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ACFT tech Systems > ACFT SYS TUESDAY > Flashcards

ACFT SYS TUESDAY Flashcards

1
Q

The collective pedals change the main rotor blades ___ and at the dame _____

A

collectively
time

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2
Q

what does the control rode with the white band correlate too?

A

Collective

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3
Q

what does the control rode with the red band correlate too?

A

Roll - cyclic

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4
Q

what does the control rode with the black band correlate too?

A

pitch - cyclic

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5
Q

Function of the swashplate assembly

A

convert stationary control inputs into rotating outputs

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6
Q

the collective form will lift up which swahsplates during when collective is raised

A

Stationary (control ring) and rotating (bearing ring)

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7
Q

what components transmit the control inputs from the rotating swashplate to the main rotor blades

A

4 rotating control rods

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8
Q

the middle mixing unit is the ____ fork

A

collective

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9
Q

Main Rotor system consist of?

A

bearing-less, hing-less 4 blade main rotor

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10
Q

What function does the mast moment indicator provide

A

rotor mast bending

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11
Q

by bending and flexing the main rotor blades Flex beam, allows each blade to

A

flap, feather, lead, lag

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12
Q

what features enables the discharge of static electricity from the helicopter

A

static discharger riveted to the trailing edge in the blade tip area
electrical conductive strap

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13
Q

what sorty of rotor system does the HATS EC135 have

A

hing-less, bearing-less, 4 blade rotor head

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14
Q

the ____ cable transmits the control movements from the pilots bell-crank to the duel yaw actuators in the fenestron structure

A

flexball

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15
Q

tail rotor control unit performs the function of a ___ for tail rotor

A

swashplate

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16
Q

the shrouded fan-in-fin desighn includes ____ small blades spinning at high speed

A

10

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17
Q

how does the shrouded configuration improve efficiency

A

decreases drag

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18
Q

the trim system provides artificial control feel to the cyclic system through the use of

A

Force gradient springs

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19
Q

what is the direction of the main rotor and what is the reaction

A

counterclockwise rotation, clockwise torque reaction

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20
Q

what flight control actuator will no longer be boosted with the loss of #2 HYD system

A

tail rotor

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21
Q

both hydraulic pumps are driven by ____

A

Transmission accessory drive gearbox

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22
Q

minimum HYD reservoir display

A

50%

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23
Q

With the HYD test switch selected to SYS 2 what cockpit and flight control indicators would you expect to see or feel?

A

SYS 1 Caution
Nil changes to flight control feel

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24
Q

HYD test switch is only to be used?

A

On the ground

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25
Q

what ACFT control system can provide an input into an EHA

A

auto pilot and SAS

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26
Q

where no control input is present in a follow up HYD system, which component blocks the pump pressure from reaching the boost cylinder

A

The control spool

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27
Q

the pitch, collective and roll hydraulic actuators are ____ stage actuators

A

dual

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28
Q

which hydraulic system supplies the electro-hydraulic component of the EHA’s

A

HYD system 1

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29
Q

what type of hydraulic actuator does the collective have and what is its location within the main rotor hydraulic pack

A

MHA, in the middle

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30
Q

How many boost pistons are there in a single EC135 MHA/EHA

A

1

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31
Q

Loss of the #1 HYD system will result in a degradation of the ___ and ____ stability Augmentation channels

A

Pitch and Roll

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32
Q

Why do HYD systems work

A

liquids do not expand

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33
Q

what does the engine provide for the aircraft

A

TQ, bleed air, electrical power

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34
Q

Is the gas generator shaft connected to the power turbine shaft?

A

No

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35
Q

basic principle of the Turbomecca ARRIUS Engine

A

suck squeeze bang blow

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36
Q

what does N1 figure on the VEMD indicate

A

gas generator rpm as a %

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37
Q

What N is the power turbine referred to?

A

N2

38
Q

which shafts drive the reduction and accessory geartrains respectively

A

N1 for accessory geartrain (gas turbine)
n2 for reduction gear train (power turbine)

39
Q

where is N2 displayed in the cockpit

A

VEMD

40
Q

what does the N2 needle on the triple tacho indicate

A

the power turbine rpm as a %

41
Q

what is the purpose of the reduction geartrain

A

reduces the power turbine speed to an appropriate speed for the main transmission

42
Q

what is the purpose of the accessory drivetrain

A

to provide the appropriate speed reduction for the engine accessories

43
Q

what items does the engine accessory drivetrain drive?

A

alternator, starter/generator, oil pump and fuel pump

44
Q

when acting as a starter the starter/generator will turn which “N”

A

N1

45
Q

what is the purpose of the oil system

A

temp reg and lube

46
Q

what does “ENG CHIP” mean on the left side of the CAD?

A

ENG 1 has metal particles caught by one of the 2 magnetic plugs

47
Q

how many times can we use the ENG CHIP switch

A

once per indication

48
Q

what are the oil cooling fans driven by?

A

the main transmission

49
Q

This pump draws oil from the tank and delivers it to the engine areas that require lubrication and cooling

A

pressure pump

50
Q

how many pressure v scavenger pumps?

