BE400 Electrical

Question 0

What are the power sources for the DC electrical system?

Answer 0

Battery, external power, generators

Question 1

When is a GPU start recommended?

Answer 1

Ambient temperatures below -15C.

Question 2

What are the 3 separate parts of the electrical system?

Answer 2

28V DC, 115/26V AC, Standby power

Question 3

What makes up the 28V DC system?

Answer 3

1 main battery, 1 standby battery, 2 engine generators, external power

Question 4

What bus is used for battery charging?

Answer 4

Battery charge bus

Question 5

What powers the emergency bus?

Answer 5

The L load bus or the emergency battery

Question 6

Where is the standby battery located?

Answer 6

The nose electronic compartment

Question 7

What type of battery is the emergency battery?

Answer 7

24 volt 5 amp/hour

Question 8

What’s the amperage of the 28V GPU?

Answer 8

1000-1500 amps

Question 9

What cools the DC generators?

Answer 9

Ram air in flight and fans on the ground

Question 10

Are batteries used during cross-generator starts?

Answer 10

Yes. To achieve a faster, cooler start

Question 11

When is the GEN relay opened automatically?

Answer 11

GCU detects a malfunction or Fire switch light has been pushed

Question 12

What protection does the GCU incorporate?

Answer 12

Reverse current, differential fault, over voltage(32 volts), ground faults

Question 13

When is the Gen Relay light expected to be on?

Answer 13

When respective Gen switch is off, when a fire switch light had been pushed, N2 less than 35-45% and/or start select on L/R, or Gen failure

Question 14

What does L/R GEN OFF light mean?

Answer 14

GEN relay is open

Question 15

When will a generator trip?

Answer 15

• overvoltage
• feeder faults
• engine fire switch

Question 16

What is the purpose of the load bus tie relay?

Answer 16

Connects left and right load buses to run off one power source

Question 17

What is the purpose of the load bus tie over-current relay?

Answer 17

To protect l/r secondary distribution system in case of a short

Question 18

Load bus tie relay opens if over-current exceeds…

Answer 18

100 amps

Question 19

Can you reset bus tie over current manually?

Answer 19

Yes

Question 20

What is required to close the Utility Bus relay (RCCB)?

Answer 20

EXT PWR on or both generators on

Question 21

Where does battery normally receive power?

Answer 21

BATT Charge Bus

Question 22

The battery is also connected to which bus?

Answer 22

Start bus

Question 23

With GEN MASTER switches in EMER, what will placing the battery switch in EMER do?

Answer 23

Connect battery bus to EMER BUS

Question 24

What do feeder cables do?

Answer 24

Provide connection between power sources and load buses

Question 25

Which components are powered by Standby Power?

Answer 25

• Standby Att. Indicator
• Standby Alt. Vibrator
• Backlighting for stby: att ind., alt., airspeed ind., magnetic compass
• STBY ARM/ON light
• Left ITT
• RTU 1

Question 26

What is the power source for the 115/26V AC system?

Answer 26

2 static 115/26V AC 400Hz inverters powered by DC system

Question 27

What powers the emergency lighting?

Answer 27

Two 6VDC lead-acid batteries. One under cabin floor, one behind the aft pressure bulkhead