NEW YORK (AP) _ Two construction workers and their employer have been indicted in the May 30 collapse of a 35-ton crane that seriously injured a pedestrian, District Attorney Robert Morgenthau said today.

Charges of assault and reckless endangerment were returned against Richard Ricciardi, 29, the crane operator; Lino Palmieri, 51, the construction foreman; and Thomas Crimmins Construction Co. Both men are from the Bronx.

The crane fell at a site on Third Avenue between 63rd and 64th Streets where the Crimmins company was laying the foundation of a 42-story apartment house.

Morgenthau said that in the late morning, trucks delivered two tons of steel reinforcement rods for the foundation.

A qualified crane operator was not on the site, so Ricciardi - a compressor operator who was neither trained nor licensed to operate a crane - tried to use the crane to unload the rods from the delivery truck, the prosecutor said.

Palmieri ''solicited, assisted and supervised'' Ricciardi, according to Morgenthau.

The crane toppled over and fell on Brigitte Gerney, trapping her for several hours. She was later freed and taken to a hospital, where she required treatment of extensive leg injuries.

If convicted, each of the men faces up to seven years in prison, and the company could be fined up to $10,000.