly one passenger was killed and others injured when the engine on the
Southwest 737 failed today.

The turbine blades in jet engines are under stress and heat during
operation and are the usual failure mode in cases like this.
There is a "containment ring" that is supposed to prevent the flying
turbine blades from damaging the aircraft but it appears that it didn't
capture all the flying parts today.

Heard the head of the NTSA state that this failure happens "3 or 4 times
a year".

It isn't confirmed yet that turbine blade failure is the cause of this
particular event but it most likely is.

We built a system for Pratt and Whitney back in the 80's to deposit
thin film strain gauges and thermocouples (temp measurement) on the
turbine blades for real time operating monitoring of the turbines.

Here is a little more about that engine failure
https://www.avweb.com/eletter/archives/101/4022-full.html?ET=avweb:e4022:323843a:&st=email#230684



Sounds like when that turbine blade snapped it went in a direction that
missed the containment ring.

Those blades used to be a nickel/titanium alloy. I've read that some
are now made of a metal/ceramic. They are under high stress and high
temperatures.


I always wonder when on a propeller plane why they have seats opposite the
prop. On Air Force planes, we had a big red stripe on the fusillade where
a prop blade would slice the airplane if it came free .

On Wed, 18 Apr 2018 16:32:16 -0000 (UTC), Bill
wrote:

Mr. Luddite wrote:
On 4/18/2018 11:26 AM, wrote:
On Tue, 17 Apr 2018 17:18:09 -0400, "Mr. Luddite"
wrote:


Sadly one passenger was killed and others injured when the engine on the
Southwest 737 failed today.

The turbine blades in jet engines are under stress and heat during
operation and are the usual failure mode in cases like this.
There is a "containment ring" that is supposed to prevent the flying
turbine blades from damaging the aircraft but it appears that it didn't
capture all the flying parts today.

Heard the head of the NTSA state that this failure happens "3 or 4 times
a year".

It isn't confirmed yet that turbine blade failure is the cause of this
particular event but it most likely is.

We built a system for Pratt and Whitney back in the 80's to deposit
thin film strain gauges and thermocouples (temp measurement) on the
turbine blades for real time operating monitoring of the turbines.

Here is a little more about that engine failure
https://www.avweb.com/eletter/archives/101/4022-full.html?ET=avweb:e4022:323843a:&st=email#230684



Sounds like when that turbine blade snapped it went in a direction that
missed the containment ring.

Those blades used to be a nickel/titanium alloy. I've read that some
are now made of a metal/ceramic. They are under high stress and high
temperatures.


I always wonder when on a propeller plane why they have seats opposite the
prop. On Air Force planes, we had a big red stripe on the fusillade where
a prop blade would slice the airplane if it came free .

I suppose a better question is why anyone would choose to sit there.

BTW, interesting (even if accurate) spell check correction. ;-)

wrote:
On Wed, 18 Apr 2018 16:32:16 -0000 (UTC), Bill
wrote:

Mr. Luddite wrote:
On 4/18/2018 11:26 AM, wrote:
On Tue, 17 Apr 2018 17:18:09 -0400, "Mr. Luddite"
wrote:


Sadly one passenger was killed and others injured when the engine on the
Southwest 737 failed today.

The turbine blades in jet engines are under stress and heat during
operation and are the usual failure mode in cases like this.
There is a "containment ring" that is supposed to prevent the flying
turbine blades from damaging the aircraft but it appears that it didn't
capture all the flying parts today.

Heard the head of the NTSA state that this failure happens "3 or 4 times
a year".

It isn't confirmed yet that turbine blade failure is the cause of this
particular event but it most likely is.

We built a system for Pratt and Whitney back in the 80's to deposit
thin film strain gauges and thermocouples (temp measurement) on the
turbine blades for real time operating monitoring of the turbines.

Here is a little more about that engine failure
https://www.avweb.com/eletter/archives/101/4022-full.html?ET=avweb:e4022:323843a:&st=email#230684



Sounds like when that turbine blade snapped it went in a direction that
missed the containment ring.

