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On March 30, 2016, during routine equipment inspections, one customer detected cracks on the stainless steel arms on three ASAP LOCK units. In light of this information, a complete inspection of Petzl ASAP LOCK inventory was conducted and no cracked ASAP LOCK arms or Side plates were found.
Mechanical tests conducted by Petzl on the ASAP LOCK with intentionally cut arms and Side plates showed that a crack presents no additional risk to the user.
The first investigation concluded that the cracks could be the result of a combination of the riveting parameters that create a potential residual tensile stress in the stainless steel, and the heat treatment that results in this part being too rigid.
Based on these observations, Petzl has implemented technical modifications in the manufacturing process to eliminate the possibility of this phenomenon.
These results were publically published on April 18, 2016:
Since April 18, 2016, there have been a very small number of additional reports of cracks on the clevis arm and of a crack on the stainless steel side plate of the wheel.
To date, the global returns rate for this phenomenon is very low. The returns rate for normal environments is close to Zero (0.001%), but is higher (0,3%) in corrosive environments (i.e.: offshore).
Risk to Users:
Following the return of some cracked ASAP LOCK units, further EN 12841 static and dynamic tests were carried out.
These additional tests have shown that a cracked ASAP LOCK arm or locking wheel side plates presents no immediate risk to the user providing the device is used as described in the product technical instructions.
Reminder: the ASAP LOCK must always be used with an ASAP’SORBER or ABSORBICA (L57) shock absorbing lanyards.
A metallurgic analysis has been conducted on returned cracked ASAP LOCK units. This analysis confirms our earlier investigation hypothesis that the cracks are the result of a combination of the riveting parameters that create a potential residual tensile stress in the stainless steel and the heat treatment that results in this part being too rigid.
We have also concluded that a corrosive environment is playing a part in exacerbating the appearance of cracks in stainless steel which is too rigid.
Corrective actions taken by Petzl:
Petzl confirms technical modifications implemented in the manufacturing process to the Clevis Arm and Wheel side plates eliminate the possibility of this phenomenon occurring in the future (see April 18, 2016, communication).
If you encounter this problem:
Petzl is committed to continuously improve its products to serve the communities with high quality tools and continue to earn the trust of its customers. We are sorry for any inconvenience that this issue may create.