(2) The horizontal drive shaft is retained in the AGB handcranking driving gear by a castellated nut in the gearshaft.
B. AGB Housing
(1) The AGB housing is an aluminum alloy casting. It is mounted under the fan case by 2 clevis mounts with shouldered bushings.
(2) The AGB housing front face has mounting pads for the following accessories and equipment.
(a) Lubrication unit.
(Ref. Fig. 002)
(b) Hydraulic pump.
(Ref. Fig. 002)
(c) Handcranking drive.
(Ref. Fig. 004)
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Accessory Gearbox Module
Figure 001
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Accessory Gearbox Module-Section
Figure 002
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Accessory Gearbox Module-Section at N2 Speed Sensor Location
Figure 003
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Accessory Gearbox Module-Section at Control Alternator and Handcranking Drive
Locations
Figure 004
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R AGB Module - Detail of the Optional Seal Configurations Figure 005
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AGB Module - Detail of Starter Drive Pad Magnetic Seal Configuration
Figure 006
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(d) Integrated drive generator (IDG).
(Ref. Fig. 002)
(e) Control alternator (FADEC power supply).
(Ref. Fig. 004)
(3) The AGB housing rear face connects with the horizontal drive shaft housing and has mounting pads for the following equipment :
(a) Fuel pump/HMU package.
(Ref. Fig. 002)
(b) Starter.
(Ref. Fig. 002)
(c) N2 speed sensor (Ref. Fig. 003) The N2 speed sensor is installed on AGB ; the air gap adjustment is obtained by laminated shims bolted on the AGB housing. Electrical are used by ECU and N2 cockpit indicator.
C. Gear Train
(Ref. Fig. 002)
(1) The gear train is contained within the AGB housing and drives the accessories.
(2) Each gearshaft and its bearings and bearing support is a plug-in type assembly.
(3) Sealing past four of the AGB drive pads (IDG, hydraulic pump, starter and fuel pump) is provided by two (optional) configurations of carbon-contact seals. There are:
- Magnetic-type carbon seal,or
- Sealol-type carbon seal.
(a) Magnetic-type seal. (Ref. Fig. 005) This seal consists of: a non-magnetic seal housing which houses a magnetized mating ring with a polished face and a retaining ring. a rotating seal, which has a carbon seal held in a rotating ring. This seal configuration (Ref. Fig. 005) (detail K) can be used only for sealing past the drive pads which follow:
- Hydraulic pump
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- Fuel pump On the starter and IDG drive pads only, a different configuration of magnetic-type seal is used (Ref. Fig. 006) (detail B). This seal differs in that a thrust ring, which also acts as a thermal "exchanger", is added between the mating ring and the retaining ring.
(b) Sealol-type seal. (Ref. Fig. 005) (detail L) The Sealol seal is made of a carbon packing and a rotating mating ring with a polished face. The rotating mating ring has 4 lugs that engage in 4 corresponding slots in the gearshaft on bearing. A housing containing a spring-loaded carbon seal ensures constant contact between the polished face of the rotating mating ring and the carbon seal element. This seal configuration can be used for sealing past the drive pads wich follow: IDG Hydraulic pump Starter Fuel pump
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