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EC130 B4/T2 > Systems > Flashcards

Systems Flashcards

1
Q

What type of rotor system?

A

Starflex semi-rigid 3 bladed

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2
Q

Describe the MGB Modules?

A

1: epicyclic reduction gear
2: bevel gear
3: lubrication gear

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3
Q

Which engines are used?

A

B4: Arriel 2B1
T2: Arriel 2D

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4
Q

How tall is the rotor system?

A

10.96’

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5
Q

How long is the aircraft?

A

41.47’

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6
Q

How wide is the aircraft?

A

7.57’

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7
Q

What are the three datum references?

A

X is longitudinal
Y is lateral
Z is horizontal

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8
Q

How do the skids try to prevent ground resonance?

A

Mustache shape and three point fitting with elastomer bearings

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9
Q

How many suspension bars support the MGB?

A

4

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10
Q

Why does the MGB need suspension?

A

Due to rigid attachment to rotor

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11
Q

How is the MGB secured to the airframe?

A

4 rigid bars at the top of airframe

4 suspension bars at MGB

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12
Q

How are the MGB vibrations absorbed?

A

Laminated pads which are flexible in shear and stiff in compression

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13
Q

What’s the purpose of flex couplings?

A

To absorb small misalignments

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14
Q

Where is the MGB low pres switch?

A

Left side of MGB Mod 2

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15
Q

Where is the MGB chip switch?

A
  1. Drain plug on MGB mod 1 next to sight glass

2. Top of MGB

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16
Q

Where is the MGB temp switch?

A

Next to chip detector / sight glass / mod 1

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17
Q

What is the max / rec / company rotor brake speeds?

A

170 / 140 / 100

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18
Q

How is each blade identified?

A

Colored adhesive tape

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19
Q

When does the main rotor system require servicing?

A

Never

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20
Q

What is a starflex?

A

A rotor hub which is star shaped (3 arms) and flexible in flapping direction.

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21
Q

What’s the “heart” of the starflex?

A

Spherical Thrust Bearings

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22
Q

Describe a Spherical Thrust Bearing?

A

A bearing flexible in torsion, flapping and drag but rigid in compression.

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23
Q

What’s the purpose of a frequency adaptor?

A

In-plane dragwise dampening and rigidity. Dampening to limit oscillations and stiffness to adjust the natural frequency.

24
Q

What absorbs the in-plane dragwise movements?

A

Frequency Adaptor

25
Q

Can you misassemble a starflex hub?

A

No, every part is either identical or foolproofed.

26
Q

Which trim tabs can be adjusted on the MR Blades?

A

Inner 2 tabs

27
Q

How is the MR RPM acquired?

A

A magnetic rate sensor (phonetic sensor) placed in front of a slotted wheel (ring gear)

28
Q

Which PCB processes the aural warning for RRPM?

A

PCB 1 in ASU

29
Q

What’s the ASU?

A

Then ancillary system unit ensures helicopters electrical ancillary functions.

30
Q

What functions are provided by the ASU?

A

Visual and Aural warnings, Nr signal for VEMD and EBCAU functions

31
Q

What’s an EBCAU?

A

Engine Backup Control Ancillary Unit.

Provides back up engine management

32
Q

What reduces cabin vibrations?

A

Cabin resonators

33
Q

What’s a cabin resonator?

A

A series of weights attached to the cabin to counteract main rotor vibrations

34
Q

How does the rotor hub vibration absorber work?

A

It uses a weight on a set of springs to counteract loads exerted on the rotor hub.

35
Q

How many shafts make up the tail rotor drive shaft?

A
  1. Short, intermediate and rear shaft
36
Q

What’s the tail rotor short shaft made out of and why?

A

Steel, due to exhaust heat.

37
Q

How many couplings support the tail rotor shaft?

A

4 flex couplings

38
Q

How is the tail rotor lubricated?

A

Splash lubrication

39
Q

Which way should the tail rotor “mickey mouse ears” face?

A

Backwards / Aft

40
Q

How are pedal inputs transferred to the tail rotor?

A

Flex ball cable

41
Q

What degrees are the fenestron blades mounted?

A

45° / 32.5° / 25 °

42
Q

What’s the TR RPM

A

3568 RPMs

43
Q

What’s the purpose of the boss weights?

A

To generate a moment counteracting the blade zero pitch return moment so that the air foil is stabilized at a set pitch

44
Q

What’s unique about the swashplate?

A

Uniball / Teflon design

45
Q

Where is the starter/generator mounted?

A

Right side of engine on the bottom

46
Q

When does the starter become a generator?

A

When it produces more than 0.5V difference to the busbar.

47
Q

What type of servos are used?

A

Double rotary distributor design

48
Q

Where are the servos anchored?

A

To the bell housing of the MGB

49
Q

What’s the purpose of a double rotary distributor valve?

A

Prevents flight controls from being jammed if a valve seizes.

50
Q

How does the double distributor valve work?

A

It leverages a locking spring, which when freed actuates a microswitch for notification of a failure and bypasses the main valve for continued operation.

51
Q

Where is the limit sensor

A

Toward the top on the right side of the rotor system.

52
Q

Why is the limit sensor on the right side?

A

It’s the point with the most flapping and this best indicator of load.

53
Q

How much pressure is in the hydraulic system?

A

35 bar

54
Q

How is the upper hydraulic system powered?

A

MGB

55
Q

How is the lower hydraulic system powered?

A

V belt

56
Q

When does the limit light come on?

A

Exceeding loading limits on rotor
Indicated failure of upper hydraulics
Cyclic outside 10-88° quadrant

57
Q

When does the fuel filter light come on?

A

Fuel pressure at or below 0.7 bar

EC130 B4/T2 (3 decks)

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