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C.2.12.4 Stairway Stringers a.___ Inspect spiral stairway stringers for corrosion, paint failure and weld failure. Inspect attachment of stairway treads to stringer. b.___ Inspect stairway supports to shell welds and reinforcing pads. c.___ Inspect steel support attachment to concrete base for corrosion. C.2.12.5 Rolling Ladder a.___ Inspect rolling ladder stringers for corrosion. b.___ Identify and inspect ladder fixed rungs (square bar, round bar. angles) for weld attachment to stringers and corrosion, particularly where angle rungs are welded to stringers. c.___ Check for wear and corrosion where rolling ladder attaches to gaging platform. d.___ Inspect pivot bar for wear and secureness. e.___ Inspect operation of self-leveling stairway treads. f.___ Inspect for corrosion and wear on moving parts. g.___ Inspect rolling ladder wheels for freedom of movement, flat spots, and wear on axle. h.___ Inspect alignment of rolling ladder with roof rack. i.____Inspect top surface of rolling ladder track for wear by wheels to assure at least 18 inches of unworn track (track long enough). j.____ Inspect rolling ladder track welds for corrosion. k.___ Inspect track supports on roof for reinforcing pads seal welded to deck plate. l.___ Check by dimensioning, the maximum angle of the rolling ladder when the roof is on low legs. Max. angle: _____ m.___If rolling ladder track extends to within five feet of the edge of the roof on the far side, check for a handrail on the top of the shell on that side.