A

1 pressure, 2 scavenger

51
Q

what is the purpose of the IBF

A

protect compressor blades by removing foreign objects such as sand from the engine inlet system

52
Q

where do we get info for the ibf in cockpit

A

clogging info on rear centre console

53
Q

are the electric bypass doors normally open or closed?

A

closed

54
Q

what happens to the IBF bypass doors if an engine failure occurs?

A

the failed engine will stay closed and the running engine will open

55
Q

what is the purpose of the Fuel pump unit?

A

supplies fuel under the conditions set by FADEC

56
Q

what are the engine fuel pumps driven by

A

driven by N1 geartrain and are located on the front face of the reduction gearbox

56
Q

FUEL FILT on right side meaning

A

impending opening of the #2 engine by-pass door due to clogged filter element

56
Q

how many and what type of fuel injectors?

A

12:
1 preferred
2 starter
9 main

57
Q

when do the main injectors take over?

A

when N1 is 50%

58
Q

what is different about the preference injector

A

in low fuel enviro it is the only injector that will continue supply

59
Q

what are the 3 different fuel metering modes

A

auto - EECU only
manual - twist grip
mixed - EECU and twist grip

60
Q

which twist grip controls which engine?

A

Top/lines = left
bottom/ bumpy = right

61
Q

collective button to stop fuel

A

OFF or STOP MIN FUEL

62
Q

what controls the engine start sequence

A

the EECU

63
Q

at what N1 does the ignition system shut of during start up?

A

50%

64
Q

how much voltage and where does it come from for the ENG start sequence

A

24VDC, EPU or other engine generator

65
Q
A
66
Q

Besides FADEC malfunction, what 2 methods can take the engines out of auto mode

A

Twist grip moves from neutral or engine mode select switch set to MAN

67
Q

If we had double generator failure, would FADECS stop working

A

No, the alternator from the accessory gear train provides power to the FADEC regardless of generator output

68
Q

If the engines were running, what would happen if you turned the engine control panel FADEC switch off

A

FADECS remain on. at grater then 50% N1 the FADECS are powered by the Alternatir which is driven directly from the accessory gear train. The engine control panel switch only provides power to theFADEX for engine start when the accessory drive isn’t driving the alternator.

69
Q

What does VENT/OFF switch do

A

The starter/generator will run up the gas generator assembly approx 20% N1, but the engine ignition system is deactivated and the fuel remains shut off

70
Q

What happens to the fuel flow of an engine if it is entered into manual mode

A

It freezes at the current point

71
Q

Components of FADEC

A

EECU and twist grip

72
Q

What is the FADECS primary task?

A

Controls the corresponding turbo-shaft engine and provides the interface to the other FADEC as well as to the aircraft for data interchange

73
Q

What are the FADEC primary functions

A

Fuel supply, auto engine control, auto torque matching, engine and power monitoring, power turbine over speed protection, governs Nr according to DA

74
Q

What is the crosstalk capability and what does it provide for us

A

Allows engines for cross reference each other and detects manual mode, OEI, training activation…

75
Q

At what point during the engine start does the ignition system deactivate and the engine becomes self sustaining?

A

50% N1

76
Q

When do we turn engine fuel prime pumps off

A

IAW checklist
When the engines are IDLE/ Self sustaining before advancing to flight

77
Q

What is meant by the term power sharing

A

When the system governs and optimises the performance of the engines and adjust relative to each other. The N2 datum is set N2 set to 100.5% under normal flight conditions

78
Q

At what DA does N2 automatically increase

A

DA from 4500-9500ft the N2 speed is automatically increased from 100.5% to approx 103.5%

79
Q

If you beep the ENG TRIM switch on the collective to the left, what occurs

A

The TQ on the LH (ENG 1) accelerates and the RH (Eng 2) decelerates

80
Q

Which collective twist grip controls the RH engine

A

The bottom twist grip

81
Q

What 2 things are required to return the engine fuel system back into the normal auto mode

A

NORM overhead panel, neutral twist grip

82
Q

How can you manually shut off the fuel to an engine using twist grips

A

Pressing OFF or STOP MIN FUEL and fully winding twist grip

83
Q

What is droop compensation and how does it work

A

To prevent a decrease of Nr the FADEC anticipates the situation using signals from the LVDTs

84
Q

If HI Nr is selected, what airspeed does it active/deactivate

A

Activate 50k
Deactivate 55k

85
Q

Where does the HI Nr revive its airspeed data from? What occurs if it’s blocked

A

ADC
Hi Nr turns on

86
Q

How could the pilot change the 30s to 2m power rating when OEI

A

Via the topping switch on collective

87
Q

What happens to torque as Nr slows from 95%and 90% Nr is OEI

A

For every 1% increase in TQ Nr will decrease 1%

88
Q

What does the CVFDR and HUMsdo in the aircraft

A

Record ACFT flight data which enables accurate flight data record collection

ACFT tech Systems (4 decks)

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