Head of Aircraft Accident Investigation Group (AAIG) of Bangladesh Capt Salahuddin M Rahmatullah left for Kathmandu on Sunday.
The expert will conduct joint investigation on the plane crash with Nepalese probe committee and other foreign experts.
"We are giving emphasis on the black box and CVR (cockpit voice recorder) to know the actual fact behind the crash," said he, according to BSS.
Apart from the Nepalese probe committee, he said, representatives from the aircraft manufacturer - Bombardier of Canada, engine manufacturer of the aircraft, and a British company will also join in the investigation.
"There will be no representative from US-Bangla airlines in the investigation procedure to make it unbiased," he added.
As per Annex 13 of ICAO (International Civil Aviation Organisation), one accredited representative from the airlines host country can conduct investigation jointly with the probe team of the country witnessed accident.
"We nominated Head of our AAIG as our accredited representative in this regards," Wing Commander Chowdhury M Ziaul Kabir, Director (flight Safety and regulations) of Civil Aviation Authority of Bangladesh (CAAB) said.
Kabir said as per the ICAO rule, the accredited representative can take help form some advisers, if it is needed. "We keep five more officials of AAIG on standby in this regards. If the AAIG Head is needed support they will join him as adviser later on," he said.
The AAIG was formed under CAAB in June, 2016 to investigate any aircraft accident independently.
At least 49 people, including 26 Bangladeshi nationals, were killed as the US-Bangla Airlines aircraft crashed and burst into flames at the Nepalese capital on Monday last.
