Nine days after a 7.8-magnitude quake brought death and destruction to the Himalayan nation, the helicopters surveyed mountain villages.
Four tilt-rotor Ospreys have also arrived in Nepal.
"Only the 'Hueys' (helicopters) have gone out so far for reconnaissance flights to try to identify areas in need of relief. No Ospreys have been out," a US embassy official told AFP today.
The Ospreys and a US Air Force C-17 aircraft touched down in the capital Kathmandu yesterday.
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"They're going to make an immediate difference," said US Brigadier General Paul Kennedy.
A Nepalese official said the US aircraft would also airlift victims out of remote areas which suffered some of the worst devastation following the April 25 quake.
"They are also assisting any casualties in mostly the eastern side of Nepal... Places worst hit like Sindhupalchowk, Gorkha area," Suraya Prasad Silwal, the home ministry secretary, told AFP.
While the official death toll for Nepal rose to 7,365 today, with some 14,000 injured, authorities warned the final tally would be much higher. More than 100 people were also killed in neighbouring India and China.
"A few foreigner bodies were taken to Kathmandu from Langtang yesterday. According to villagers there, they say many other foreigners may have been buried and killed in the landslide," the spokesman said.