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The ladders are made by threading and fixing a series of hardwood, machined steps, each not more than 400 mm × 115 mm × 25 mm (15.75 in × 4.53 in × 0.98 in), onto two pairs of minimum 18 mm (0.71 in) diameter manila ropes, and binding each step to the ropes at 310 mm (12 in) (+- 5 mm, 0.20 in) intervals.
A pilot ladder has specific regulations on step size, spacing and the use of spreaders. It is the use of spreaders (long treads that extend well past the vertical ropes) in a pilot ladder that distinguishes it from a Jacob's ladder. When not being used, the ladder is stowed away, usually rolled up, rather than left hanging.
Boarding stairs with canopy. Boarding stairs must be robust and stable, capable of withstanding adverse weather conditions. They are designed to adapt to the curved shape of the aircraft fuselage to which they must be attached, and to be able to raise and lower them to adjust the upper platform to the height of the aircraft, allowing passengers get on and off from the ground to the aircraft ...
The dimensions of a stair, in particular the rise height and going of the steps, should remain the same along the stairs. [14] The following stair dimensions are important: The rise height or rise of each step is measured from the top of one tread to the next. It is not the physical height of the riser; the latter excludes the thickness of the ...
Navy Regulations began with the enactment by the Second Continental Congress of the "Rules for the Regulation of the Navy of the United Colonies" on November 28, 1775. [1] The first issuance by the United States Government which covered this subject matter was "An Act for the Government of the Navy of the United States," enacted on March 2 ...
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Passenger boarding stairs. Passenger boarding stairs, sometimes referred to as boarding ramps, stair car or aircraft steps, provide a mobile means to traverse between the aircraft doors and the ground. Because larger aircraft have door sills 5 to 20 feet (1.5 to 6.1 m) high, stairs facilitate safe boarding and deplaning.