Petzl ZIGZAG User manual

2 - 10 kN

15 kN

1 / 2

19/04/2013

Safety Alert

Stop use Petzl ZIGZAG mechanical Prusik

Sku. D22

This information is complementary to the Safety Information issued April 15, 2013

On Friday, April 12, Petzl was informed of an accidental fall in a training center in Germany. The injured person was

moving at height using a Petzl ZIGZAG mechanical Prusik. The initial observations have shown that the fall was due to a

failure of the rope end attachment hole. Our investigation and further testing lead us to conclude that this failure was the

result of a particular conﬁguration of a cantilevered and off axis loaded upper carabiner.

2/3 - ZIGZAG with a cantilevered upper

carabiner

This is an incorrect conﬁguration.

Note: most of the carabiners tested this way pivot and

correct themselves to be loaded on the major axis

starting at 2 kN of force. Some carabiners pivoted and

corrected themselves at 10 kN, without damaging the

upper attachment hole.

1/3 - Breaking strength of the ZIGZAG’s

rope end attachment hole

With this carabiner conﬁguration, the breaking

strength of the rope end attachment hole is greater

than 15 kN.

Petzl test Results:

2 kN 2 kN

4 kN

2 / 2

19/04/2013

3/3 - ZIGZAG with a cantilevered and off axis upper loaded upper carabiner

This is an incorrect conﬁguration.

We are fully aware of the inconvenience caused by this issue. Please accept our apologies and know we take this issue

very seriously. The safety of our users is Petzl’s ﬁrst priority. Thank you for your continued trust.

Petzl decisions:

1 - As a measure of precaution, we ask that you stop using your ZIGZAG mechanical

Prusik.

2 - This stoppage will remains in place until we have approved and communicated an appropriate solution

to maximize the safety of ZIGZAG users.

3 - We have decided to stop sales of ZIGZAG mechanical Prusiks.

4 - While there currently may be several solutions to maintain the upper carabiner correctly oriented on its

major axis, Petzl cannot presently guarantee their effectiveness in all circumstances because we have not

tested them sufﬁciently.

5 - Our teams are mobilized to quickly develop and verify a solution speciﬁcally for the ZIGZAG to maintain

the upper carabiner oriented on its major axis.

6 - The availability of this solution will be communicated on www.petzl.com by May 22, 2013 at the latest.

In this conﬁguration, we have observed a failure of the

rope end attachment hole of the ZIGZAG under 4 kN

of charge (equivalent to short fall, repeated shock or

sudden stop, etc).

The cantilevered upper carabiner in this particular

conﬁguration multiplies the forces applied to the rope end

attachment hole, leading to its failure.

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