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Angle Gearbox
The AGB attaches to the bottom of the intermediate case. The HPC shaft turns the AGB with a vertical shaft (tower shaft). The AGB turns the MGB gears with a horizontal shaft (lay shaft).
Components on the Main Gearbox
These components are on the front of the MGB:
*
Fuel pump/fuel metering unit (FMU)

*
N2 crank pad

*
HPC drive shaft housing

*
Permanent magnet alternator (PMA)

*
Backup generator

*
Deoiler

*
Main oil filter housing.

Training Information Point
The N2 crank has a small cover and a large cover. You remove the small cover to use the N2 crank. You must not remove the large cover. If you remove and then install the large cover, you can damage the oil pump idler gear bearing.
EFFECTIVITY BEJ ALL  72-00-00 
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ENGINE -MAIN AND ANGLE GEARBOX -COMPONENT LOCATIONS

EFFECTIVITY BEJ ALL  72-00-00 
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ENGINE -MAIN GEARBOX -AFT -COMPONENT LOCATIONS

Main Gearbox Components
These components are on the rear of the MGB:
*
Oil tank adapter cover

*
Integrated drive generator (IDG)

*
Lube and scavenge pump

*
Pneumatic starter

*
Hydraulic pump.

EFFECTIVITY BEJ ALL  72-00-00 
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ENGINE -MAIN GEARBOX -AFT -COMPONENT LOCATIONS

EFFECTIVITY BEJ ALL  72-00-00 
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ENGINE -BORESCOPE ACCESS PORTS

General
You can inspect internal engine parts with a borescope inserted through borescope ports.
Manual Engine Turning
BEJ ALL POST SB 777-71-0032
There are eight borescope ports on each side of the engine. You must turn the LP and HP shafts to see all the compressor or turbine blades.
BEJ ALL
There are nine borescope ports on the left side of the engine. There are eight borescope ports on the right side of the engine. You must turn the LP and HP shafts to see all the compressor or turbine blades.
You manually turn the fan to turn the N1 shaft.
You manually turn the N2 shaft at the N2 crank pad on the front of the main gearbox. You can also use a pneumatic or electric motor to turn the N2 crank.
Borescope Access Port Identification -Left Side
Numbers identify borescope access ports (AP). These are the borescope access ports and their inspection areas:
*
AP-1 (LPC 4th stage)

*
AP-2 (HPC 5th and 6th stages)

*
AP-3 (HPC 6th and 7th stages)

*
AP-4 (HPC 8th and 9th stages)

*
AP-5 (HPC 10th and 11th stages)
　
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