The French authorities have approached the United States for help in the recovery of the sound recorder of the plane which crashed off the French Polynesian island of Mooera last week.
20 people died when the Air Moorea Twin Otter fell into the sea on its way to Tahiti.
The recorder has been located about 450 metres under water and the French authorities have asked for a large US vessel to assist in its recovery.
French investigators say it will take several days for all the equipment to arrive in order to recover the wreckage.
Six bodies are yet to be found.
The cause of the crash is still unknown.