Transmission Flashcards

1
Q

What is the purpose of the transmission? (2)

A
  • Takes combined power from the 2 engines, reduce the rpm, and transfer it to the main and tail rotors
  • Secondary purpose is to provide a drive for electrical and hydraulic power generation
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2
Q

What are the components?

A

Main transmission modules, tail rotor drive shaft, oil cooler, IGB, and TGB

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3
Q

How many tail drive shafts?

A

6

Ballistically tolerant shafts suspended by 4 viscous-damped bearings

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4
Q

What are the modules of the MGB? (5)

A
  • 2 Accessory Modules
  • 2 Input Modules
  • Main Module
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5
Q

What design and tilt does the MBG have?

A

Modular design with 3 degree forward tilt

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6
Q

Can the MGB oil filter be bypassed?

A

Yes

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7
Q

What is the purpose of the Input Module?

A
  • To support the front of the engines

- Provide 1 gear reduction between the engines and main module

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8
Q

Components of the Input Module? (2)

A

Input bevel-pinion gear and Freewheeling Unit

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9
Q

What does the Freewheeling Unit provide?

A

Allows the engine to be disengaged from transmission when Nr > Np (auto)

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10
Q

What is the Engine Output Shaft do?

A

Provides drive from engine input module via diaphragm coupling.

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11
Q

What does the Diaphragm Coupling do?

A

Allows for slight misalignment of output shaft

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12
Q

What is the indication of a failing Diaphragm Coupling?

A

A loud or abnormal whining noise

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13
Q

What is the purpose of the Accessory Module

A

Provides mounting and drive for the generators and hydraulic pumps

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14
Q

Where is the Nr sensor for VIDS located?

A

Right Accessory Module

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15
Q

Where is the Nr sensor for TDI and the low pressure oil sensors located?

A

Left Accessory Module

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16
Q

What is the purpose of the IGB?

A

Base of tail pylon and reduces shaft speed from MGB to TGB and changes angle of drive

17
Q

What type of lubrication does the IGB/TGB have?

A

Splash lubricated

18
Q

What is the purpose of the TGB?

A

Top of tail pylon and drives and mounts the Tail rotor, changes angle of drive and provides gear reduction

19
Q

What is the tilt of the TGB?

A

20 degree left tilt