Investigators from the National Transportation Safety Board (NTSB) considered withdrawing from the Air India Flight 171 crash investigation due to slow progress and a lack of transparency. Indian authorities have delayed releasing key information about the crash, which occurred over a month ago. Accessing data from the aircraft's black boxes took longer than expected.
The crash is believed to have been caused by the Boeing 787 Dreamliner's fuel control switches being turned off, depriving the engines of fuel during takeoff and climb. It remains unclear if this was deliberate, an error, or a technical fault.
The Aircraft Accident Investigation Bureau (AAIB) released its preliminary report on the June 12 accident within ICAO's 30-day guidance. However, US investigators were frustrated with Indian authorities' reticence regarding investigation details. The AAIB initially planned to transport the plane's black boxes away from Delhi but eventually processed them in Delhi with NTSB assistance.