The investigation on the October 2018 crash of Boeing Co's 737 MAX jet that killed 189 finally turned up results when Indonesian investigators discovered design and oversight lapses.
The draft conclusions, the first government finding not only found flaws in the design but also in the US regulatory approval as well maintenance mistakes and pilot errors as factors that contributed to the Lion Air crash in the Java Sea.
Details of the report which are going to be subjected for further analysis is to come out in early November.
Boeing's 737 MAX models of planes had been grounded since March because of two fatal crashes that happened within a span of five months.
Staying mum about the findings, a Boeing spokesman said the planemaker supports the authorities as they finish their report.
The Indonesian investigators who made the draft conclusions weren't available for comment.
On the other side of the world, US air crash investigators are getting ready to announce safety recommendations ranging from enhancing both the Federal Aviation Administration's (FAA) manner of vetting new aircraft designs to boosting pilot's flying skills.
Likewise, by the end of September, the US National Transportation Safety Board (NTSB) is to call for improvements on certification of new airliners with additional enhanced cockpit training and crew decision making.
The aim is to ensure pilot proficiency the moment automated systems malfunction or get turned off so that there will be correct responses to confusing cockpit warnings.
The board is also to set priority checklists during emergencies.
Though NTSB didn't comment on this, it noted its plans to release recommendations on the FAA's certification program this month.
It also added that the agency is looking forward to the findings of safety experts say that the company continues "to work with other international aviation safety regulators."
It stressed that "the FAA will incorporate any changes that would improve certification" with the aim of making approvals more transparent, with greater predictability and more consistency.
The US or Indonesian recommendations will not be binding on the FAA even if the agency already is under pressure from both the government and public including different blue-ribbon advisory panels, more than half a dozen outside inquiries and the Justice Department's criminal probe with regards to changing certification procedures.
Even the Senate put pressure on the FAA to address recommendations.
Though previous reports said that MAX might return to the skies at the end of the year, with everything that is happening, the FAA said it can't give a timetable when it will allow MAX jets back in service.
Boeing had earlier said it is collaborating with authorities to have MAX back in the air as soon as possible.