MADISON, Wis. (AP) -- A second Med Flight helicopter leased by University of Wisconsin Hospital is grounded in the wake of the crash of one after it took off from La Crosse Saturday night.

Med Flight director Mark Hanson says both have been leased from Air Methods in Denver.

He says that, if air service is needed while the helicopters are grounded, other helicopters being used by other hospitals may be used.

Hanson says neither helicopter had any mechanical problems since going into service.

But Hanson says the two helicopters, along with 21 other Air Methods helicopters, were grounded for a week earlier this year for paperwork issues that did not pertain to the structural integrity or reliability of the aircraft.

The copter model is American Eurocopter EC13.