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A300 MQB > Electrical > Flashcards

Electrical Flashcards

1
Q

What is the normal electrical supply for AC EMER BUS?

A

AC ESS BUS

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2
Q

How is an IDG disconnect confirmed?

A

The IDG FAULT light extinguishes and Gen FAULT light

illuminates

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3
Q

The IDG is disconnected while airborne, when can the IDG be reconnected?

A

Only by a mechanic when on the ground

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4
Q

In the A300 electrical system, what are the 4 AC buses?

A

AC EMER, AC ESS, and AC #1 & #2

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5
Q

What is the normal electrical supply for AC ESS BUS?

A

AC bus #1

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6
Q

What happens when both AC OVRD Supply switches are

selected ON?

A

AC EMER, AC ESS, and DC ESS are the only busses supplied

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7
Q

If the AC ESS BUS is lost, how may the AC EMER BUS be

supplied?

A

DC ESS BUS via automatic activation of the Emergency Static

Inverter

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8
Q

In the A300 electrical system, what are the three DC Buses?

A

HOT Battery Bus, DC ESS, and DC NORM

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9
Q

Which switch will manually connect the batteries to the DC

ESS bus?

A

BAT OVRD

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10
Q

What is lost with the BAT OVRD switch selected ON?

A

STBY GEN operation, BAT overheat protection, BAT charging

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11
Q

Avionics smoke drill is equivalent to standby generator in that
they both have three buses that are de-energized. What three
busses are they?

A

AC Bus 1 & 2 and DC Norma

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12
Q

How does selecting the LAND RECOVERY switch ON affect the

STBY GEN operation?

A

It disconnects the DC ESS BUS from the STBY GEN and uses the

batteries to power the DC ESS BUS

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13
Q

Which system is not recovered with the LAND RECOVERY

switch selected ON?

A

Kruger Flaps

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14
Q

Selecting the MECH CALL HORN CTL switch (on the overhead

panel) to ON does what?

A

It deactivates the nose gear mechanic call horn for battery

discharge on an unpowered aircraft

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15
Q

If OVRD SUPPLY #1 is supplying AC ESS BUS, and the #1 IDG

fails, how is power restored to the AC ESS BUS?

A

Deselect OVRD SUPPLY #1 then Select OVRD SUPPLY #2 ON

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16
Q

During an electrical emergency, what items are recovered

when the LAND RECOVERY switch is selected ON:

A

1 slat motor, 1 flap motor, spolier/speedbrake/ground spoiler
panels 2,3,5,7, Normal Brakes, Normal Anti-Skid

17
Q

In normal operation, what powers AC BUS 2?

A

GEN 2

18
Q

If AC ESS BUS is lost due to a fault on the AC BUS #1, how is
power restored to the AC ESS BUS?

A

Select OVRD SUPPLY 1 switch to ON

19
Q

During STBY GEN operation, if an APU start is unsuccessful,
why is it important to place the APU Master switch back to the
OFF position?

A

To re-connect the DC Standby generator and disconnect the 3

batteries from the DC Ess Bus

20
Q

How can the crew confirm that the standby generator is

operating and supplying power to the electrical system?

A

The Blue AC EMER ON INV light and the Amber DC ESS ON BAT

lights are extinguished and Fuel Crossfeed valve is in-line

21
Q

The aircraft is in-flight, the #1 engine has failed, and the APU
is not operating, how will the electrical system be configured?

A

GEN 2 automatically powers AC BUS 1

22
Q

What will the Battery Charge Controller (BCC) do if BAT 1

overheats?

A

Automatically disconnect BAT 1

23
Q

A Fault is detected on AC BUS 1 and it is disconnected, which
switch will connect GEN 2 to the AC ESS BUS directly?

A

OVRD SUPPLY 2

24
Q

The APU is operating and EXT PWR is connected and selected
ON. In this configuration, what is supplying the electrical
system?

A

EXT PWR, it has priority over the APU GEN

25
Q

What is the NORMAL supply for DC ESS BUS?

A

DC NORM BUS via DC BUS TIE and the ESS TR

26
Q

Which electrical busses does the Standby Gen supply?

A

DC ESS bus, AC ESS #2 bus, AC EMER bus

27
Q

If the aircraft batteries are the only source of electrical power,
what busses will they supply?

A

DC ESS BUS and AC EMER BUS

28
Q

With the Standby Generator running, what happens if the BAT

OVRD is selected ON?

A

Standby Gen quits supplying the emergency electrical system

29
Q

When does the Battery Charge Controller (BCC) not connect

the batteries to the DC ESS BUS?

A

DC ESS BUS supplied by Standby Gen

30
Q

If all electrical power sources are available, what is the auto
switching priority of the AC electrical system?

A

Onside Gen, Ext power, APU, Other Gen

31
Q

In the electrical system the green flow bars on the battery tiles
are an indication that the battery tiles are in what state?

A

Connected to the DC ESS bus

32
Q

In the electrical system, what items are not on the HOT

battery BUS?

A

Eng and Cargo Fire detection systems

33
Q

What is the DC NORMAL Bus powered by?

A

TR 1 & 2

34
Q

When powering up an unpowered aircraft, what is indicated if
the blue AC EMER ON INV light does not illuminate when the
batteries are switched on?

A

A fault with the Inverter

35
Q

Illumination of the AC BUS 1 OFF, AC ESS BUS, and AC EMER
ON INV lights while inflight indicates that this component has
failed.

A

AC BUS #1

36
Q

Both generators fail in-flight. The standby generator fails to
automatically start. Which switch can manually start the
standby generator?

A

STBY GEN

A300 MQB (22 decks)

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