Method for attachment of a pre-assembled powerplant and pylon assembly to an aircraft

A method for installing a pre-assembled combined powerplant and pylon assembly to a wing torque box of an aircraft, comprising:

• providing the pre-assembled combined power plant and pylon assembly;
• obtaining a first length of a first link attachable between a first attachment point on the pre-assembled combined powerplant and pylon assembly and a second attachment point on the wing torque box;
• obtaining a second length of a second link attachable between a third attachment point on the pre-assembled combined powerplant and pylon assembly and a fourth attachment point on the wing torque box;
• obtaining a first distance between the first attachment point on the pre-assembled combined powerplant and pylon assembly and the second attachment point on the wing torque box;
• obtaining a second distance between the third attachment point on the pre-assembled combined powerplant and pylon assembly and the fourth attachment point on the wing torque box;
• determining a first result by subtracting the first distance from the first length;
• determining a second result by subtracting the second distance from the second length;
• determining a third result by adding the first result and the second result;
• if the third result is less than or equal to zero, installing the first link between the first attachment point and the second attachment point and then installing the second link between the third attachment point and the fourth attachment point;
• and
• if the third result is greater than zero, installing the second link between the third attachment point and the fourth attachment point and then installing the first link between the first attachment point and the second attachment point.