When the protective device is set to act, it shall not in any event be possible to prevent engagement of the bolt in its counterpart.
The technical service shall verify that, with the buckle tongue engaged in the buckle and no occupant in the seat:
- possible slack in the belt does not prevent the correct installation of child restraint systems recommended by the manufacturer, and
- in the case of three-point belts, a tension of at least 50 N can be established in the lap section of the belt by external application of tension in the diagonal section of the belt
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