D-nose

D-nose

D-nose
Very strong leading edges of an airfoil formed from heavy skin and spar. They often form the structural basis of the entire airfoil as in the rotors of helicopters. Also called D-spar.
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Figure 4 shows the typical location of the electrical, bleed air and fre-wire system components on the front spar and leading edge D-nose. Two typical D-nose rib sections are also shown, where the systems pass through the D-nose ribs at the slat tracks.
The electric harness is housed in raceways which connect to the D-nose skin with brackets.
Systems located in the D-nose component also produce access and interface issues.
In addition the fixed jig requires the D-nose to be fixed with pinned arm interfaces, similar to the trailing edge.
Instead of the traditional "D-nose," says Ticona, the composites have enabled designers to create a more efficient "J-nose." This design allows it to house electrical, de-icing, and other systems.