Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Billy 190 Systems > Electrical > Flashcards

Electrical Flashcards

1
Q

What occurs after an engine start with the IDG selector knob set to the AUTO position?

A

The IDG will automatically come on line, powering the respective AC BUS and the previous power source
is disconnected from that AC BUS.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What occurs with BATT 2 during APU starting sequence?

A

BATT 2 is isolated from the network, powering the APU START BUS exclusively

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What action must be taken by the flight crew before disconnecting the AC GPU from the airplane?

A

The AC GPU push button must be pushed out to reset the system for the next connection even if the IN
USE light has already extinguished

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What minimum airspeed is required to ensure that the Ram Air Turbine (RAT) continues to power the AC/DC ESS BUSES after deployment?

A

130Knots

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What will cause the RAT to automatically deploy in flight?

A

Whenever AC power sources are not powering AC BUSES

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

A maximum of _________________ after deployment the RAT will supply power to the AC ESS BUS.

A

8 Seconds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the purpose of the No Break Power Transfer (NBPT) feature?

A

To provide protection against transient power interruptions while transitioning from one AC power source to another

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What provides the primary source of power for the DC electrical system?

A

The Transformer Rectifier Units (TRUs)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

With the DC BUS TIES toggle switch selected to AUTO, what would be the result of a Transformer Rectifier Unit
(TRU) failure?

A

All DC BUSES will continue to be powered through the remaining TRUs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

In an ELECTRICAL EMERGENCY how long will the batteries supply essential loads without the RAT?

A

Approximately 10 minutes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How are the batteries charged?

A

The batteries are constantly charged by any AC source through the TRUs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The source priority order for powering AC main buses is:

A

Respective IDG, APU Generator, GPU (if no APU power), Opposite IDG

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

If a power-generating source fails, the electrical system automation supplies electrical power from another available source according to the priority order. If required, the Secondary Power Distribution Assembly (SPDA) will:

A

Command the load shedding protection, isolating galleys and right windshield heating to prevent an
overload on the remaining source

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does an illuminated AVAIL light in the GPU push button indicate?

A

An operating ground power unit is properly connected to the airplane and AC power quality requirements
are satisfied

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does an illuminated IN USE light in the GPU push button indicate?

A

The GPU push button has been pushed in and the GPU is the source of AC power for the airplane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

During the Safety & Power On Checklist, after placing BATT 1/BATT 2 to ON/AUTO, BATT 1 and BATT 2 voltage
reads less than 22.5 volts but more than 21.0 volts. How should the flight crew proceed?

A

Recharge the batteries prior to takeoff through any AC source (including engines during taxi) per the table
in OM Vol I, 2a.2.1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

When is the Electrical PBIT performed and how long does it take to complete?

A

Automatically performed after the aircraft is powered by any AC source and takes 3 minutes to complete

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What does illumination of the amber LED on the IDG control panel indicate?

A

High oil temperature or low oil pressure has been detected in the IDG

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What occurs to the IDG when the DISC position is selected and held for one second?

A

The IDG is mechanically disconnected and can only be reconnected on the ground by maintenance

20
Q

What does a white IDG icon displayed on the MFD Electrical Synoptic page indicate?

A

The IDG is available and the IDG selector knob is in the OFF position, or the engine is not running

21
Q

What checklist would be used for powering up the aircraft?

A

The Safety and Power On Checklist

22
Q

What does the OFF position of the IDG selector knob do?

A

Opens the IDG contactor isolating the IDG from its respective AC BUS

23
Q

What is the normal position of the APU pushbutton?

A

IN

24
Q

What does the AUTO position of the AC BUS TIES knob do?

A

Allows automatic operation of the electrical system controlling the operation of the Bus Tie Contactors
according to system logic

25
Q

What does the 1 OPEN position of the AC BUS TIES switch do?

A

Opens Bus Tie Contactor 1 which segregates AC BUS 1 from AC BUS 2

26
Q

With both batteries selected OFF, which electrical buses are powered?

A

Hot Battery Bus 1 and 2

27
Q

What occurs when BATT 1 selector is placed ON?

A

Battery 1 is connected to the DC ESS BUS

28
Q

What additional buses are powered when BATT 1 is placed to ON and BATT 2 is placed to AUTO?

A

All Essential DC Buses and the AC Standby Bus

29
Q

What does the AC Standby Bus power?

A

The A Ignition Exciters for Engine 1 and Engine 2

30
Q

After the RAT deploys what supplies electrical power until the RAT has come up to speed?

A

Battery 1 and Battery 2

31
Q

What normally powers the AC ESS BUS?

A

AC Bus 2

32
Q

How can the Flight Crew view/control the status of Electronic Circuit Breakers?

A

In the MCDU on the CB MENU page

33
Q

An important note to remember when accomplishing the Safety and Power On Checklist is:

A

To avoid battery depletion, establish AC electrical power as soon as possible

34
Q

What is the purpose of the AUTO position of the BATT 2 Selector Knob

A

Allows automatic operation according to system logic

35
Q

What would be displayed on the MFD Electrical Synoptic page if EICAS displays a TRU 1 FAIL Caution message?

A

TRU 1 icon will be white beneath an amber cross

36
Q

What would cause an EICAS Caution message GPU CONNECTED to be displayed?

A

Whenever an AC or DC Ground Power Unit is connected to the aircraft and the parking brake is released

37
Q

At the end of a flight an aircraft pulls into the gate, a Ground Power Unit is connected, and the AVAIL light displaysin the GPU pushbutton. The push button is pushed IN. When would the AVAIL light extinguish and the IN USE light display in the GPU pushbutton?

A

As soon as at least one engine is shut down with the APU not running

38
Q

When the associated battery temperature reaches 70 degrees C for at least 2 seconds, the following is triggered?

A

The EICAS Warning message BATT 1 (2) OVERTEMP is annunciated

39
Q

What will occur on the ground if the aircraft is powered only by the batteries for more than 5 minutes?

A

A horn will sound to alert the ground personnel

40
Q

The DC electrical system consists of two batteries and how many Transformer Rectifier Units (TRUs)?

A

3

41
Q

What is the purpose of the AC/DC inverter?

A

To supply AC power to the STANDBY AC BUS when an AC power source is not available

42
Q

What occurs during the pre-flight phase to the GPU pushbutton when the APU comes on line

A

The AVAIL light illuminates and the IN USE light extinguishes

43
Q

The AVAIL light illuminates and the IN USE light extinguishes

A

The ESS AC BUS will not be powered

44
Q

How does the Flight Crew reconnect an IDG in flight after it has been disconnected?

A

The flight crew cannot reconnect the IDG

45
Q

What action(s) can the Flight Crew take to avoid power interruptions?

A

Check the MFD Electrical Synoptic Page to provide visual confirmation of power transfer

46
Q

What condition in flight causes an ELEC EMERGENCY Warning message on EICAS?

A

Both main AC buses de-energized

Billy 190 Systems (15 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions