The helicopter belonging to Fishtail Air, a private airlines, met with the accident while taking off from Langtang in Rasuwa district.
The accident site Langtang is a famous tourist spot situated about 150 km north of Kathmandu near the Tibetan border.
According to a staff of the airlines, the chopper lost balance and turned turtle while taking off at 3.15 pm.
The reason for the accident is not known yet.
There was only a pilot on board when the accident happened. The helicopter was damaged in the accident.
This is the fourth helicopter involved in earthquake relief work to crash in the last one year.
In May, a US Marines UH-1Y Huey helicopter went down in Sindhupalchok killing four US nationals, two Nepali soldiers and six Nepali wounded earthquake survivors.
In June, a Mountain Air chopper returning from Dolakha after distributing relief to earthquake victims crashed in Sindhupalchok, killing all four, including a Dutch national, onboard.
