KATHMANDU, March 13 (Reuters) - Investigators have retrieved the flight data recorder from the wreckage of a Bangladeshi airliner that crashed, killing at least 49 aboard, including the crew, when it attempted to land in Nepal's capital, officials said on Tuesday. The airline and airport authorities in Kathmandu have blamed each other in the aftermath of Monday's aviation disaster, the Himalayan nation's worst since the 1992 crash of a Pakistan International Airlines (PIA) aircraft killed 167. "The flight data recorder has been recovered, we have kept it safely," said Raj Kumar Chettri, the airport's general manager, adding that an investigation had begun into the cause of the crash. The Bombardier Q400 series aircraft was carrying 71 people from the Bangladeshi capital of Dhaka when it tried to land in conditions of visibility that weather officials said exceeded 6km, with clouds at one end of the runway and a light tailwind of six to seven knots.