High-mounted aircraft nacelle
A nacelle mounted above a wing of an aircraft. A support structure on the nacelle above the pylon resists forces in different directions, and includes door supports allowing the door to be opened upwardly. A retaining structure on the pylon below the nacelle resists forces in different directions, and includes a fixed support track and multiple keepers. Each keeper includes a first end which slides within the channel, and a second end which engages a latch on the closed door. A pylon below the nacelle supports the nacelle and an engine in the nacelle above the wing, increases aerodynamic efficiency, and may include a side spar for supporting the engine from the side. A fire seal assembly includes a depressor surface and a fire seal, and the latter does not contact the former until the door is almost closed, so that compression is substantially direct and scrubbing is reduced.
1. A support structure for a nacelle housing an engine, the nacelle being mounted on a pylon above a surface of an aircraft and including a door, the support structure comprising:
a lower component including—
forward support coupled with the engine and configured to resist a longitudinal force and a vertical force; and
an upper component including—
a fan case attachment configured to couple with a fan case of the engine and to resist the longitudinal force and a lateral force,
an aft support configured to couple with an aft portion of the engine and to resist the vertical force and the lateral force, and
one or more door supports configured to couple with the door and facilitate moving the door between an open position and a closed position,
wherein the support structure is located on the nacelle above the pylon.
2. The support structure of claim 1 , wherein the support structure is located on the nacelle opposite the pylon.
3. The support structure of claim 1 , wherein the door is a cowl door configured to provide access to an interior of the nacelle.
4. The support structure of claim 1 , wherein the door is a thrust reverser door configured to redirect an exhaust of the engine.
5. The support structure of claim 1 , wherein the fan case attachment includes—
a forward fan case attachment configured to couple with a forward portion of the fan case portion of the engine; and
an aft fan case attachment configured to couple with an aft portion of the fan case portion of the engine.
6. The support structure of claim 5 , wherein the forward fan case attachment includes one or more support links configured to resist the vertical force and the lateral force.
7. The support structure of claim 6 , wherein the aft fan case attachment includes one or more adjustable links to resist the vertical force.
8. The support structure of claim 7 , wherein the aft fan case attachment includes a spigot connection having a fitting including a spigot pin coupled with the support structure and engaging a bearing mounted to a spigot fitting on the fan case portion of the engine, wherein the spherical bearing resists the longitudinal force and the lateral force but allows for flexure of the support structure with respect to the engine.
9. The support structure of claim 1 , wherein the door is a cowl door, and each of the one or more door supports cooperates with the door to facilitate rotating the door between the open position and the closed position.
10. The support structure of claim 1 , wherein the door is a thrust reverser door, and each of the one or more door supports cooperates with the door to facilitate rotating the door between the open position and the closed position.
11. The support structure of claim 1 , wherein the door is a thrust reverser door, and each of the one or more door supports cooperates with the door to facilitate sliding the door between the open position and the closed position.
12. The support structure of claim 1 , wherein the upper component and the one or more door supports are each a carry-through structure that provides a side-to-side load path for the door.
13. The support structure of claim 1 , further including one or more fire seal depressor surfaces on the support structure, with each fire seal depressor surface being configured to contact and compress a fire seal when the door is closed.
14. The support structure of claim 1 , further including a fairing located on an upper surface of the upper component and configured to increase an aerodynamic efficiency of the support structure.
15. A support structure for a nacelle housing an engine, the nacelle being mounted on a pylon above a surface of an aircraft and including a door, the support structure comprising:
a lower component including—
a forward support coupled with the engine and configured to resist a longitudinal force and a vertical force;
an upper component including—
a fan case attachment configured to couple with a fan case of the engine and to resist the longitudinal force and a lateral force,
an aft support configured to couple with an aft portion of the engine and to resist the vertical force and the lateral force, and
one or more door supports configured to couple with the door and facilitate rotating the door between an open position and a closed position;
one or more fire seal depressor surfaces on the support structure, with each fire seal depressor surface being configured to contact and compress a fire seal when the door is in the closed position; and
a fairing located on an upper surface of the upper component and configured to increase an aerodynamic efficiency of the support structure,
wherein the support structure is located on the nacelle above the pylon.
16. A nacelle mounted on a pylon above a surface of an aircraft and configured to house an engine, the nacelle comprising:
a door;
a support structure located on the nacelle above the pylon and including—
a lower component including—
a forward support coupled with the engine and configured to resist a longitudinal force and a vertical force; and
an upper component including—
a fan case attachment configured to couple with a fan case portion of the engine and to resist the longitudinal force and the lateral force,
an aft support configured to couple with the an aft portion of the engine and to resist the vertical force and the lateral force, and
one or more door supports configured to couple with the door and facilitate moving the door between an open position and a closed position.
17. The nacelle of claim 16 , wherein the support structure is located on the nacelle opposite the pylon.
18. The nacelle of claim 16 , wherein the door is a cowl door configured to provide access to an interior of the nacelle.
19. The nacelle of claim 16 , wherein the door is a thrust reverser door configured to redirect an exhaust of the engine.
20. The nacelle of claim 16 , wherein the fan case attachment includes—
a forward fan case attachment configured to couple with a forward portion of the fan case portion of the engine; and
an aft fan case attachment configured to couple with an aft portion of the fan case portion of the engine.
21. The nacelle of claim 16 , wherein the forward fan case attachment includes one or more support links configured to resist the vertical force and the lateral force.
22. The nacelle of claim 21 , wherein the aft fan case attachment includes one or more adjustable links to resist the vertical force.
23. The nacelle of claim 22 , wherein the aft fan case attachment includes a spigot connection having a fitting containing a spigot pin coupled with the support structure and engaging a bearing mounted to a spigot fitting on the fan case portion of the engine, wherein the spherical bearing resists the longitudinal force and the lateral force but allows for flexure of the support structure with respect to the engine.
24. The nacelle of claim 16 , wherein the door is a cowl door, and each of the one or more door supports cooperates with the cowl door to facilitate rotating the cowl door between the open position and the closed position.
25. The nacelle of claim 16 , wherein the door is a thrust reverser door, and each of the one or more door supports cooperates with the door to facilitate rotating the door between the open position and the closed position.
26. The nacelle of claim 16 , wherein the door is a thrust reverser door, and each of the one or more door supports cooperates with the door to facilitate sliding the door between the open position and the closed position.
27. The nacelle of claim 16 , wherein the upper component and the one or more door supports are each a carry-through structure that provides a side-to-side load path for the door.
28. The nacelle of claim 16 , further including one or more fire seal depressor surfaces on the support structure, with each fire seal depressor surface being configured to contact and compress a fire seal when the door is closed.
29. The nacelle of claim 16 , further including a fairing located on an upper surface of the upper component and configured to increase an aerodynamic efficiency of the support structure.