Those blades used to be a nickel/titanium alloy. I've read that some
are now made of a metal/ceramic. They are under high stress and high
temperatures.


I always wonder when on a propeller plane why they have seats opposite the
prop. On Air Force planes, we had a big red stripe on the fusillade where
a prop blade would slice the airplane if it came free .

I suppose a better question is why anyone would choose to sit there.

BTW, interesting (even if accurate) spell check correction. ;-)



Yup, it is a fusillade if the prop or turbine blades exit their assigned
positions.

Bill wrote:
Mr. Luddite wrote:
On 4/18/2018 11:26 AM, wrote:
On Tue, 17 Apr 2018 17:18:09 -0400, "Mr. Luddite"
wrote:


Sadly one passenger was killed and others injured when the engine on the
Southwest 737 failed today.

The turbine blades in jet engines are under stress and heat during
operation and are the usual failure mode in cases like this.
There is a "containment ring" that is supposed to prevent the flying
turbine blades from damaging the aircraft but it appears that it didn't
capture all the flying parts today.

Heard the head of the NTSA state that this failure happens "3 or 4 times
a year".

It isn't confirmed yet that turbine blade failure is the cause of this
particular event but it most likely is.

We built a system for Pratt and Whitney back in the 80's to deposit
thin film strain gauges and thermocouples (temp measurement) on the
turbine blades for real time operating monitoring of the turbines.

Here is a little more about that engine failure
https://www.avweb.com/eletter/archives/101/4022-full.html?ET=avweb:e4022:323843a:&st=email#230684



Sounds like when that turbine blade snapped it went in a direction that
missed the containment ring.

Those blades used to be a nickel/titanium alloy. I've read that some
are now made of a metal/ceramic. They are under high stress and high
temperatures.


I always wonder when on a propeller plane why they have seats opposite the
prop. On Air Force planes, we had a big red stripe on the fusillade where
a prop blade would slice the airplane if it came free .



Similar engine failure killed a bunch years ago. The DC10 that lost
hydraulics when the engine sheared the hoses near the tail. Crashed on
landing. Iowa I think.

On Wed, 18 Apr 2018 12:12:41 -0400, "Mr. Luddite"
wrote:

On 4/18/2018 11:26 AM, wrote:
On Tue, 17 Apr 2018 17:18:09 -0400, "Mr. Luddite"
wrote:


Sadly one passenger was killed and others injured when the engine on the
Southwest 737 failed today.

The turbine blades in jet engines are under stress and heat during
operation and are the usual failure mode in cases like this.
There is a "containment ring" that is supposed to prevent the flying
turbine blades from damaging the aircraft but it appears that it didn't
capture all the flying parts today.

Heard the head of the NTSA state that this failure happens "3 or 4 times
a year".

It isn't confirmed yet that turbine blade failure is the cause of this
particular event but it most likely is.

We built a system for Pratt and Whitney back in the 80's to deposit
thin film strain gauges and thermocouples (temp measurement) on the
turbine blades for real time operating monitoring of the turbines.

Here is a little more about that engine failure
https://www.avweb.com/eletter/archives/101/4022-full.html?ET=avweb:e4022:323843a:&st=email#230684



Sounds like when that turbine blade snapped it went in a direction that
missed the containment ring.

Those blades used to be a nickel/titanium alloy. I've read that some
are now made of a metal/ceramic. They are under high stress and high
temperatures.

Looking at that picture, the ring may have come apart too. I assume
that jagged metal was the ring. It is clear that engine pretty much
disintegrated from the inside out. When you think about the forces on
a jet engine, it is amazing that they work at all.
Here is an interesting conversation about fan tip speeds and RPMs but
only the intellectually curious will enjoy it.

http://www.airliners.net/forum/viewtopic.php?t=741473

BTW if you don't subscribe to AvWeb you might want to. That is a place
to get aviation news written for pilots, not just the normal folks.
They usually get to the bottom of incidents like this better than the
media at large.