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Heli Second year bullshit > Mid Term but its the final instead > Flashcards

Mid Term but its the final instead Flashcards

1
Q

what are the components of a main rotor blade

A 
leading edge
trailing edge
span
chord
tip
root
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2
Q

what are the types of rotor blades

A

wooden
metal
composite

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3
Q

what is the difference between BIS and BIM

A

Blade inspection method - sikorsky

Blade inspection system - bell

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4
Q

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

A

radial and axial

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5
Q

what are the different fit tolerances for bearings

A

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

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6
Q

what are the different types of oil seals

A

Lip seal
Carbon Magnetic
Labyrinth
Hydrodynamic

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7
Q

will a labyrinth seal work statically or dynamically

A

only works dynamically (with oil or liquid present

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8
Q

which seals will work statically

A

all seals except labyrinth seals work both statically and dynamically

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9
Q

what is a major drawback of a lip seal

A

can cut a groove in the shaft over time

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10
Q

what is brinelling? how can you identify false brinelling

A

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

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11
Q

what are the functions of a gearbox

A

transmit power
change direction
increase / decrease speed

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12
Q

what are the types of gearbox

A

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

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13
Q

what is the accessory drive used for

A

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

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14
Q

what are the different types of gears within a gearbox

A 
straight tooth
helical
bevel
spiral bevel
worm
planetary
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15
Q

what is the difference between a bevel and spiral bevel gear

A

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

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16
Q

what are the components of a planetary gear assembly

A

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

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17
Q

what is the formula to calculate planetary gear ratio

A

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

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18
Q

what is the difference between lash and pattern

A

lash is how well the teeth mesh with each other.

pattern is where the gears contact while moving

19
Q

what control must be rigged first on a bell 206

A

collective

20
Q

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

A

1 inch

21
Q

the droop compensator is connected to what

A

collective stick

22
Q

what precaution must be taken when raising the main rotor hub

A

do not let split cones fall

23
Q

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

A

trailing

24
Q

what is the purpose of a helicopters hydraulic system

A

control boost

eliminate rotor system feedback

25
Q

what conditions must be met when rigging flight controls

A

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

26
Q

two types of engine controls

A

Proactive - anticipate power changes and adjust. droop compensator / anticipator

Reactive - sensing workload and adjusting to maintain RPM. governor

all helicopters have oth

27
Q

main rotor grips must be secured from what

A

rotating beyond 90 degrees

28
Q

what are the different kinds of bearings

A

ball
roller
spherical
elastomeric

29
Q

what are the configurations of ball bearing

A

single row deep groove

single row angular

four point contact

duplex angular contact

30
Q

what are the different configurations of roller bearing

A

single row cylindrical

needle roller

single row tapered

31
Q

what does life lubricated mean

A

bearing is coated in teflon or other low friction surface

32
Q

when rigging flight controls, what must be rigged first

A

collective

33
Q

where is the droop compensator

A

connected to the collective stick

34
Q

swashplate friction is between bearing set and what

A

pivot sleeve

35
Q

when installing a beveled washer, where does the bevel go

A

against the bolt head

36
Q

what are the three vibration ranges

A

Low - less than 500Hz - Main rotor

Medium - 500 - 2000Hz - main rotor or airframe

High - above 2000Hz - tail rotor, driveshafts, engine

37
Q

types of vibrations

A

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

38
Q

track adjustments

A

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)

39
Q

methods of stability control

A

stabilizer bars and dampers. bars control blades, swashplate controls bars.

stabilizer bars are gyroscopic to dampen sudden changes

40
Q

what is HUMS

A

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

41
Q

transmitted damage

A

damage as a result of something happening to a different part of the aircraft.

ex - main rotor strike, T/R drive shaft found bent

42
Q

when setting autorotation rpm, what adjustment would cause faster rpm

A

shortening pitch links

43
Q

what is the purpose of hydraulic accumulators

A

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

44
Q

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

A

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

Heli Second year bullshit (2 decks)

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