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550 unclass > 06 - System: Transmissions > Flashcards

06 - System: Transmissions Flashcards

1
Q

Power Transmission: What is the purpose of the main transmisison assembly?

A

Transmits engine power to the rotor, while reducing the output speed and changing the direction of drive ~90°

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.1)

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2
Q

Power Transmission: How is the Main Gear Box mounted to the airframe?

A

Flexibly, and moves in relation to the airframe in flight.

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.2.1)

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3
Q

Power Transmission: How is the Main Gear Box mounted to the engine?

A

Rigidly, through the housing and barrel junction assembly.

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.2.1)

Explanation: The engine has to be rigidly mounted to the MGB, since this is flexibly mounted to the airframe.

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4
Q

Power Transmission: What is the purpose of the flexible cuplings in the power transmission from engine to Main Gear Box?

A

To compensate for small misalignments between the engine and MGB.

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.2.1)

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5
Q

Power Transmission: What is the purpose of the Main Gear Box?

A

Transmits engine torque to the main rotor

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.3)

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6
Q

Power Transmission: How many RPM does the transmission input receive from the engine?

A

6125 RPM

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.3.1)

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7
Q

Power Transmission: What gears does the main gear box consist of?

A
  • Epicyclic (planetary) reduction gear
  • Bevel reduction gear

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.3.1)

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8
Q

Power Transmission: Regarding the Main Gear Box, what is the purpose of the bevel gear?

A
  • Recieves the engine power input and changes direction ~ 90°
  • Reduces by a ratio of 61 / 17 = 3.59
  • Drives the Epicyclic Sun gear

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.3.1)

(6125 RPM -> 1706 RPM)

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9
Q

Power Transmission: Regarding the Main Gear Box, what is the purpose of the Epicyclic gear?

A
  • Planet gears, driven by sun gear, spins along a fixed ring gear, and drives the planet gear cage -> Drives the rotor
  • Further reduces by a ratio of 4.33

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.3.1)

1706 RPM -> 394 RPM

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10
Q

Power Transmission: What is the purpose of the Main Gear Box Oil System?

A
  • Lubrication
  • Cooling

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.3.3)

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11
Q

Power Transmission: What happens in case of low oil quantity (or wrong lubrican being used) ?

A
  • Increase of stress on gears, resulting in fatigue and eventually failure
  • Increased friction and temperature, leading to bearing seizure above a certain temp.

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.3.4.1)

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12
Q

Power Transmission: When does the MGB T light illuminate?

A

MGB temp above 115°C

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.3.4.2)

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13
Q

Power Transmission: When does the MGB P light illuminate?

A

MGB oil pressure below 1 bar

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.3.4.2)

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14
Q

Power Transmission: What is the purpose of the Rotor Brake?

A
  • Stop rotor quickly
  • Prevent from turning when parked

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.4)

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15
Q

Power Transmission: What is the time interval between two rotor brakings?

A

5 minutes

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.4.2)

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16
Q

Power Transmission: When does the MGB CHIP light illuminate?

A

When enough metallic particles have built up on the magnetic chip detector, thus closing the circuit.

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.4.2)

17
Q

Power Transmission: How is the Main Gear box oil cooled?

A
  • By the motor driven oil cooler, installed in the air duct.
  • Oil pump driven by the gear box

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.3.4.2)

18
Q

Power Transmission: What determines whether the MGB oil is being cooled?

A

The engine oil temperature.

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.3.4.2)

19
Q

Power Transmission: What does the relief valve do?

A
  • Opens during cold weather starting when the MGB oil pressure reaches 6.5 bar.
  • The quantity of oil to oil cooler is reduced and temperature increases quickly.

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.3.4.2)

20
Q

Power Transmission: Why is the MGB attached flexibly to the structure?

A

To absorb vibrations

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.5.1)

21
Q

Power Transmission: How is the mast attached to the helicopter?

A

By 4 rigid bars that transfer lift from the rotor to the structure

(Instruction Manual - Basic 1 - Main Systems, Chapter 3, Paragraph 3.5.1)

22
Q

Tail Transmission: What are the components comprising the tail transmission system?

A
  1. Tail Rotor Gear Box
  2. Tail Rotor drive shaft
  3. Forward drive shaft

(Instruction Manual - Basic 1 - Main Systems, Chapter 5, Paragraph 5.1)

23
Q

Tail Transmission: What is the oil capacity of the tail gear box?

A

0.33 L (Soda can)

(“Dash-1”, FM CH7.0, Paragraph 6)

24
Q

Tail Transmission: How is the Tail Rotor Gear Box lubricated and cooled?

A
  • Splash lubrication
  • Heat developed in lubrication is fully dissipated by radiation from housing.

(Instruction Manual - Basic 1 - Main Systems, Chapter 5, Paragraph 5.3.2)

550 unclass (19 decks)

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