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My777-FAL > Electrical > Flashcards

Electrical Flashcards

1
Q

What causes the IDG drive to automatically disconnect from the engine?

A

High generator drive temperature

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2
Q

If electrical loads exceed the power available (airplane or external), ELMS automatically sheds the

A

C2 electric pump

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3
Q

How does the APU generator compare to the IDGs?

A

It is electrically identical to the IDGs

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4
Q

The entire airplane AC/DC electrical load is supplied by

A

any two main AC power sources

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5
Q

What does the main DC electrical system use to produce DC power?

A

TRU’s

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6
Q

The backup generator system automatically powers one or both transfer busses when

A

approach mode (APP) is selected

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7
Q

The ground handling bus powers the

A

The forward and aft cargo doors

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8
Q

Secondary external power can power the

A

Left and right main buses

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9
Q

United SOP concerning connecting external power dictates that primary external power

A

Is connected prior to secondary external power

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10
Q

Can you turn the battery off in flight?

A

No, the switch is inhibited

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11
Q

When will the backup generators automatically operate?

A

When power to one or both main AC buses is lost

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12
Q

Once one engine is started, with no other electrical source providing power and the BUS TIE switches are in AUTO, the _____ powers both main busses

A

IDG

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13
Q

If an IDG is manually disconnected in flight with the DRIVE DISC switch, can you reconnect it?

A

No, maintenance action is required on the ground

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14
Q

The _____ powers the AC standby bus if the left transfer bus is not powered.

A

Standby inverter

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15
Q

What is the maximum altitude for APU start?

A

43,100 feet

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16
Q

What happens to the APU and RAT when both transfer busses are lost in flight?

A

The API automatically starts and the RAT automatically deploys

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17
Q

When may the flight crew establish power to an unpowered airplane?

A

ONLY with maintenance approval

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18
Q

Each engine mounted backup generator contains _____ permanent magnet generator(s) (PMG).

A

2

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19
Q

The primary power sources for the flight control system are the ____ backup generator PMGs.

A

Left and right

20
Q

If demand from the RAT exceeds capacity to provide hydraulic and electrical power, which has priority?

A

Hydraulic power - electrical load is shed until satisfactory hydraulic pressure can be maintained

21
Q

If the electrical loads exceed power available (airplane or external), ELMS

A

Automatically sheds nonessential systems

22
Q

The main battery provides standby power to the

A

Hot battery bus, battery bus, and standby inverter.

23
Q

What are the components of the standby electrical system?

A

The main battery, standby inverter, RAT generator, and the C1 and C2 TRUs

24
Q

The main battery charger, when powered, will power the

A

Hot battery bus

25
Q

The ground service bus is normally powered by the right main bus. The _____ and _____ are alternate sources of power.

A

APU generator, primary external power

26
Q

Which of the following is NOT powered by the ground service bus?

A

Refueling panel

27
Q

If primary external power is powering one or both main busses, and then the APU is started, the APU automatically connects to _____ after reaching operating speed.

A

The left main bus

28
Q

The _____ normally supply power to the flight control DC electrical system

A

PMGs

29
Q

During power source transfers (such as switching from the APU generator to an engine generator) operating sources are momentarily paralleled to prevent power interruption

A

On the ground

30
Q

While on the ground, normally the IDG can be electrically disconnected from the main busses by selecting an external electric power source or

A

by selecting the GEN CTRL switch to OFF

31
Q

What does the illumination of a generator DRIVE light indicate?

A

Low IDG oil pressure

32
Q

The primary external power AVAIL light illuminates when th

A

Primary power source voltage and frequency are within limits

33
Q

The external AVAIL light means power is plugged in and

A

Voltage and frequencies are within limits but no yet selected / connected

34
Q

When the GEN CTRL switches are ON, the generator breaker is armed to close automatically when generator power is

A

Available

35
Q

Inflight, when both BUS TIE switches are set to AUTO, the priority for powering the left and right main busses is the

A

Respective IDG, APU generator, opposite IDG

36
Q

Pushing the CABIN/UTILITY power switch to OFF removes power from the

A

Ground service bus

37
Q

On the ground, power transfers are made without interruption, except when

A

Switching between primary and secondary external power sources

38
Q

When closed, the cockpit door locks automatically if electrical power is available and the Flight Deck Access System switch is powered. If pilots are inadvertently locked out of the cockpit, the only means of entry is to

A

Use the emergency access code or de power the airplane

39
Q

The BACKUP GEN OFF Light illuminated indicates

A

A backup generator failure, a circuit fault or the switch is off

40
Q

Pushing the IFE/PASS SEATS power switch to OFF removes power from what

A

All inflight entertainment components

41
Q

If the Emergency Lights are ARMED, they will automatically illuminate with the

A

Loss of DC power

42
Q

The emergency lighting system is powered by remote batteries that are charged by the airplane electrical system. Fully charged, the batteries can provide at least ____ minutes of operation.

A

15

43
Q

A white sterile cockpit light is located in the hallway on the ceiling panel above the cockpit door. The light automatically illuminates when altitude is _____ feet MSL and below, and the parking brake is not set.

A

10,000

44
Q

Emergency Lights that illuminate the cabin escape path and exits are controlled by the guarded EMER LIGHTS switch on the cockpit overhead panel and the guarded EMERG LIGHTS switch on the flight attendant panel at Door 1L. Which switch has priority?

A

When pushed ON, the flight attendant switch bypasses the cockpit switch regardless of the cockpit switch position (OFF, ARMED, or ON).

45
Q

Which EMER LIGHTS switch position(s) will allow the emergency lights battery packs to be charged?

A

All three positions

46
Q

The cabin FASTEN SEAT BELTS signs illuminate automatically when the SEAT BELTS selector is set to AUTO and which of the following conditions exist?

A

Landing gear not up and locked

47
Q

The IND LTS switch, when held in the TEST position, illuminates all annunciator lights to _____ brightness. After the switch has been held for 10 seconds, the lights _____ .

A

Full, dim

My777-FAL (18 decks)

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