Parallelogram type with treads pivoting on full length stringers. Robust all steel construction, the stair flight is mounted on a welded steel chassis sub-frame. Automatic lift-mast locking mechanism fitted to protect against hydraulic failure when elevated.
The stair treads and mid landing & top-platform walking-area are surfaced with grip-faced aluminium tread-plate. Sliding doors on top platform with hand-operated spring-bolts at both sides of the top-platform to facilitate opening the aircraft doors with the Steps interfaced with the Aircraft. Leading edges fitted rubber buffering. A pivoting-section with rubber buffering is fitted at the leading edge of the top platform to compensate with fuselage contours.
The stair has tubular-steel side/hand rails with a midrail and clad with aluminium panels, fitted to both sides of the stair-flight. Full aluminium panels are fitted to the sliding rails at each side of the top platform. All hand railing fitted with plastic covering available in a range of colours.
Steering is turntable-type through a ball-bearing ring, controlled by the tow-bar. Tow-bar has a 50mm diameter towing-eye and grip-handle to assist coupling.
Four, 5-stud fixing, two-piece wheels, with industrial pneumatic 500-8 tyres are fitted on hubs with taper-roller bearings.
Parking-brake – operating on front steering wheels, actuated by raising the tow-bar. Tubular-steel pushrails are fitted at the rear end of the chassis both sides, providing a conveniently positioned hold for pushing and pulling. Jacks are fitted to the sides of the chassis-frame.
The front two are mounted on pull-out extending extension arms for increased stability. These arms supported on nylon rollers slide easily & are retained by spring loaded pins when retracted or extended.
Passenger Stairs - TPS 3056 Datasheet
