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* B777 CATHEY STUDY GUIDE COPY > ELECTRICAL > Flashcards

ELECTRICAL Flashcards

1
Q

What is the purpose of ELMS?

A

To provide load management and protection to ensure power is available to critical and essential equipment

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2
Q

What loads does ELMS shed first?

A

Galleys first and then utilities

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3
Q

What indication is there of ELMS load shedding?

A

LOAD SHED on EICAS

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4
Q

List the main electrical sources?

A

L GEN
R GEN
APU GEN
Primary and secondary EXT power

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5
Q

What will cause the EICAS message ELEC GEN DRIVE?

A

Low oil pressure being detected in an IDG

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6
Q

What causes automatic disconnection of an IDG?

A

High drive temperature

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7
Q

When will the APU start automatically?

A

If both transfer busses are unpowered

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8
Q

When does the EXT PWR AVAIL light illuminate?

A

When the external power source voltage and frequency are within limits

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9
Q

What is the generator priority for main busses?

A

In flight:

  1. The respective IDG
  2. APU
  3. Opposite IDG
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10
Q

What is normally the source for the ground service bus?

A

The right main bus

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11
Q

How is the ground service bus powered without supplying the main busses?

A

With the APU running or primary external power connected there is a switch on the L1 service panel that will power the ground service bus only

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12
Q

What Equipment is powered by the Ground Service Bus?

A

Main battery charger
APU battery charger
Miscellaneous cabin systems and loads

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13
Q

How can the Ground Handling Bus be powered?

A

From APU GEN or Primary EXT PWR Bus

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14
Q

What Equipment is powered by the Ground Handling Bus?

A

Cargo handling

Fueling/de-fueling

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15
Q

Which busses can be supplied by the Back up GENs?

A

R AC transfer Bus

L AC transfer Bus

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16
Q

What unit converts the Back up GENs frequency?

A

A frequency converter

17
Q

How many back up generators can be used at a time?

A

Only one, as they both connect to the same frequency converter

18
Q

How many PMG are in each back up generator?

A

2

19
Q

What are the two PMGs in each back up generator used for?

A

Supplying DC Power to the flight control DC electrical system

20
Q

How are the TRUs supplied?

A

By the AC transfer busses

21
Q

What normally powers the HOT BAT BUS?

A

The main battery charger

22
Q

What is the purpose of the APU battery?

A

To provide dedicated Power to the APU Electric starter and APU control unit in case there is insufficient bleed air duct pressure for the APU air turbine starter (ATS)

23
Q

What is the secondary power source for the C FCDC PSA?

A

The captains flight instrument bus

24
Q

Which FCDC PSAs can be powered by the hot battery bus?

A

The left and Centre PSAs

25
Q

How long can the dedicated PSA battery provide Power for?

A

Max 10 minutes

26
Q

What is the purpose of the dedicated PSA battery?

A

To prevent interruptions to the related flight control DC bus

27
Q

What type of power is provided by the stand by electrical system?

A

DC and AC power

28
Q

What does the standby electrical system supply?

A

Selected flight instruments, Communications and navigation systems and the flight control system
AC: Center ILS, Radio alt, ENG igniters, VOR left
DC: Captains and F/O s flight instument displays

29
Q

When does the static inverter supply the AC stanby bus?

A

If the left transfer bus is not powered

30
Q

What are the two sources of Power for the AC standby bus?

A

BAT BUS and C1+C2 via the static inverter

31
Q

What does the RAT generator supply?

A

The C1 and C2 TRUs

32
Q

What are the altitude and airspeed limitaitons on the AR?

A

There are none, the RAT operates at all airspeeds and altitudes

33
Q

What supplies power until the RAT RPM is sufficient?

A

The main battery

34
Q

What will cause automatic deployment of the RAT?

A

Both AC transfer busses losing power in flight

All HYD systems are low

35
Q

What is DC Power used for?

A

Flight displays (PFD and ND)
GPS
ADIRU

* B777 CATHEY STUDY GUIDE COPY (21 decks)

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