Engine RH Side
Figure 002
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Engine Schematic
Figure 003
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Major External Dimensions
Figure 004
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C. Fan Frame The fan frame is one of the major structural and aerodynamic components of the engine. Aerodynamically the fan frame forms the inner and outer flow passage of the fan airstream as well as the core airstream. Structurally, it carries inlet cowl loads, supports the fan casing, the two fan bearings and the core engine forward bearing; it contains the forward engine mount, it houses the accessory drive power take off gearbox and radial drive shaft; it contains the variable bypass valves between the booster and high pressure compressor; it supports the transfer and accessory gearboxes; and provides the mounting surfaces for fan-stream acoustic panels. The fan frame also serves as the forward support for the compressor.
D. Compressor Rotor The compressor is a nine stage axial flow assembly. The rotor consists of the stage 1 and 2 discs which form a spool, a separately attached stage 3 disc and a spool containing stage 4 - 9 discs. Stage 1, 2 and 3 have axial dovetail slots and stage 4 - 9 blades are retained in circumferential slots. All blades are individually replaceable without spool disassembly.
E. Compressor Stator All 9 stages of the compressor stator are shrouded. The Inlet Guide Vanes (IGV) and the first 3 stages of the compressor are variable. The casing is composed of two semi cylindrical halves, permitting a quick access to the core engine compressor.
F. Combustor A step diffuser is incorporated upstream of the combustor for reduction of the combustor sensitivity to the compressor velocity profile. The combustor can be replaced without disturbing the fuel nozzles. The combustor casing provides structural support for the combustor, the compressor Outlet Guide Vanes (OGV) the High Pressure (HP) stator and shrouds, and the seals for Compressor Discharge Pressure (CDP).
G. High Pressure Turbine The High Pressure Turbine (HPT) is an air cooled single stage high energy turbine. Rotor blades are individually replaceable without the need for rotor disassembly or rebalancing.
H. Low Pressure Turbine The Low Pressure Turbine (LPT) consists of 4 and half stages of blades and vanes. The first stage nozzle vane is cooled and provides cooling air for the high pressure and low pressure turbine discs. The LPT drives the fan rotor through the inner concentric shaft and is aerodynamically coupled to the high pressure system. The LPT casing is a 360 degrees design to provide structural continuity.
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J. Turbine Frame The turbine frame is located aft the LPT. It contains the aft LPT bearing, and supports the primary exhaust system. It contains the engine rear mount fitting.
K. Accessories and Accessory Drives Engine and aircraft accessories are mounted on the accessory gearbox which is located on the outside of the lower part of the casing and driven through a radial shaft at 6 o'clock position. Power for the engine and aircraft accessories is extracted from the HPC rotor shaft through an inlet gearbox and the radial drive shaft. Quick Attach/Detach (QAD) accessory mounting flanges are provided for the engine accessories.
3. Bearings and Seals__________________ (Ref. Fig. 005, 006, 007)
A. Bearings The engine rotors are supported by bearings installed in the sump cavities provided by the two frames. The forward sump is in the fan frame and is the location of bearings No. 1, No. 2 (fan/booster shaft) and No. 3 (HP shaft forward part). The aft sump is in the turbine rear frame where are bearings No. 4 (HP shaft aft part) and No. 5 (LP shaft aft part).
B. Oil Distribution The bearings must be lubricated and oil is distributed to these components by nozzles. However, the oil must be retained within the engine, so seals of various types are provided to confine the oil and direct its recirculation.
C. Seals Arrangement The arrangement of oil and air seals, the provisions for oil supply, oil scavenge, seal pressurization, sump vent subsystems produce a system known as a dry sump. Engine sumps are vented to ambient pressure through the "center-vent" tube which is contained in the LP shaft.
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