"(We) are very surprised that both the airline and Ministry of Communications and Information Technology (MCIT) have chosen to quickly accept the results of the report without further and more extensive evaluations," the association representing the families said in a statement Mar 8.

It also expressed doubt over how SilkAir, owned by Singapore Airlines, could learn from the accident and prevent a repeat, given that the airline accepted a report that did not provide a probable cause.

Responding to the association's statement, a SilkAir spokesman said: "The official report was reached after three years of investigation. We would have liked a more final conclusion, but there was not one."

MCIT could not be reached for comment.

The report on the crash of SilkAir flight MI185, compiled by Indonesia's National Transportation Safety Committee (NTSC), was released in December last year, almost three years after the accident in Indonesia. NTSC said in its report on the crash, which killed all 104 aboard the Boeing 737-300, that there was no evidence to explain the cause of the disaster.

This finding was disputed by the US National Transportation Safety Board (NTSB), which assisted in the crash investigations.

Commenting on NTSC's report, the NTSB said the factual evidence was consistent with the conclusion that the accident could be explained by intentional pilot action, and no aircraft-related mechanical malfunction or failure caused the crash.

NTSC, however, defended its findings and said the available evidence did not rule out that there were no airplane-related mechanical malfunctions or failures.

The association representing the families said it was "greatly concerned about the overwhelming differences and contradictions" in the conclusions reached by NTSC and the NTSB.

"As a widely experienced organisation in aircraft accident investigations, the NTSB's comments must surely raise questions on the conclusions of the final report," it added.

It urged the government to "take a more proactive role in evaluating the quality of the crash report and its recommendations."

The Families of SilkAir MI185 Association, led by David Beevers, who lost his pregnant wife in the crash, was formed shortly after the accident.