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Following is a simplified look at some of the features
of a large turbofan engine and the way it is put together.
The example chosen is the Trent 800, which powers the
Boeing 777 airliner.
The RB211 family, to which the Trent belongs, features
modular construction in its design. That is to say,
it is built up from a number of large assemblies known
as ‘modules’, each of which has its individual
identity and service history.
The Trent 800 is built-up from eight basic modules:
- Module 01 LP compressor rotor, (to which the fan
blades are fitted)
- Module 02 IP compressor
- Module 03 Intermediate case
- Module 04 HP system
- Module 05 IP turbine
- Module 06 High speed gearbox
- Module 07 LP compressor case
- Module 08 LP turbine
Modules 01, 02, 03, 04, 05 and 08 form the core engine
which can be replaced as a complete assembly.
Various items and systems are then added to complete
the engine. Significant benefits are gained from modular
construction:
- Decreased turn-round time for repair
- Lower overall maintenance costs
- Reduced spare engine holdings
- Maximum life achieved from each module
- Savings on transport costs
- Ease of transport and storage
- On-wing test capability after any module change
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