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AW169 Type Rating (Leonardo) > Electrical Power (24) > Flashcards

Electrical Power (24) Flashcards

1
Q

What does EPGDS stand for and what does it do?

A

Electrical Power Generation and Distribution System
- Generates and distribute DC Power
- Store electrical energy
- External power distribution

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2
Q

How many systems are in the EPGDS?

A

2

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3
Q

What provides electrical power?

A

By two Brushless Starter Generators (BSGs) and their relative Brushless Control Units (BCUs).

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4
Q

How many batteries are part of the EPGDS?

A

2
- Main
- Auxillary

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5
Q

How many busses are there in the EPGDS?

A

8
- MAIN 1 & 2
- ESS 1 & 2
- NON-ESS 1 & 2
- EMER 1 & 2

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6
Q

Are EPGSD 1 and 2 connected in normal flight?

A

NO
The bus tie is open

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7
Q

How are the busses controlled?

A

By the two AMMCs (except the EMER busses)

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8
Q

What makes up EPGDS 1?

A
  • BSG 1
  • BCU 1
  • MAIN 1
  • MAIN 3
  • NON-ESS 1
  • NON-ESS 3
  • EMER 1
  • ESS 1
  • MAIN BATT
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9
Q

What makes up EPGDS 2?

A
  • BSG 2
  • BCU 2
  • MAIN 2
  • MAIN 4
  • NON-ESS 2
  • NON-ESS 4
  • EMER 2
  • ESS 2
  • AUX BATT
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10
Q

Where are the BSGs installed?

A

On the engine reduction gearbox

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11
Q

How are the BSGs cooled?

A

Air cooled

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12
Q

Where are the BCUs installed?

A

Rear avionics bay

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13
Q

How are the BSGs controlled?

A

By the BCUs
Electrical inputs tell is to work as either a starter or generator

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14
Q

What protections do the BCUs provide during start?

A
  • Locked rotor or wrong direction
  • Overcurrent
  • Over-temp
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15
Q

During generating mode what protections are implemented by the BCUs?

A
  • Starter to generator switchover interlock
  • Over and under voltage protection
  • Over current protection (include short circuit)
  • Under and Over frequency protection
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16
Q

Describe the Main battery

A

24Vdc, 33Ah NiCd

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17
Q

At what temperature will an over-temperature alam generate in either battery?

A

71°C

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18
Q

Describe the Auxiliary battery

A

24Vdc, 13Ah Ni-Cd

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19
Q

What does the Auxillary battery do?

A
  1. Powers the EMER & ESS loads during:
    - Engine starting
    - During double gen failure
    - On the ground (engines not running and no EXT pwr)
  2. Provides Overtemp warning
  3. Can be recharged by EXT pwr
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20
Q

What rating is the EXT pwr?

A

28 Vdc

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21
Q

What does EXT Pwr provide?

A
  1. Power to ALL busses
  2. Powers the starter during engine starting
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22
Q

What does PDU stand for and what do they do?

A

Power Distribution Unit
- Connects electrical power sources (BSGs/BATTs) to the left and right Busses.
- Checks and connects EXT pwr to the distribution Busses.
- Controls the BUS TIE contactor.

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23
Q

What does CBP stand for and which Busbars are on it?

A

Circuit Breaker Panel
- Only EMER 1 and EMER 2

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24
Q

What does REPU stand for?

A

Remote Electrical Power Unit
(Virtual Circuit breakers and bus bars)

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25
Q

What do the REPUs do?

A

Physically control the power distribution to the helicopter equipments.
- SOLID STATE CIRCUIT BREAKERS

26
Q

How many REPUs are fitted to the aircraft?

A

3
- 2x in nose avionics bay
- 1x in the rear avionics bay

27
Q

How are the solid state circuit breakers controlled?

A

Via the ECDU

28
Q

What does the MCOS switch do?

A

Master Cut-OFF switch
- isolates the electrics in an emergency

29
Q

Can you override the BUS TIE and NON ESS busbars

A

YES
Via the EDCU Electrical Control Page

30
Q

How are the solid state circuit breakers controlled by the pilot?

A

Via the EDCU

31
Q

What are the EPGDS Interfaces?

A

Engine starting
WOW
Integration & Displays
SSEPMS

32
Q

What does PSGS stand for?

A

Power Start Generation Subsystem
2 BSGs
2 BCUs

33
Q

What does PDCS stand for?

A

Power Distribution and Control Subsystem
2x PDUs
1x CBP
1x Control Panel
1x 28Vdc power recepticle

34
Q

What does CBP mean?

A

Circuit Breaker Panel
(We have 2; EMERG BUS 1 & 2)

35
Q

What is on REPU 1?

A

MAIN 1
NON ESS 1
ESS 1

36
Q

What is on REPU 2?

A

MAIN BUS 2
Non ESSS 2
ESS 2

37
Q

What is on REPU 3?

A

MAIN BUS 3
Non Ess 3
MAIN BUS 4
Non Ess 4

38
Q

Where is the External Power receptacle located?

A

On the aft of the right sponson

39
Q

What is the BCUs role in starting?

A

24Vdc is inverted to the required six-phase 24Vac to turn the BSG

40
Q

What is the BCUs role during power generation?

A

BSG Outputs 24Vac to the BCU which converts to 28Vdc at 300A to the PDU

41
Q

Where is the main battery located?

A

Rear avionics bay

42
Q

Does the Aux Batt assist with the start?

A

No

43
Q

Where are the PDUs located?

A

Rear avionics bay

44
Q

What does SSEPMS Stand for?

A

Solid State Electrical Power Management System
(Contains REPUs)

45
Q

What is in PDU1?

A

Gen BUS 1 (BCU1)
Batt Bus 1 (Main Batt)

46
Q

What is in PDU2?

A

Gen Bus 2 (BCU2 & Ext Pwr)
Batt Bus 2 (Aux)

47
Q

What does the Master Cut-off Switch do?

A

Isolates electric in an emergency
(except if aircraft is powered by EXT PWR)

48
Q

What does FAILED mean on the EDCU CB Page?

A

The breaker itself has FAILED
It cannot be reset

49
Q

What does TRIPPED mean in the EDCU CB Page?

A

An overcurrent or under voltage has been detected and the virtual circuit breaker has been tripped.
It can be reset.

50
Q

Can you get a [1(2) BCU HOT] in flight?

A

No

51
Q

What are the affects of [MAIN/AUX BATT OFF]

A

Not being charged
Not connected as a backup

52
Q

What is powered when power is first applied (power up)

A

Batt Bus 1 & 2
ESS Bus 1 & 2
EMER BUS 1 & 2
(Main and NESS powered off to save battery)

53
Q

What maintains BATT, ESS and EMERG Busses whilst carrying out a Battery start?

A

AUX BATT

54
Q

At what Ng does the BCU terminate the starter motor?

A

52%

55
Q

At what Ng does the BCU turn the BSG into generation mode?

A

64% Ng

56
Q

What is cross-start assist?

A

The online GEN will assist the start of the second engine
Assisted by the main battery

57
Q

What’s happens to the EXT PWR once the generator is online

A

It is automatically disconnected from the EPGDS (EPC Open)
at 52% Ng

58
Q

What happens to Non-ESS Busbars during a single generator failure?

A

The Non-ESS Busses are automatically shed

59
Q

Can the shedding of the NON-ESS busses be overridden?

A

YES - via EDCU

60
Q

What conditions require and aborted engine start

A
  • No light up in 10
  • HOT START
  • ITT shows X
  • Hangs below 60%
  • START fails to disengage by 54%

AW169 Type Rating (Leonardo) (30 decks)

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