Investigators says no track or signal for MH370 pilots and cabin crew + Malaysia and Australia Government Spends $120 Million Already.

Investigators have found no indications of unusual behavior among the pilots and cabin crew of Malaysia Airlines Flight 370 before it took off and vanished a year ago.

"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 an interim report released Sunday about the investigation into the passenger jet's mysterious disappearance.

The report, which contained factual information about the missing plane rather than analysis, offered relatives of the 239 people on board no apparent answers about why the aircraft dropped off radar.

It said MH370's captain, Zaharie Ahmad Shah, didn't have any personal or financial problems that would cast suspicion on him.

"The captain's ability to handle stress at work and home was good. There was no known history of apathy, anxiety, or irritability," the report said. "There were no significant changes in his lifestyle, interpersonal conflict or family stresses."

Investigators looked into the backgrounds of the different crew members. They also examined closed-circuit TV footage of the flight crew at airports on at least three previous flights and saw no signs of change in behavior.

Expired battery on beacon

The interim report, which Malaysian authorities were required to release under international civil aviation standards, revealed that the battery of the underwater locator beacon on MH370's flight data recorder expired more than a year before the plane's disappearance.

The report, citing maintenance records, said that there was no evidence to suggest the battery was replaced before its expiry in December 2012. While such a battery can operate past its expiry date, it said, "it is not guaranteed that it will work or that it would meet the 30-day minimum requirement."

The battery on the plane's other so-called black box, the cockpit voice recorder, was replaced as scheduled and remained within its expiry date, the report said.

Investigators interviewed maintenance staff and found that the computerized replacement schedule had not been updated correctly when the flight data recorder, and its locator beacon were replaced in February 2008.

The mistake was not discovered until after MH370's disappearance, the report said, and Malaysia Airlines subsequently checked its entire fleet of planes to make sure there were no other oversights.