July 18 (Reuters) - A cockpit recording of dialogue between the two pilots of the Air India flight that crashed last month supports the view that the captain cut the flow of fuel to the plane's engines, said a source briefed on U.S. officials' early assessment of evidence.

The Indian government has proposed requiring the lowest temperature setting on all new air conditioners to be 20 Celsius, or 68 Fahrenheit.

The CEO of Air India sought to draw a line under rife speculation around the cause of last month's air disaster in Ahmedebad, saying the preliminary investigation had ruled out a mechanical cause for the crash.

Air India said on Tuesday it would partially restore its international flight schedule that was scaled back following the accident involving flight AI171 on June 12.