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Rotary Wing > Last Few Weeks > Flashcards

Last Few Weeks Flashcards

1
Q

What are the two ways that bearings can be categorized?

A

Shape or Function

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2
Q

What is the purpose of a bearing?

A

Allows for movement under load

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3
Q

What are the types of bearings?

A

Ball Bearing Roller Bearing Tapered Roller Spherical Bearing

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4
Q

Ball Bearings take what kind of load?

A

Radial+Axial (Thrust) loads

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5
Q

Roller Bearings take what kind of load?

A

Radial only

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6
Q

Tapered Roller Bearings take what kind of load?

A

Radial + Thrust Loads

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7
Q

_________ bearings are used for control linkages

A

Spherical

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8
Q

Spherical Bearings are installed through a process called __________ _____________ through the use of a roller stake

A

Roller Staking

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9
Q

________ : 2 bearings back to back

A

Duplex

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10
Q

What should you never do to clean bearings?

A

Spin using shop air

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11
Q

_____ are used to transmit power, change directions, increase/decrease speed

A

Gears

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12
Q

What are the different types of gears?

A

Straight tooth, helical, spiral bevel gears

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13
Q

______ Gears change direction by 90 degrees

A

Bevel

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14
Q

______ ____________ ____________ delivers engine torque to the MR driveshaft

A

Main Gearbox Transmission

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15
Q

What are the other purposes of the main gearbox transmission?

A

Reduce Engine RPM Transfer lift from the MR blades to the airframe

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16
Q

How many stages of gear reduction are there always on helicopters?

A

Two

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17
Q

Planetary Gears provide _______ gear reduction

A

Inline

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18
Q

What are the green gears called?

A

Planets

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19
Q

What is the gear coloured yellow called?

A

Sun Gear

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20
Q

What is the Purple gear called?

A

Ring Gear

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21
Q

Piston power helicopter transmissions need a _______

A

Clutch

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22
Q

The purpose of a clutch is to start the ________ first

A

Engine

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23
Q

What do the Engine to Main Gear Box driveshafts do?

A

Transfers torque from engine to MGB

Corrects for misalignment and movement of the transmission

24
Q

Shaft arrangements require what type of lubrication?

A

Hand packed 204 grease

25
Q

What is placed on couplings to warn of an overheating condition?

A

Temperature indicators

26
Q

Clutches are used on what kind of helicopters?

A

Piston and non-free turbine

27
Q

When you hit the ‘start’ button on a turbine powered helicopter, what turns?

A

The compressor

28
Q

Automatic Clutches/Centrifugal clutches, where are they located?

A

Between Engine and transmission

29
Q

How do Centrifugal clutches work?

A

When the engine reaches a certain RPM

30
Q

How do manual clutches work?

A

They are engaged by the pilot

Uses Belt tension

31
Q

What are the two main types of freewheeling units?

A

Sprag Clutch type

Roller type

32
Q

Are freewheeling units found on all helicopters?

A

Do airplanes fly?

33
Q

On a freewheeling unit, which side freewheels?

A

Transmission side

34
Q

On a Roller type freewheeling unit, which side is Engine side?

A

Inner Part

35
Q

On the Roller type freewheeling unit, which side is the Transmission side?

A

Outer part

36
Q

The Hydraulic Engine Driven Pump on a helicopter is driven by what?

A

Transmission, in case engine fails you still have control

37
Q

What is the purpose of Flexible transmission mounts?

A

Reduces vibration

38
Q

What kind of transmission mount is used for the bell 206?

A

Isolation mount: Elasometric construction inside an aluminum box

The transmission is mounted to the fuselage using two pylon links/A-Frame links

Uses a Spike and stop plate

39
Q

What is Part A?

A

Deck Mounts

40
Q

What is part B?

A

Spherical Bearing

41
Q

What is Part C?

42
Q

What is Part D?

A

Isolation mount

43
Q

What is part E?

A

Pylons/A-Frame Links

44
Q

The Bell 206L uses this mount called..?

A

Nodal Beam Transmission Mounting

45
Q

Why is the Engine to MGB driveshaft flexible?

A

To account for the movement of the transmission during flight

46
Q

How is the tail rotor made flexible?

A

Using several flexible drive couplings (pack of stainless steel)

47
Q

How do is the tail rotor drive aligned?

A

Series of hanger bearings mounted on the tailboom

48
Q

During autorotation, what drives the tail rotor driveshaft?

A

The main rotor transmission

49
Q

What is the proper installation of beveled washers?

A

Beveled side should face the thomas coupling

50
Q

What are helicopter landing gear made of?

51
Q

How do Landing gear prevent Ground Resonance?

A

Flexible steel strip on the rear of the skid

Some landing gear could have Shock Absorbers placed between the landing gear to help eliminate Divergent oscillation

52
Q

What is the most common float configuration for helicopters?

A

Pontoon type

53
Q

What are the materials of rotor blades?

A

Wood and Metal

54
Q

What is the purpose of the stainless steel strip?

A

Acts as an abrasion shield to the blade

55
Q

How do you know if there’s a possible crack in the spar?

A

BIM indicator will light up Red

Rotary Wing (4 decks)

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