Installation of Turbofan Engines

in Engine Removal and Replacement

Installation With Dolly

The following procedures are typical of those used to install a turbofan engine using a dolly. Specific ground-handling instructions are normally placarded on the dolly.


1. Operate the dolly and carefully raise the engine to the engine mount attaching fittings.

2. Align the rear engine mount with the mount attaching fittings.

3. Install the engine mount bolts and tighten to the specified torque.

Installation with Cable Hoist

Figure 8-21 shows an engine being installed using a cable hoist. Hoists of this type are commonly used to install turbofan engines.

Figure 8-21. Hoisting a typical turbine fan (Boeing).

Figure 8-21. Hoisting a typical turbine fan (Boeing).

1. Position the powerplant beneath the nacelle.

2. Attach the engine sling to the engine.

3. Carefully operate all the hoists simultaneously to raise the engine and guide the mounts into position.

Completing the Installation The following procedures cover the typical final installation instructions:

1. Install the bushing through the engine rear mount and the rear mount attaching fitting. Install the bolt through the bushing; install the nut and secure it with a cotter pin.

2. Through the forward mount accesses, place the chamfered washer, flat washer, and nut on each engine forward mount bolt. Tighten the nut to the required torque and safety.

3. Connect the pneumatic ducts from the pylon to the compressor bleed-air duct from the engine. Tighten the duct connection by applying the proper torque.

4. Remove the dolly or slings and related equipment from the engine.

5. Connect the fuel hose to the fuel line from the pylon. Use a new gasket between the flanges of the fuel hose and the line.

6. Sparingly apply anti-seize compound to the threads of the electrical harness receptacle and adjacent thermocouple receptacles. Connect the leads and secure the harness connector and safety.

7. Connect the turbine control connections, electrical and pneumatic.

8. Connect the power control rod to the fuel control or the electrical connection for this purpose.

9. Inspect the engine installation for completeness.

10. Install the access covers.

11. Adjust the fuel control linkage and trim