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michaelqld

AAD fires during high performance landings

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I am doing a presentation on AADs and vertical speeds during high performance landings to a large group of instructors and chief instructors.

I would like to include some reliable incident data.

I know about the fatality in netherlands in 2005
JT had a fire in France in 2006(?)
I found a thread called "Non-Injury Swoop Cypres Fire " by towerrat, October 2007, no location

Any others you know about? Can you point me to any threads/info?

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Jay posted:
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Duriing a series of almost 100 test jumps and while wearing multiple x4 data loggers supplied by airtec (cypres) I was able to reach a top (vertical) speed of 106.2 mph. This was during a 810 deg turn started at 1500ft while jumping a 71 (velo proto) at a wing loading of about 3.5-1.

When jumping a 96 Velo at 2.5-1 starting a 810deg turn at 1500ft I was able to reach a top speed of 90.7 mph.
My average speeds were approx 85mph.

Note: these were the highest speeds recorded during testing and do not reflect anything close to normal speeds reached by average pilots

All jumps were performed at sea level.



Stu's reply to Jay's post: http://www.dropzone.com/cgi-bin/forum/gforum.cgi?post=2744239;search_string=jayfreefly;#2744239

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I'd like more info on this...any idea on:
Loading
Approach
Height of manuever

It looks like he was hanging on fronts from up high, then into a 360. Is that correct?



To me it looks about 400 degree turn.. (even though he says 450) Loading is 2.7 like is said on the vid. He wasnt on the fronts very long. You can see him releasing the brakes in the very beginning of the video.

I think Fred Fugen has also had a cypres fire in addition to those that were already mentioned. Good luck with the presentation, but dont expect to find too much info. I think Airtec doesnt want to give much info out on public since they regard some things as trade secrets. (like the exact minimum conditions for a cypres fire)

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Nico Emanuelsson had a cypres fire last year during a landing in Sweden. He noticed when it happened and landed without injuries.

There was another cypres activation in Sweden during a high performance landing resulting in some serious injury. I don't remember who it was, nor if it was during 2008 or 2007.

The Swedish safety committee can provide more information; sff (at) sff.se.

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Looks like that was a user error. Vigil was set to Student mode.



Why does it fire at zero vertical speed?



It's an interesting question, that. I've seen a Cypres2 fire in person where the reserve PC deployed (so not neccessarily when the cypres actually fired) at zero feet after the plane-out, and seen video of another Cypres2 fire which was identical. Why is it happening so late?
Do you want to have an ideagasm?

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Worst, he turned the AAD on and the message CTRL ERR appeared on the screen. He repeated the process and it appeared again. On the third try the Vigil started normally then he jumped it and had the misfire. Here follows the manufacturer’s reply:

Ø VIGIL #10664:
After having received the info and analyzed the graphs, the first thing we
want to remind is:
If someone has a ³CTRL ERR² message on screen, they should contact us or
their dealer to inform that there is a problem (see page 14 of our User¹s
Manual VII.0.1).
This could have avoided to continue to jump with this unit, because a ³CTRL
ERR² message means that there is a technical problem in the unit.

On the unit, we stated that one of the 6 connections (solder points) between
the pressure sensor and the PCB (printed circuit board) was not always
giving contact (we call this Œcold solder point¹).
This is a kind of defect which is very difficult to find, because it is very
rare. It cannot always be detected during all the test procedures we do on
each Vigil that comes out of production.

We want to remind you that all the controls the Vigil does when you start it
up, will show you if something is wrong (as it did in this case by giving
the ³CTRL ERR 3² message twice).

CONCLUSION:
This unit didn¹t work correctly due to this technical defect and not due to
any other reason.

REMARK:
This solder point is not accessible to be repaired. That is why we also
propose a new unit in replacement.
Please don¹t use a Vigil that gives an error message!


We hope to have answered your questions with this explanation.



It is in the owner’s manual, do not jump an unit that presents an error message.
Engineering Law #5: The most vital dimension on any plan drawing stands the most chance of being omitted

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