The utility model has the advantages of the reliable quality, the simple manufacture and the convenient use, and thereby is an ideal recording instrument for recording the motor vehicle accidents.

Details of the doomed plane's last minutes began to emerge last month as French air accident investigators studied data recorders recovered from the wreck earlier this year.

Known officially as "event data recorders" or EDRs, they work much like an airplane's black box in that they only capture data related to a crash.