A combined unit of the Digital Flight Data Recorder (DFDR) and the Cockpit Voice Recorder (CVR) was recovered from the crash site on June 13, and another set was found on June 16. This model of aircraft has two black box sets. A multi-disciplinary team from AAIB commenced an investigation into the crash on June 12 itself. The investigation was ordered by the DG, AAIB. US NTSB and OEM teams also arrived to assist the AAIB as per ICAO protocols. The investigators are reported to have looked into whether a dual-engine failure would have resulted in the crash. The investigation is being led by AAIB officials and includes technical experts from the Indian Air Force, Hindustan Aeronautics Limited (HAL), and the US National Transportation Safety Board (NTSB), which represents the country where the aircraft was designed and manufactured. The probe is being overseen by the Director General of the AAIB. The investigation team also includes an aviation medicine specialist and an Air Traffic Control officer.