Last Few Weeks

Question 1

What are the two ways that bearings can be categorized?

Answer 1

Shape or Function

Question 2

What is the purpose of a bearing?

Answer 2

Allows for movement under load

Question 3

What are the types of bearings?

Answer 3

Ball Bearing Roller Bearing Tapered Roller Spherical Bearing

Question 4

Ball Bearings take what kind of load?

Answer 4

Radial+Axial (Thrust) loads

Question 5

Roller Bearings take what kind of load?

Answer 5

Radial only

Question 6

Tapered Roller Bearings take what kind of load?

Answer 6

Radial + Thrust Loads

Question 7

_________ bearings are used for control linkages

Answer 7

Spherical

Question 8

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

Answer 8

Roller Staking

Question 9

________ : 2 bearings back to back

Answer 9

Duplex

Question 10

What should you never do to clean bearings?

Answer 10

Spin using shop air

Question 11

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

Answer 11

Gears

Question 12

What are the different types of gears?

Answer 12

Straight tooth, helical, spiral bevel gears

Question 13

______ Gears change direction by 90 degrees

Answer 13

Bevel

Question 14

______ ____________ ____________ delivers engine torque to the MR driveshaft

Answer 14

Main Gearbox Transmission

Question 15

What are the other purposes of the main gearbox transmission?

Answer 15

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

Question 16

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

Answer 16

Two

Question 17

Planetary Gears provide _______ gear reduction

Answer 17

Inline

Question 18

What are the green gears called?

Answer 18

Planets

Question 19

What is the gear coloured yellow called?

Answer 19

Sun Gear

Question 20

What is the Purple gear called?

Answer 20

Ring Gear

Question 21

Piston power helicopter transmissions need a _______

Answer 21

Clutch

Question 22

The purpose of a clutch is to start the ________ first

Answer 22

Engine

Question 23

What do the Engine to Main Gear Box driveshafts do?

Answer 23

Transfers torque from engine to MGB

Corrects for misalignment and movement of the transmission

Question 24

Shaft arrangements require what type of lubrication?

Answer 24

Hand packed 204 grease

Question 25

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

Answer 25

Temperature indicators

Question 26

Clutches are used on what kind of helicopters?

Answer 26

Piston and non-free turbine

Question 27

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

Answer 27

The compressor

Question 28

Automatic Clutches/Centrifugal clutches, where are they located?

Answer 28

Between Engine and transmission

Question 29

How do Centrifugal clutches work?

Answer 29

When the engine reaches a certain RPM

Question 30

How do manual clutches work?

Answer 30

They are engaged by the pilot Uses Belt tension

Question 31

What are the two main types of freewheeling units?

Answer 31

Sprag Clutch type Roller type

Question 32

Are freewheeling units found on all helicopters?

Answer 32

Do airplanes fly?

Question 33

On a freewheeling unit, which side freewheels?

Answer 33

Transmission side

Question 34

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

Answer 34

Inner Part

Question 35

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

Answer 35

Outer part

Question 36

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

Answer 36

Transmission, in case engine fails you still have control

Question 37

What is the purpose of Flexible transmission mounts?

Answer 37

Reduces vibration

Question 38

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

Answer 38

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

Question 39

What is Part A?

Answer 39

Deck Mounts

Question 40

What is part B?

Answer 40

Spherical Bearing

Question 41

What is Part C?

Answer 41

Spindle

Question 42

What is Part D?

Answer 42

Isolation mount

Question 43

What is part E?

Answer 43

Pylons/A-Frame Links

Question 44

The Bell 206L uses this mount called..?

Answer 44

Nodal Beam Transmission Mounting

Question 45

Why is the Engine to MGB driveshaft flexible?

Answer 45

To account for the movement of the transmission during flight

Question 46

How is the tail rotor made flexible?

Answer 46

Using several flexible drive couplings (pack of stainless steel)

Question 47

How do is the tail rotor drive aligned?

Answer 47

Series of hanger bearings mounted on the tailboom

Question 48

During autorotation, what drives the tail rotor driveshaft?

Answer 48

The main rotor transmission

Question 49

What is the proper installation of beveled washers?

Answer 49

Beveled side should face the thomas coupling

Question 50

What are helicopter landing gear made of?

Answer 50

Steel

Question 51

How do Landing gear prevent Ground Resonance?

Answer 51

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

Question 52

What is the most common float configuration for helicopters?

Answer 52

Pontoon type

Question 53

What are the materials of rotor blades?

Answer 53

Wood and Metal

Question 54

What is the purpose of the stainless steel strip?

Answer 54

Acts as an abrasion shield to the blade

Question 55

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

Answer 55

BIM indicator will light up Red