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Willys Flashing > 11.6 > Flashcards

11.6 Flashcards

1
Q

What is the voltage available on aircraft?

A

28 VDC
115 Vac / 200 400hz
24 vac on battery

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2
Q

How is electricity generated on aircraft?

A

IDG integrated drive generator

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3
Q

How is DC current generated?

A

Through the (TRU) transfer rectifier unit

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4
Q

What are the different types of power generation available?

A

APU auxiliary power unit RAT ram air turbine GPU ground power unit

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5
Q

How long must a battery be able to supply sufficient power?

A

30 mins

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6
Q

How is DC to AC power conversion done on aircraft?

A

Through a static inverter

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7
Q

What is the meaning of battery rating and figures?

A

12 (v) volts 60 (atm) amp hours

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8
Q

What are the two types of electronic power generation?

A

Dc and Ac

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9
Q

What is the main aircraft battery type?

A

Nickel cadmium 24vdc

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10
Q

What is the battery capable of providing?

A

-starting the engines
-supply to essential consumers
-general stabilises dc bus bars

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11
Q

What is the design of battery venting?

A

Rubber or other non corrosive pipes vent to fuselage skin, lead acid type have an acid trap

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12
Q

What is common practice when securing quick release connectors for batteries?

A

Using copper lock wires

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13
Q

How much voltage does a single cell produce and how are they connected?

A

1.2 volts connected in series for a complete voltage of 24 volts

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14
Q

During charge and discharge what will be the voltage?

A

During charge 1.5 v
During discharge 1.0 v

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15
Q

When / how often would a workshop condition check be performed?

A

Every 2000 flying hours

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16
Q

What precautions should be taken to ensure reliable battery operation?

A

-never attempt repeat apu starts the battery may overheat
-do not discharge battery below 22v
-line maintenance personnel must check charge level at standard intervals

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17
Q

What is thermal runaway?

A

Effectively a series of knock on effects lead to an explosion

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18
Q

What are the two types of battery charging?

A

-constant voltage
-constant current

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19
Q

What capacity must testing achieve on a battery?

A

80%

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20
Q

What are the advantages of a lithium ion battery?

A

-high voltage and high current production
-improved power quality
-ability to recharge quickly
-30% less weight than nic-cd
-no memory degradation

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21
Q

What is a dc generator required to provide?

A
  • a constant voltage with set limits
  • a full range of engine speeds idle to take off
  • no loads up to full load
  • to share the load with other generators or multi engine aircraft
22
Q

What is a paralleled system?

A

When the load is shared between IDG’s and the equalising coils detect output to ensure equal output from IDG

23
Q

What is load shedding?

A

Off loading high energy consumption systems

24
Q

What are the sources of AC power?

A

Ac generator
Static inverters
Rotary inverters

25
Q

What is AC electrical power supply on aircraft?

A

Three - phase 400 hz 115/200v

26
Q

What is a rotating field generator?

A

A stationary armature with a rotating field with no change in flux direction, the magnetic field is either permanent magnetic or dc wound coil

27
Q

What is the AC generator frequency directly proportional to?

A

The rotational speed of the rotor

28
Q

Why are modern aircraft powered by constant frequency systems?

A

-lighter
-can be operated in parallel
-suitable for wider range of loads
-generator loading does not vary with engine speed
-loads are designed for optimum efficiency
-induction motors operate at a constant speed

29
Q

What is a constant speed drive?

A

It takes the variable speed of the engine and creates a constant speed

30
Q

What do modern civil aircraft typically use in terms of generators?

A

Three phase brushless generators

31
Q

Where is the constant speed drive installed?

A

Between Auxiliary gearbox and the generator

32
Q

What is the function and design of the oil circuit on a CSD?

A

An internal oil circuit used as hydraulic fluid for the motor pump, cooling and lubrication

33
Q

What is underspeed?

A

When CSD input speed drops below normal control range, the CSD cannot maintain the output
This occurs at 5% below engine idle

34
Q

What is underspeed?

A

When CSD input speed drops below normal control range, the CSD cannot maintain the output
This occurs at 5% below engine idle

35
Q

What is the purpose of CSD disconnect?

A

Decouples input shaft from input spline shaft in transmission malfunction

36
Q

What is the purpose of CSD disconnect?

A

Decouples input shaft from input spline shaft in transmission malfunction

37
Q

What is disconnect verification?

A

ECAM/EICAS check for zero voltage if done

38
Q

What is disconnect verification?

A

ECAM/EICAS check for zero voltage if done

39
Q

What is an IDG?

A

Integrated drive generator
A state of the art generator
Generator and CSDU in one

40
Q

What are the functions of generator control units?

A

-Voltage regulation
-current limiting
-protection from out of tolerance voltages
-frequencies crew alerting

41
Q

What is a current transformer?

A

Amp clamp
Three inductive pick up coils that provide current sensing signals

42
Q

How many revolutions are needed on a 1 or 2 pole pick up for the same frequency?

A

With 2 pole pairs it will only need to spin half as often

43
Q

What are the circuit protection devices?

A

Fuses and circuit breakers

44
Q

What does a circuit breaker or fuse do?

A

Prevent currents higher than the max AWG

45
Q

Where is the only circuit that a fuse or circuit breaker is not needed?

A

Generator feeder lines

46
Q

What is more commonly used over fuses?

A

Circuit breakers

47
Q

What are the types or circuit breakers?

A

Push/ pull
Pulse
Switch
Thermal

48
Q

How many times can a circuit breaker be reset during flight ?

A

Once if necessary

49
Q

What is common when tripping circuit breakers?

A

Gagging and an entry into the tech log

50
Q

What are the 6 pins on ground power plugs?

A

Phases A,B,C, neutral, 2 interlock the e & f which are shorter

Willys Flashing (24 decks)

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