Popular 170 Mobile Stair, with a reach up to 170.5" (B-767) is now available with either AC or DC electric power. Quiet, efficient propulsion system offers a pro-active option (diesel and gas power units also available). Highly maneuverable unit is easy to position — operator can see doorsill during approach to the airplane. Makes final docking and alignment simple. Rugged wrap-around steel bumper protects unit from dings and dents inherent with ramp traffic. Model 170 looks better longer, compared to modified pick-ups. Model 170 Stair shares design elements and parts commonality with several other NMC-Wollard products. Helps simplify fleet maintenance and reduce parts inventory.