Position and Direction

The Position and Direction task panel provides both graphically interactive and explicit methods for positioning the lower and upper work points that define the Stair Flight, as shown in the diagram above the origin of the Stair Flight is coincident with the intersection of the Lower WP and the plane of the lower pick at the midpoint between the Stringers.

Selecting either the Lower or Upper Position link will activate the Positioning Control mechanism for graphical selection of the work points and population of the position gadgets in the form.

Explicit positioning either via the Upper or Lower WP is supported and the system will check the results of the new position against the engineering criteria of the Stair Flight to the criteria of the current specification and if valid the Stair Flight will be re-positioned. The default Flight Direction or the Stair Tower is north though once the Stair Flight has been created it is set by the application based on the positions of the lower and upper work points. Having input the Upper Work Point position using either the explicit of graphical method and the position gadget has been populated the Lower Work Point Position gadget becomes active.

Selecting the Plane toggle changes the options displayed to you for selecting the Lower Working Point. You can now specify a plane and direction onto which the Upper Work Point will be projected.

The selected position value is used to position either the landing or the landing stringer TOS, based on the selection made in FFL/TOS. Landing is either Flushed or placed above the Landing Stringer based on the selection made in Flush with Landing / Above Landing. The same applies for the Upper Work Point as well. Both these landings and the intermediate landings if any will be of thickness provided in the Landing thickness.

The U-Flight Offset is the distance till which the U-Type Stair Flight extends along the Normal direction between the picked points. If the user does not click Pick position for the distance or enters a value then the Offset value is derived using optimum values.