TRAINING INFORMATION POINTS (TIP) -INTRODUCTION
The power plant has many line replaceable units (LRUs). But, the power plant itself is an LRU. There are several procedures with related equipment that apply to the power plant as an LRU. These are the items in this training information points (TIP) section:
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Power plant removal and installation
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Thrust reverser hold-open equipment (engine removed)
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Engine disconnects
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Bootstrap equipment
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Engine mounts
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Engine drains
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System tests.
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TRAINING INFORMATION POINTS (TIP) -INTRODUCTION
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
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TIP -POWER PLANT REMOVAL AND INSTALLATION
The removal and installation of a power plant is a long task. Many special tools and equipment are necessary.
This is a summary of the data necessary to remove and install an engine:
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Preparation
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Ground Handling Adapters
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Bootstrap Equipment
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Engine Cradle
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Engine Mounts
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Transportation Stand
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Power Plant Removal
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Power Plant Installation
Preparation
Many procedures must be done to make it safe to remove and install the power plant. This is a summary of the procedures:
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Electrically ground the airplane
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Level the airplane
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Close the engine fuel valve and engine fuel spar valve
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Depressurize the pneumatic system
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Depressurize the hydraulic system
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Close the engine driven pump supply shutoff valve
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Retract the leading edge slats
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Deactivate the leading edge slats
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Deactivate the thrust reverser.
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You can remove the inlet cowl before you remove the engine or leave it on the engine.
You must remove the fan cowls before you remove the engine. They attach to the fan cowl support beam which attaches to the engine.
You must open the thrust reverser halves before you remove the engine. You do not remove them for an engine change. The thrust reverser halves attach to the strut. Special hold-open equipment is necessary to keep the thrust reverser halves open.
With the thrust reverser hold-open equipment installed, you disconnect all of these types of connections between the engine and the strut:
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Electrical
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Hydraulic
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Pneumatic
