This series of tests examines the impact protection provided by the subject helmet, by dropping it onto one of several steel "anvils". The anvil, shown in the picture (below left) is hemispherical. Other profiles (e.g. flat surface) are also used.

Each drop results in the delivery of localised impact energy to the helmet (as required by the appropriate standard). Specialist equipment (including lasers) is used to ensure accuracy of the impact site.

HPE's main concern is for the safety of the subject user. HPE is therefore required, by the authorities, to use experience to identify the most susceptible sites for impact. Where no such sites are identified, they will be selected to ensure maximum coverage.

The energy that is transmitted to the head assembly, in each impact, is measured by shock sensors. Any impact which results in an acceleration of greater than a specified limit, in the head assembly, will result in the failure of the whole batch.

The test is passed if all of the impacts are completed without exceeding the acceleration limit.

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