Abstract: A wheeled maintenance stand for aircraft has a worker platform elevated by a pair of double scissor linkages, which have track and follower connections with a mobile base frame and the worker platform. A staircase with self-leveling steps is connected to a laterally outer side of one of the double scissor linkages. A power unit supplies fluid power for propelling the stand, operating the scissor linkages and steering. The upper worker platform has left, right and center rolling sections. A manually operated brake is provides for each of the rolling sections. Electric power, compressed air and cooling air are supplied to the upper work platform.

Abstract: A mobile worker platform providing access to the rotor area of a helicopter having outriggers spaced to straddle the helicopter landing gear.

Abstract: A burner apparatus for introducing auxilliary heat into a furnace, particularly for metallurgical heating and melting.The apparatus includes a gland which fits into a wall of a furnace, a drum-like device which fits into a mating opening in the gland, a burner sleeve in the drum for receiving a burner such as an oxy-fuel burner and directing the burner flame into the interior of the furnace. The drum and the integral burner are rotatable about an axis. Rotation of the drum moves the burner into the operative position or into the standby position clear of the furnace. Provision is made for oscillating the drum and burner during the heating operation.