Rear Marshal Henry Bambang Soelistyo, head of Indonesia's National Search and Rescue Agency, said bad weather was a worry, with forecasts of rain, strong winds and high waves up to 4 metres till Sunday.
Nine bodies have been recovered so far, Soelistyo said, as the search in waters off Pangkalan Bun, Central Kalimantan entered its sixth day.
One victim of the crash has been identified and the body was returned to her family yesterday.
Indonesian Transportation Safety Committee member Antonius Toos Sanitioso said, "It may take about a week to retrieve the flight recorder and that is if the sea was calm and there are no disruptions such as noise or other obstacles."
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He said an independent investigating team will probe into the tragedy of AirAsia QZ8501.
Over 90 vessels and aircraft from numerous countries, including Singapore, Malaysia, South Korea and the US are involved in the search and rescue operation, said AirAsia.
The multi-national search mission has also recovered a number of items belonging to passengers and the aircraft, such as two black bags, one grey suitcase, an aircraft ladder and metal debris.