Mid Term but its the final instead

Question 1

what are the components of a main rotor blade

Answer 1

leading edge
trailing edge
span
chord
tip
root

Question 2

what are the types of rotor blades

Answer 2

wooden
metal
composite

Question 3

what is the difference between BIS and BIM

Answer 3

Blade inspection method - sikorsky

Blade inspection system - bell

Question 4

what are the different loads that can be applied to a bearling

Answer 4

radial and axial

Question 5

what are the different fit tolerances for bearings

Answer 5

loose fit - > 1”
Press fit - = 1.0”
Interference fit - < 1”

Question 6

what are the different types of oil seals

Answer 6

Lip seal
Carbon Magnetic
Labyrinth
Hydrodynamic

Question 7

will a labyrinth seal work statically or dynamically

Answer 7

only works dynamically (with oil or liquid present

Question 8

which seals will work statically

Answer 8

all seals except labyrinth seals work both statically and dynamically

Question 9

what is a major drawback of a lip seal

Answer 9

can cut a groove in the shaft over time

Question 10

what is brinelling? how can you identify false brinelling

Answer 10

brinelling is when a bearing begins to form dents caused by excessive load. false brinelling is caused by vibration, usually in transport.

Question 11

what are the functions of a gearbox

Answer 11

transmit power
change direction
increase / decrease speed

Question 12

what are the types of gearbox

Answer 12

main rotor gearbox - speed decreasing
tail rotor gearbox - usually speed decreasing
intermediate gearbox - no change in speed, only direction
combination gearbox - multi engine helicopters

Question 13

what is the accessory drive used for

Answer 13

running components from the main system such as:
tach gen
hydraulic pump
oil pump

Question 14

what are the different types of gears within a gearbox

Answer 14

straight tooth
helical
bevel
spiral bevel
worm
planetary

Question 15

what is the difference between a bevel and spiral bevel gear

Answer 15

bevel gear tapers in and has straight teeth. a spiral bevel gear tapers in but the teeth are slanted

Question 16

what are the components of a planetary gear assembly

Answer 16

sun gear - input
ring gear
planets
spider - output to planets

Question 17

what is the formula to calculate planetary gear ratio

Answer 17

of sun teeth + #of ring teeth / #of sun teeth

Question 18

what is the difference between lash and pattern

Answer 18

lash is how well the teeth mesh with each other.

pattern is where the gears contact while moving

Question 19

what control must be rigged first on a bell 206

Answer 19

collective

Question 20

what is the max amount of exposed thread allowable on control rods

Answer 20

1 inch

Question 21

the droop compensator is connected to what

Answer 21

collective stick

Question 22

what precaution must be taken when raising the main rotor hub

Answer 22

do not let split cones fall

Question 23

prior to removing main rotor blades, the nut on the ___ edge must be loosened

Answer 23

trailing

Question 24

what is the purpose of a helicopters hydraulic system

Answer 24

control boost

eliminate rotor system feedback

Question 25

what conditions must be met when rigging flight controls

Answer 25

controls must: move in the correct direction move the correct distance cannot touch anything they arent supposed to

Question 26

two types of engine controls

Answer 26

Proactive - anticipate power changes and adjust. droop compensator / anticipator Reactive - sensing workload and adjusting to maintain RPM. governor all helicopters have oth

Question 27

main rotor grips must be secured from what

Answer 27

rotating beyond 90 degrees

Question 28

what are the different kinds of bearings

Answer 28

ball roller spherical elastomeric

Question 29

what are the configurations of ball bearing

Answer 29

single row deep groove single row angular four point contact duplex angular contact

Question 30

what are the different configurations of roller bearing

Answer 30

single row cylindrical needle roller single row tapered

Question 31

what does life lubricated mean

Answer 31

bearing is coated in teflon or other low friction surface

Question 32

when rigging flight controls, what must be rigged first

Answer 32

collective

Question 33

where is the droop compensator

Answer 33

connected to the collective stick

Question 34

swashplate friction is between bearing set and what

Answer 34

pivot sleeve

Question 35

when installing a beveled washer, where does the bevel go

Answer 35

against the bolt head

Question 36

what are the three vibration ranges

Answer 36

Low - less than 500Hz - Main rotor Medium - 500 - 2000Hz - main rotor or airframe High - above 2000Hz - tail rotor, driveshafts, engine

Question 37

types of vibrations

Answer 37

Lateral - out of balance condition. center of mass out of line from center of rotation. adjusted by balancing blades statically or dynamically Vertical - out of track condition. blades are not producing equal amounts of lift. adjusted by changing pitch links or blade tabs

Question 38

track adjustments

Answer 38

speed sensitive - vibration changes with forward airspeed. tab adjustment. up will cause blade to fly higher but cause more aerodynamic drag non speed sensitive - consistent vibration. pitch link adjustment (shorter if possible)

Question 39

methods of stability control

Answer 39

stabilizer bars and dampers. bars control blades, swashplate controls bars. stabilizer bars are gyroscopic to dampen sudden changes

Question 40

what is HUMS

Answer 40

health and usage monitoring system. cameras installed to monitor blade track and vibrations and provide trend monitoring data

Question 41

transmitted damage

Answer 41

damage as a result of something happening to a different part of the aircraft. ex - main rotor strike, T/R drive shaft found bent

Question 42

when setting autorotation rpm, what adjustment would cause faster rpm

Answer 42

shortening pitch links

Question 43

what is the purpose of hydraulic accumulators

Answer 43

provide limited number of control movements in the event of hydraulic failure

Question 44

what is the purpose of the throttle? where does it fit in the engine control system

Answer 44

primarily used for start up / shut down. connected to the fuel control unit