Investigators were trying to learn what caused the plane to crash into the Java Sea with 189 people aboard.
Investigators continue to search for clues as to why the aircraft crashed in the Mediterranean Sea.
The airline's maintenance system was "not optimal", investigators said.
Now that authorities believe a pilot involved in the Germanwings crash may have deliberately locked another pilot out of the cockpit, air safety experts question whether reinforced cockpit doors are too secure
In wake of Germanwings crash, experts call for updated technology to pinpoint crash locations.
Data from the black box, which was found on Tuesday morning, is currently being analyzed.
The beacon battery for the flight data recorder expired in December 2012 and was not replaced.
The second black box, containing the cockpit voice recorder, has been located but not yet retrieved.
The teams have found the fuselage and now are focusing in on the black box
The black box recorders would give vital information about the cause of the crash
Indonesian officials said they had not yet picked up any signals from the lost plane's "black box".