Indonesian Air Force soldiers show the cockpit voice recorder of AirAsia QZ8501 at Iskandar airbase in Pangkalan Bun, Central Kalimantan January 13, 2015. Indonesian divers pulled out the cockpit voice recorder from the sunken wreckage of an AirAsia passe
Indonesian Air Force soldiers show the cockpit voice recorder of AirAsia QZ8501 at Iskandar airbase in Pangkalan Bun, Central Kalimantan January 13, 2015. Indonesian divers pulled out the cockpit voice recorder from the sunken wreckage of an AirAsia passenger jet on Tuesday, a key step towards determining the cause of the crash that killed all 162 people aboard. Indonesia AirAsia's Flight QZ8501 lost contact with air traffic control in bad weather on Dec. 28, less than halfway into a two-hour flight from Indonesia's second-biggest city of Surabaya to Singapore. REUTERS/Prasetyo Utomo/Antara Foto REUTERS/Prasetyo Utomo/Antara

The conclusive report of the investigations into AirAsia Flight QZ8501 that plunged into the Java Sea in December 2014 will be made available a year from now, an Indonesian official said on Tuesday. This developed as divers have found and retrieved both the cockpit voice recorder (CVR) and flight data recorder (FDR), collectively known as a plane's black boxes.

The FDR, officials in charge of search-and-rescue efforts said, was found beneath a wing of AirAsia Flight QZ8501, while the CVR, which retains all sounds made on a plane's flight deck, was located nearby, approximately 20 metres away, positioned just under heavy wreckage. Analysts believed the Airbus A320-200 aircraft "ruptured" instantly the moment it made impact with water, after a fall of over 30,000 feet. The FDR keeps the information about the aircraft's performance, including air speed and cabin pressure.

Tatang Kurniadi, Chairman of Indonesian Transport Safety Committee, told a press conference in Pangkalan Bun city, central Kalimantan the final report covering the results of the probe into the crash of AirAsia Flight QZ8501 "will be released one year later." This would mean sometime in 2016. Officials said the data on both boxes surrounding the aircraft's crash could take weeks to download and analyse.

Kurniadi said a preliminary factual report with no analysis will be released within one month.

The formal investigation will start once the preliminary report has been released. He added France, Singapore and United States will receive a copy of the draft of the final report of what happened to AirAsia Flight QZ8501. The countries will be asked to submit their evaluations.

The blackboxes, according to the National Search and Rescue Agency (BASARNAS) Republic of Indonesia, have been evacuated and flown to Jakarta for further investigation by Indonesia's National Transportation Safety Committee (KNKT). It is the body leading the investigation into the disaster. Mardjono Siswosuwarno, a KNKT senior official, said the CVR will "tell us what happened in there." He added both black boxes were in good condition when pulled out of the water.

AirAsia Flight QZ8501 had a total of 162 people on board when the tragedy happened. There have been 48 bodies recovered so far from the sea. Some were found still strapped into seats. Over 100 remain missing. Experts believed the missing maybe found at the fuselage or main body of the plane.