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An engine installation system includes two aftward members and two forward members. Each member is connected to a different bootstrap on one end and has a pivotable connection to a pylon on the other end. There is a link that connects one forward member with one aftward member, and another link that

An engine installation system includes two aftward members and two forward members. Each member is connected to a different bootstrap on one end and has a pivotable connection to a pylon on the other end. There is a link that connects one forward member with one aftward member, and another link that connects the other forward member with the other aftward member. There is a variable-length member connected to the bootstrap-end of each of the two aftward members, with each of the variable-length members having a pivotable connection to the pylon.

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1. An engine installation system comprising: a first bootstrap;a first forward member connected to the first bootstrap at a first end and having a second end for pivotable connection to a pylon;a second bootstrap;a second forward member connected to the second bootstrap at a first end and having a s

1. An engine installation system comprising: a first bootstrap;a first forward member connected to the first bootstrap at a first end and having a second end for pivotable connection to a pylon;a second bootstrap;a second forward member connected to the second bootstrap at a first end and having a second end for pivotable connection to the pylon;a third bootstrap;a first aftward member connected to the third bootstrap at a first end and having a second end for pivotable connection to the pylon;a fourth bootstrap;a second aftward member connected to the fourth bootstrap at a first end and having a second end for pivotable connection to the pylon;a first link connected to the second forward member and to the second aftward member;a first variable-length member connected at a first end of the first aftward member and having a second end for a pivotable connection to the pylon; anda second variable-length member connected at a first end to the second aftward member and having a second end for pivotable connection to the pylon. 2. The engine installation system of claim 1, wherein the first and second bootstraps comprise a tension member such as a chain or a cable. 3. The engine installation system of claim 1, wherein each of the variable-length members comprises a manual crank. 4. The engine installation system of claim 1, wherein the first forward member comprises: an arm connected to the first bootstrap at the first end of the first forward member;a mount connected to the pylon at the second end of the first forward member; anda hinge connecting the arm to the mount that allows the arm to pivot with respect to the pylon, the hinge being oriented substantially vertically. 5. The engine installation system of claim 1, wherein each of the second ends of the aftward and variable-length members includes a rod end bearing. 6. The engine installation system of claim 1, further comprising: a third aftward member connected to the third bootstrap at a first end and having a second end for pivotable connection to the pylon; anda fourth aftward member connected to the fourth bootstrap at a first end and having a second end for pivotable connection to the pylon. 7. The engine installation system of claim 6, further comprising: a first knuckle that is connected to the third bootstrap and to the first ends of the first and third aftward members; anda second knuckle that is connected to the fourth bootstrap and to the first ends of the second and further aftward members. 8. A system comprising: a pylon;an engine;a cradle connected to the engine;a trolley for supporting and positioning the cradle and the engine below a wing; andan engine installation system mounted to the pylon and connected to the cradle, to vertically move the engine into a preliminary raised position with respect to the pylon, and to horizontally move the engine from the preliminary raised position into a final mounting position with respect to the pylon, wherein the engine installation system comprises: a first bootstrap;a first forward member connected to the first bootstrap at a first end and having a second end for pivotable connection to the pylon;a second bootstrap;a second forward member connected to the second bootstrap at a first end and having a second end for pivotable connection to the pylon;a third bootstrap;a first aftward member connected to the third bootstrap at a first end and having a second end for pivotable connection to the pylon;a fourth bootstrap;a second aftward member connected to the fourth bootstrap at a first end and having a second end for pivotable connection to the pylon;a first link connected to the first forward member and to the first aftward member;a second link connected to the second forward member and to the second aftward member;a first variable-length member connected at a first end to the first award member and having a second end for pivotable connection to the pylon. 9. The system of claim 8, wherein the first and second bootstraps comprise a tension member such as a chain or a cable. 10. The system of claim 8, wherein the first forward member comprises: an arm connected to the first bootstrap at the first end of the first forward member;a mount connected to the pylon at the second end of the first forward member; anda hinge connecting the arm to the mount that allows the arm to pivot with respect to the pylon, the hinge being oriented substantially vertically. 11. The system of claim 8, wherein each of the second ends of the aftward and variable-length members includes a rod end bearing. 12. The system of claim 8, wherein the engine installation system further comprises: a third aftward member connected to the third bootstrap at a first end and having a second end for pivotable connection to the pylon; anda fourth aftward member connected to the fourth bootstrap at a first end and having a second end for pivotable connection to the pylon. 13. The system of claim 8, wherein the engine installation further comprises: a first knuckle that is connected to the third bootstrap and to the first ends of the first and third aftward members; anda second knuckle that is connected to the fourth bootstrap and to the first ends of the second and fourth aftward members. 14. A method of installing an engine onto a pylon of a wing using an engine installation system comprising: a first bootstrap, a first forward member connected to the first bootstrap at a first end and having a second end for pivotable connection to a pylon, a second bootstrap, a second forward member connected to the second bootstrap at a first end and having a second end for pivotable connection to the pylon, a third bootstrap, a first aftward member connected to the third bootstrap at a first end and having a second end for pivotable connection to the pylon, a fourth bootstrap, a second aftward member connected to the fourth bootstrap at a first end and having a second end for pivotable connection to the pylon, a first link connected to the second forward member and to the second aftward member, a first variable-length member connected at a first end of the first aftward member and having a second end for a pivotable connection to the pylon, and a second variable-length member connected at a first end to the second aftward member and having a second end for pivotable connection to the pylon; the method comprising: attaching an installation system to the pylon;attaching the installation system to a cradle, the cradle being attached to the engine;raising the cradle and the engine substantially vertically;moving the installation system, the cradle, and the engine substantially horizontally aftward to position the engine in a final mounting position with respect to the pylon; andattaching the engine to the pylon. 15. The method of claim 14, further comprising: detaching the cradle from the engine; anddetaching the cradle from the installation system. 16. The method of claim 14, further comprising: detaching the engine installation system from the pylon. 17. The method of claim 14, further comprising: moving a trolley below the wing, the trolley including a cradle that is connected to the engine.