Investigators, however, found no indications of unusual behaviour among the pilots and cabin crew of the Beijing-bound Malaysia Airlines plane that dropped off radar just an hour after taking off from here on March 8.
"There were no behavioral signs of social isolation, change in habits or interest, self-neglect, drug or alcohol abuse of the captain, first officer and the cabin crew," said the 584-page interim report.
The report said Boeing 777-200's captain did not have any personal or financial problems that would cast suspicion on him.
It contained factual information about the missing plane rather than analysis. It offered relatives of the 239 people, including five Indians, on board no apparent answers about why the aircraft dropped off radar.
Meanwhile, Voice 370, a support group for the kin of those on board, hosted a Day of Remembrance at a mall here.
According to maintenance records, "The SSFDR ULB battery expired in December 2012. There is no evidence to suggest that the SSFDR ULB battery had been replaced before the expiry date."
"It is not guaranteed that it will work or that it would meet the 30-day minimum requirement."
The expired battery of the locator may suggest searchers had less chance of finding the aircraft, although the battery on the cockpit voice recorder was working.
The shipment was inspected by airline staff and went through customs inspection and clearance before it was sealed and left Penang a day before the flight. At Kuala Lumpur airport, it was loaded on to the plane without any additional security screening.
The report focused on the ordinary nature of the flight.
Investigators have so far failed to trace the debris of the plane and explain why it veered wildly off its scheduled route.
