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Author: mesaminemesamine Date: Nov 23, 2007 16:48
A310 rudder exploded in flight says report
By David Learmount
An A310-300's rudder literally exploded in flight, according to the
just-published final report by the Transportation Safety Board of
Canada (TSBC) on the 6 March 2005 incident.
The incident destroyed almost all of the single-section composite
rudder, but the aircraft landed safely.
The report says aircraft took off from Varadero, Cuba bound for
Quebec, Canada "with a pre-existing disbond or an in-plane core
fracture damage to the rudder, caused by either a discrete event, but
not a blunt impact, or a weak bond at the z-section of the left side
panel.
This damage deteriorated in flight, ultimately resulting in the loss
of the rudder".
The TSBC describes the probable cause: "During the occurrence flight
[the weakened area of the rudder] having reached the critical size,
the damage rapidly propagated, resulting in a loud and sudden
explosion of the skin.
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Author: CoopCoop Date: Nov 23, 2007 17:42
On Fri, 23 Nov 2007 16:48:20 -0800 (PST), mesamine@ gmail.com wrote:
>A310 rudder exploded in flight says report
>By David Learmount
>
>An A310-300's rudder literally exploded in flight, according to the
>just-published final report by the Transportation Safety Board of...
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Author: ventus50ventus50 Date: Nov 23, 2007 19:03
>
> Would have made for interesting flying characteristics- or do these
> machines have alternative methods for countering Dutch Roll?
>
> Coop
French, not Dutch .....................
um, loss of yaw damping, um, as I seem to remember from some text, the
fix is simply to (very gently), reduce speed and altitude below
270kias / fl250
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Author: CoopCoop Date: Nov 23, 2007 21:42
On Fri, 23 Nov 2007 19:03:05 -0800 (PST), ventus50
unwired.com.au> wrote:
>
>>
>> Would have made for interesting flying characteristics- or do these
>> machines have alternative methods for countering Dutch Roll?
>>
>> Coop
>
>French, not Dutch .....................
>
>um, loss of yaw damping, um, as I seem to remember from some text, the
>fix is simply to (very gently), reduce speed and altitude below
>270kias / fl250
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Author: RTRT Date: Nov 24, 2007 02:09
gmail.com> wrote in message news:326d2a51-8102-4d2f-ab1f-
> This model of rudder does not include any design features in the
> sandwich panels to mechanically arrest the growth of disbond damage or
> in-plane core failure before the damaged area reaches critical size
> (such a feature was not specifically demanded for certification)."
Ouch........ That's a bit scary. I hope such features were required for
the Dreamliner.
> Rudder inspections were ordered via a series of all-operators telexes
> as the investigation progressed, and the TSBC comments: "These various
> inspections found examples of disbonds, damage around hoisting points
> and trailing edge fasteners of the rudder, corrosion and abrasion at
> hinges, seized hinges, hinges with excessive free play, and water
> ingress."
But other than that they were ok? :-)
IIRC the Harrier elevator I mentioned earlier hadn't disbonded - just a
piece about the size of a meatplate between the spars and ribs was missing.
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Author: matt webermatt weber Date: Nov 24, 2007 13:05
On Sat, 24 Nov 2007 12:12:47 +1030, Coop
chariotnose.netwheel.au> wrote:
>On Fri, 23 Nov 2007 16:48:20 -0800 (PST), mesamine@ gmail.com wrote:
> >>A310 rudder exploded in flight says report
>>By David Learmount
>>
>>An A310-300's rudder literally exploded in flight, according...
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Author: matt webermatt weber Date: Nov 24, 2007 13:09
On Sat, 24 Nov 2007 20:09:55 +1000, "RT" nowhere.com.au>
wrote:
>
> gmail.com> wrote in message news:326d2a51-8102-4d2f-ab1f-
>>> This model of rudder does not include any design features in the
>> sandwich panels to mechanically arrest the growth of disbond damage or
>> in-plane core failure before the damaged area reaches critical size
>> (such a feature was not specifically demanded for certification)."
>
>Ouch........ That's a bit scary. I hope such features were required for
>the Dreamliner.
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Author: RTRT Date: Nov 24, 2007 20:55
"matt weber" verizon.net> wrote in message
news:fh4hk351skmhtf54boinkedouj363k3nkj@4ax.com...> On Sat, 24 Nov 2007 20:09:55 +1000, "RT" nowhere.com.au>
> wrote:
>>>
>> gmail.com> wrote in message news:326d2a51-8102-4d2f-ab1f-
>>>>> This model of rudder does not include any design features in the
>>> sandwich panels to mechanically arrest the growth of disbond damage or
>>> in-plane core failure before the damaged area reaches critical size
>>> (such a feature was not specifically demanded for certification)."
>>
>>Ouch........ That's a bit scary. I hope such features were required
>>for
>>the Dreamliner.
>
> Dreamliner has strain gauges incorporated into the structure, so it is
> likely you will be able to see the forces that lead to failure, long
> before failure occurs. I.E. de-bonds will cause stress increases in ...
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Author: matt webermatt weber Date: Nov 25, 2007 11:50
On Sun, 25 Nov 2007 14:55:24 +1000, "RT" nowhere.com.au>
wrote:
>
>> In metal, you can use Eddy current, and dye tests to spot small
>> cracks. In a composite materiall, if the problem isn't on the inside
>> or outside surface, it can be very hard to find, and there are
>> circumstances where ultasonic inspection won't show it either.
>
>Although I haven't actually used it for such, I'd expect ultrasonic to be
>extremely effective in detecting any debonding
IF there is 'empty space' in the debond area Ultrasound works fine,
but there is nothing to prevent the bonding material from failing, and
under test conditions such as on the ground (as opposed to under
load), the debonded layers may still in contact with each other, in
which case, Ultrasound won't see the debond.
>
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