ELECTRICAL SYSTEM

Question 1

How many batteries power the airplane?

Answer 1

Two.

Question 2

What type are they?

Answer 2

Lead-Acid

Question 3

Where are they located?

Answer 3

1 in the nose; #2 behind rt. wing root.

Question 4

How many volts and amps for each?

Answer 4

24VDC; 34 Ah, 36 Ah

Question 5

Which battery provides electrical power for engine starting?

Answer 5

2 battery

Question 6

What is the minimum voltage for starting? Charging?

Answer 6

24 volts 27 volts

Question 7

How many generators? Volts? Amps?

Answer 7

Two 28 VDC 400 amps

Question 8

What are the generator loads?

Answer 8

Ground=330A In-Flight=390A

Question 9

What is the minimum battery temperature for normal operation?

Answer 9

-10C (14F)

Question 10

What function in the electrical system allows the engine to start without
causing surges in the Avionics?

Answer 10

Quiet Start Contactor.

Question 11

If a single generator fails in-flight, what happens?

Answer 11

Both SHED BUSES lose power.

Question 12

What does it mean if the GPU is plugged in, but there is no GPU AVAIL light
illuminated on the button?

Answer 12

DC power requirement from the GPU of between 26V and 29V is not being met.

Question 13

What are we looking for when we push in the Electrical Emergency Button on
the before taxi checklist?

Answer 13

That the batteries show at least 23.5 volts.

Question 14

If the GPU is powering the airplane, when do the generators come on line?

Answer 14

When the GPU is disconnected (from the Central Bus) which can be confirmed on
the electrical synoptic page

Question 15

If the GPU is connected and the Electrical Emergency Button is pushed in, what
happens?

Answer 15

Because the generators are not on-line yet, the electrical system is forced into
electrical emergency, connecting the batteries directly to the emergency buss.
(The GLC 1, GLC 2, SBC 1 and SBC 2 will be commanded to open, and BTC 1 and
BTC 2 will be hardwire locked out, EBC 1 will open and EBC 2 will close).
The Batteries 1 and 2 will supply power to the HOT BATT BUSES, EMERGENCY BUS
and the CENTRAL BUS.

Question 16

If a Dual Generator failure occurs in flight, what remains powered?

Answer 16

The aircraft wiring logic will automatically configure the electrical emergency
scenario. The Batteries 1 and 2 will supply power to the HOT BATT BUSES,
EMERGENCY BUS and the CENTRAL BUS providing engine starting.

Question 17

For approximately how long?

Answer 17

45 minutes max.

Question 18

If while in flight, the CAS message ELEC XFR FAIL appears, what is the
memory item and why is this procedure necessary?

Answer 18

ELEC EMER BUTTON…………PUSH IN
A complete in-flight loss of the main generating system has occurred, but the
automatic transfer logic has failed to configure the electrical emergency condition,
so pushing in the button allows the pilot to override the automatic transfer failure
and enable the load shedding process by forcing the system into the electrical
emergency condition.

Question 19

What is normally powered by Starter Generator 1?

Answer 19

DC BUS 1, SHED BUS 1, EMERGENCY BUS and HOT BATT BUS 1

Question 20

What is normally powered by Starter Generator 2?

Answer 20

DC BUS 2, SHED BUS 2, CENTRAL BUS, HOT BATT BUS 2.