For receiving access to a motor compartment …

… pull the lever of opening of a cowl on yourself.

Then raise a cowl and through the appeared crack press a finger a ledge of a safety hook, having moved it in the direction shown by an arrow.

Take an emphasis from the holder …

… also establish it in a special nest of a cowl.

Prevention When closing a cowl check reliability of operation of the lock: at the time of locking the characteristic click has to be heard.