Aircraft engine attachment assembly
An aircraft propulsion system configured to be supported from an aircraft wing having a leading edge and opposing upper and lower surfaces. The aircraft propulsion system broadly comprises an engine having a core, a fan case, and a nacelle including a plurality of access panels, and an attachment assembly for securing the engine to the aircraft wing. The attachment assembly broadly comprises an upper support section including a number of spars and a number of ribs connected between the spars, a lower support section, and an aft section. The attachment assembly aerodynamically melds the nacelle and the aircraft wing together via the upper support section so that air flowing over the engine flows over the aircraft wing along the upper surface and air flowing laterally alongside the nacelle flows under the aircraft wing along the lower surface.
1. An attachment assembly for supporting an engine from an aircraft wing having a leading edge and opposing upper and lower surfaces, the engine having a core, a fan case, and a nacelle, the attachment assembly comprising:
an upper support section connected to the fan case, the upper support section including:
a plurality of spars spaced laterally from each other and extending longitudinally from the aircraft wing to the fan case; and
a plurality of laterally extending ribs connected between the plurality of spars; and
a lower support section connected to the core,
the attachment assembly aerodynamically melding the nacelle and the aircraft wing together via the upper support section so that air flowing over the engine flows over the aircraft wing along the upper surface and air flowing laterally alongside the nacelle flows under the aircraft wing along the lower surface;
the plurality of spars comprising three spars laterally spaced apart along an arc, each of the three spars spanning longitudinally from the wing to the fan case.
2. The attachment assembly of claim 1 , the upper support section being at least partially formed of composite material.
3. The attachment assembly of claim 1 , the upper support section having a width greater than its height.
4. The attachment assembly of claim 1 , the upper support section further comprising opposing left and right strakes configured to aerodynamically meld the upper support section and the leading edge together to smoothly divide air flowing over the engine and air flowing laterally alongside the nacelle.
5. The attachment assembly of claim 1 , further comprising an aft section including an aerodynamic fairing positioned below the lower surface of the wing to minimize fan duct airflow drag.
6. The attachment assembly of claim 5 , the aft section further including a heat shield below the aerodynamic fairing to mitigate turbine engine exhaust impingement on the aerodynamic fairing.
7. The attachment assembly of claim 6 , further comprising an additional heat shield adjacent the lower surface of the wing to mitigate turbine engine exhaust impingement on the wing.
8. The attachment assembly of claim 1 , further comprising a vent extending through the upper support section, the vent being configured to direct fan duct airflow over the aircraft wing along the upper surface.
9. The attachment assembly of claim 1 , further comprising a reverse thrust vent extending through the upper support section, the reverse thrust vent being configured to redirect fan duct airflow at least partially in a direction countering movement of the aircraft wing.
10. The attachment assembly of claim 1 , the lower support section including a bifurcation fairing for directing fan duct airflow laterally alongside the lower support section.
11. An aircraft propulsion system configured to be supported from an aircraft wing having a leading edge and opposing upper and lower surfaces, the aircraft propulsion system comprising:
an engine having a core, a fan case, and a nacelle including a plurality of access panels; and
an attachment assembly for securing the engine to the aircraft wing, the attachment assembly comprising:
an upper support section connected to the fan case, the upper support section including:
a plurality of spars spaced laterally from each other and extending longitudinally from the aircraft wing to the fan case; and
a plurality of laterally extending ribs connected between the plurality of spars;
a lower support section connected to the core;
a vent extending through the upper support section, the vent being configured to direct fan duct airflow over the aircraft wing along the upper surface; and
a reverse thrust vent extending through the upper support section, the reverse thrust vent being configured to redirect fan duct airflow at least partially in a direction countering movement of the aircraft wing,
the plurality of access panels being pivotably connected to the attachment assembly,
the attachment assembly aerodynamically melding the nacelle and the aircraft wing together via the upper support section so that air flowing over the engine flows over the aircraft wing along the upper surface and air flowing laterally alongside the nacelle flows under the aircraft wing along the lower surface;
the plurality of spars comprising three spars laterally spaced apart along an arc, each of the three spars spanning longitudinally from the wing to the fan case.
12. The aircraft propulsion system of claim 11 , the upper support section being at least partially formed of composite material.
13. The aircraft propulsion system of claim 11 , the upper support section having a width greater than its height.
14. The aircraft propulsion system of claim 11 , the upper support section further comprising opposing left and right strakes configured to aerodynamically meld the upper support section and the leading edge together to smoothly divide air flowing over the engine and air flowing laterally alongside the nacelle.
15. The aircraft propulsion system of claim 11 , the attachment assembly further comprising an aft section including an aerodynamic fairing positioned below the lower surface of the wing to minimize fan duct airflow drag.
16. The aircraft propulsion system of claim 15 , the aft section further including a heat shield below the aerodynamic fairing to mitigate turbine engine exhaust impingement on the aerodynamic fairing.
17. The aircraft propulsion system of claim 16 , the attachment assembly further comprising an additional heat shield adjacent the lower surface of the wing to mitigate turbine engine exhaust impingement on the wing.
18. The aircraft propulsion system of claim 11 , the lower support section including a bifurcation fairing for directing fan duct airflow laterally alongside the lower support section.
19. The aircraft propulsion system of claim 11 , the upper support section having a width between approximately 50 percent and approximately 70 percent of a width of the engine.
20. An aircraft propulsion system configured to be supported from an aircraft wing having a leading edge and opposing upper and lower surfaces, the aircraft propulsion system comprising:
an engine having a core, a fan case, and a nacelle including a plurality of access panels; and
an attachment assembly for securing the engine to the aircraft wing, the attachment assembly comprising:
an upper support section connected to the fan case and being at least partially formed of composite material, the upper support section having a width greater than its height and including:
a plurality of spars spaced laterally from each other and extending longitudinally from the aircraft wing to the fan case;
a plurality of laterally extending ribs connected between the plurality of spars; and
opposing left and right strakes configured to aerodynamically meld the upper support section and the leading edge together to smoothly divide air flowing over the engine and air flowing laterally alongside the nacelle;
a lower support section connected to the core;
a vent extending through the upper support section, the vent being configured to direct fan duct airflow over the aircraft wing along the upper surface; and
a reverse thrust vent extending through the upper support section, the reverse thrust vent being configured to redirect fan duct airflow at least partially in a direction countering movement of the aircraft wing,
the upper support section having a width between approximately 50 percent and approximately 70 percent of a width of the engine,
the plurality of access panels being pivotably connected to the attachment assembly,
the attachment assembly aerodynamically melding the nacelle and the aircraft wing together via the upper support section so that air flowing over the engine flows over the aircraft wing along the upper surface and air flowing laterally alongside the nacelle flows under the aircraft wing along the lower surface;
the plurality of spars comprising three spars laterally spaced apart along an arc, each of the three spars spanning longitudinally from the wing to the fan case.