Airbus rudder AD

And who was it insulting me earlier on this list for not wanting to fly
plastic airplanes???

"Helen Woods" wrote in message
...
And who was it insulting me earlier on this list for not wanting to fly
plastic airplanes???

You were insulted for being completely ignorant of glass cockpits and making
utterly false and ridiculous statements about them, not plastic airplanes.
Near as I can tell you haven't learned much since then.

"Morgans" wrote in message
...
..

A tap test? Is this is the best they can do to find possible flaws on
multimillion dollar aircraft, carrying thousands of people around?

What is that? They whack it with a hammer to see if it breaks? What about
cracks and damage caused by the test?

("C J Campbell" wrote)
A tap test? Is this is the best they can do to find possible flaws on
multimillion dollar aircraft, carrying thousands of people around?

What is that? They whack it with a hammer to see if it breaks? What about
cracks and damage caused by the test?


I read that composites don't show cracks, instead they have weak 'air
pocket' spots that can't be seen during inspections. These pockets of air
bubles(?) are caused by heat/cold to the composite structures over time.

Think early British Comet jets - we're learning as we go I guess.

Whack, whack, whack ...she's good to go.


Montblack - sorry no link

In a previous article, "Montblack" said:
I read that composites don't show cracks, instead they have weak 'air
pocket' spots that can't be seen during inspections. These pockets of air
bubles(?) are caused by heat/cold to the composite structures over time.

My father, who was the Chief of Non-Metallic Materials at deHavilland
Canada said that this is bunk. Once the composite is made and given the
initial inspection, there is no way in hell they could delaminate like
that.


--
Paul Tomblin http://xcski.com/blogs/pt/
We're the technical experts. We were hired so that management could
ignore our recommendations and tell us how to do our jobs.
-- Mike Andrews

Ummm.............. I must respectively differ..

My company also does some marine surveying, ( inspecting
pleasure boats in insuring and pre-buy situations).

Ans , yes, I have seen many examples of this "delamination" of
composiets...

....many cause factors, osmosis being the most common, poor
quality control/contamination during layup are others....

Dave

On Wed, 23 Mar 2005 03:02:04 +0000 (UTC),
(Paul Tomblin) wrote:

In a previous article, "Montblack" said:
I read that composites don't show cracks, instead they have weak 'air
pocket' spots that can't be seen during inspections. These pockets of air
bubles(?) are caused by heat/cold to the composite structures over time.

My father, who was the Chief of Non-Metallic Materials at deHavilland
Canada said that this is bunk. Once the composite is made and given the
initial inspection, there is no way in hell they could delaminate like
that.

But isn;t that just gelcoat delam. Cosmetic, and it occurs by osmotic
pressure on parts of the hull submerged in salt water?

On Wed, 23 Mar 2005 23:07:09 -0400, Dave
wrote:

Ummm.............. I must respectively differ..

My company also does some marine surveying, ( inspecting
pleasure boats in insuring and pre-buy situations).

Ans , yes, I have seen many examples of this "delamination" of
composiets...

....many cause factors, osmosis being the most common, poor
quality control/contamination during layup are others....

Dave

On Wed, 23 Mar 2005 03:02:04 +0000 (UTC),
(Paul Tomblin) wrote:

In a previous article, "Montblack" said:
I read that composites don't show cracks, instead they have weak 'air
pocket' spots that can't be seen during inspections. These pockets of air
bubles(?) are caused by heat/cold to the composite structures over time.

My father, who was the Chief of Non-Metallic Materials at deHavilland
Canada said that this is bunk. Once the composite is made and given the
initial inspection, there is no way in hell they could delaminate like
that.

Dave wrote:

....many cause factors, osmosis being the most common

This would have to be a pretty wet climate for osmosis to happen on an
airplane...

Stefan

In a previous article, Dave said:
Ans , yes, I have seen many examples of this "delamination" of
composiets...

It would be easier to understand or give credence to your points if you
knew how to spell or punctuate.

....many cause factors, osmosis being the most common, poor
quality control/contamination during layup are others....

Osmosis happens to things immersed in salt water, which hopefully isn't
the case with aircraft rudders. And the "poor quality
control/contamination during layup" are why I specified that these things
would be caught in the initial inspection. Aircraft parts are subject to
a lot more quality control and tougher inspections that your boats.

Anyway, I suspect you are seeing cosmetic flaws in the gelcoat, not full
on structural failures.


--
Paul Tomblin http://xcski.com/blogs/pt/
I've never understood why women douse themselves with things that are alleged
to smell of roses/tulips/freesias. What exactly are they trying to attract?
Bees? -- Tanuki

Montblack - you said exactly what I was thinking - British Comets.

Dave
68 7ECA


Montblack wrote:
("C J Campbell" wrote)

A tap test? Is this is the best they can do to find possible flaws on
multimillion dollar aircraft, carrying thousands of people around?


What is that? They whack it with a hammer to see if it breaks? What about
cracks and damage caused by the test?



I read that composites don't show cracks, instead they have weak 'air
pocket' spots that can't be seen during inspections. These pockets of
air bubles(?) are caused by heat/cold to the composite structures over
time.

Think early British Comet jets - we're learning as we go I guess.

Whack, whack, whack ...she's good to go.


Montblack - sorry no link