Electrical

Question 1

What kind of batteries are installed in BJM’s Hawker’s?

Answer 1

Lead Acid.

Question 2

What are the lead-acid batteries rated at?

Answer 2

24 volts and 28 Amp Hours.

Question 3

What is the maximum continuous generator load limit?

Answer 3

300 Amps

Question 4

How can a generator be manually disconnected from its PS bus?

Answer 4

Select the generator switch to TRIP.

Question 5

How can the battery charge rate be monitored?

Answer 5

Depress the ammeter BATT push button.

Question 6

How can the ammeter scale be enlarged for more accurate viewing?

Answer 6

While holding the depressed BATT push button, depress the 0-40 button.

Question 7

Where is the ground power receptacle?

Answer 7

On the right rear fuselage.

Question 8

The initial selection of the battery switch to ON causes:

Answer 8

It closes both emergency contactors supplying power from both batteries to the PE bus.

Question 9

With the battery switch selected ON, the power to close both emergency contactors is provided by:

Answer 9

With the battery switch ON, the power from battery 1 closes both emergency contractors.

Question 10

When charging batteries from a GPU, how may charge rate be confirmed?

Answer 10

By a BATT amp reading on the overhead panel when pushing the AMP BATT push button.

Question 11

After starting both engines using external power, what actions should be taken?

Answer 11

• Select STARTER POWER switch - OFF
• EXT POWER switch - OFF
• External Supply - Disconnect
• Check batteries charging

Question 12

May the airplane engine or APU generators be used to assist ground power in starting an engine?

Answer 12

• NO. When ground power is used the engine and APU generator line contactors are held open.

Question 13

When using external ground power, the bus bar system is energized only when the ground power voltage is between _______ and _______ volts.

Answer 13

• 24.5 and 29.5 Volts

Question 14

The maximum battery charge rate immediately before takeoff shall not be greater than:

Answer 14

• 20 Amps

Question 15

Why is the battery charge rate limited immediately before takeoff?

Answer 15

• To ensure that there will be a minimum of 10 minutes battery power available immediately after takeoff in the event of a double generator failure.

Question 16

With both generators online and the bus tie closed the maximum permissible discrepancy between 1 and 2 ammeter is:

Answer 16

• 40 Amps

Question 17

For normal flight, the standby inverter switch should be selected to which position?

Answer 17

• Arm

Question 18

From what four sources may main aircraft batterie’s be charged?

Answer 18

• The left and right engines starter-generator, the APU starter-generator and a GPU.

Question 19

For external power starts, the ground power unit must supply_____Volts. It must have a short term capacity of ______ Amps and be fitted with a _____ Amps current limiter.

Answer 19

• 28 Volts
• 1,500 Amps
• 1,100 Amps

Question 20

When charging the aircraft batteries using ground power (GPU), the EXT BATT CHG switch must be selected off when the charge current drops to less than ____ Amps.

Answer 20

• 5 Amps

Question 21

Two ____ Volt-Amps (V_A) or two _____ V_A static inverters in the rear bay supply _____ Volts at ____ Hertz for AC powered services.

Answer 21

• 1,250 V_A
• 1,500 V_A
• 115 Volts
• 400 Hertz

Question 22

The APU generator provides _____ Volts DC power?

Answer 22

• 28 Volts

Question 23

When the APU generator comes on line it energizes bus bars ____, ____ and ____ and connects the number ____ battery to it’s charge circuit?

Answer 23

• PS-2, PE, PE-2
• two

Question 24

After the APU comes on line, which switch must be selected to connect the number one battery to it’s charging circuit?

Answer 24

• The bus tie.

Question 25

What is the purpose of the bus tie?

Answer 25

• The bus tie connects the PS-1 and PS-2 bus. Opening the bus tie separates PS-1 and PS-2.

Question 26

During external battery charging the battery contactors will be opened to discontinue charging in the event, charge voltage drops below ___ Volts or rise above ___ Volts?

Answer 26

• 24.5 and 29.5 Volts

Question 27

Under normal conditions, the number 1 inverter powers:

Answer 27

• XS-1 Bus and XE bus.

Question 28

Under normal conditions, the number 2 inverter powers:

Answer 28

• XS-2 bus

Question 29

The captain’s EFIS panels are powered by instrument transformer number 1 which receives power from:

Answer 29

• XE bus

Question 30

The copilot’s EFIS panels are powered by instrument transformer number 2 which receives power from:

Answer 30

• XS-1

Question 31

Transient excursions of engine generator load of up to a max of 400 Amps are allowed for a maximum of?

Answer 31

• 2 minutes

Question 32

The purpose of the standby inverter is:

Answer 32

• To power the XE bus providing power for the captain’s flight instruments in the event of a dual main inverter failure.

Question 33

When the BATT switch is in the BATT EMERG position, what is the source of power for closing the emergency contactors?

Answer 33

• When the BATT switch is in the EMERG position, both batteries supply power to both emergency contactors to connect both batteries to PE.

Question 34

The battery isolate switch may be used to isolate:

Answer 34

• The battery isolate switch may be used to isolate EITHER battery 1 or battery 2 from it’s charging source.