- Hydraulic pump (hydraulic power generation) at 0.256 N2.

 - The Hydromechanical Unit (HMU) and the fuel pump at 0.423 N2.

 - The lubrication unit at 0.423 N2.

 - The ECU control alternator

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 Accessory Drive System Figure 001 (SHEET 1)
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 Accessory Drive System Figure 001 (SHEET 2)
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 E E Feb 01/98 E E ECES E INLET GEARBOX ASSEMBLY - DESCRIPTION AND OPERATION

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 1. General

_______ (Ref. Fig. 001) The inlet gearbox (IGB) assembly is located in the fan frame sump and is bolted to the forward side of the fan frame aft flange. The gearbox contains a horizontal bevel gear, a radial bevel gear, a core engine thrust (No. 3 ball) bearing, and a core engine roller bearing. The gearbox assembly serves as the mechanical coupling between the HPC rotor and the TGB.

 2. Description

___________
 A. Horizontal Bevel Gear The horizontal bevel gear, which has 47 teeth, is splined to the compressor rotor front shaft and secured to it by the No. 3 ball bearing locking nut. The horizontal bevel gear mates to the radial bevel gear to provide rotational torque to the transfer gearbox (TGB) assembly.
 B. Radial Bevel Gear The radial bevel gear, which has 35 teeth, is mounted on 2 roller bearings and one ball bearing (there are no duplex bearings). The gear is internally splined to accept the radial drive shaft which is removable from the exterior of the engine to allow individual replacement of the IGB and TGB.
 C. Thrust Bearing (No. 3 Ball) The No. 3 ball bearing is installed during IGB assembly between the gearbox housing and the horizontal bevel gear. It provides axial positioning of the forward end of the high pressure compressor (HPC) rotor.
 D. Roller Bearing (No. 3 Roller) The No. 3 roller bearing is installed during IGB assembly between the gearbox housing and the horizontal bevel gear. It positions the core engine rotor radially.
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 Inlet Gearbox Assembly
 Figure 001

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 TRANSFER GEARBOX ASSEMBLY - DESCRIPTION AND OPERATION

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 1. General
_______ (Ref. Fig. 001) The transfer gearbox (TGB) provides power transmission between the inlet gearbox (IGB) and the accessory gearbox (AGB). It consists of the following major assemblies:
 - Radial drive shaft assembly.

 - TGB assembly.

 2. Description
___________
 (Ref. Fig. 002, 003)

 A. Radial Drive Shaft Assembly The radial drive shaft (RDS) assembly is installed inside the fan frame No. 7 strut at the 6 o'clock position. It consists of the radial drive shaft and the shaft midlength bearing.
 (1) The radial drive shaft is made of steel alloy. It is hollow and measures approximately 29.52 in. (0.75 m). Both ends are externally splined and connect the IGB bevel gear and the TGB input bevel gear. A foolproof slot is machined on the shaft to avoid inversion of RDS during installation.

 (2) The shaft midlength bearing provides proper centering of radial drive shaft in its housing. Its inner race is mounted half-way up on the RDS and the outer race is part of the radial drive shaft housing.

 B. TGB Assembly
 The TGB assembly is installed under the fan frame at the 6 o'clock
 position. It consists of the housing and a set of 2 bevel gears.

 (1) The TGB housing is made of two aluminum alloy castings bolted together. It is secured to the fan frame through a single clevis/link rod mounting arrangement located at the upper part of the TGB housing front end. The upper part of the TGB housing contains an adapter which corresponds to an adapter mounted on the fan frame. The TGB housing accommodates 3 oil nozzles for lubrication of the bevel gears and the bearings. The casting of the TGB housing is double-walled, to provide better oil scavenge.

 (2) The upper part of the TGB houses the input bevel gear, its bearing housing, ball bearing, and roller bearing. The bore of the bevel gear is splined at its upper end and connects with the radial drive shaft. An oil distributor installed inside the bevel gear and secured by a Spirolock system, ensures oil distribution and axial retention of the radial drive shaft.
　
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