Electrical

Question 1

How many batteries power the airplane?

Answer 1

Two

Question 2

What type of batteries?

Answer 2

Lead-Acid

Question 3

Where are the batteries located?

Answer 3

1 in the nose, #2 behind right wing root

Question 4

Battery volts and amps.

Answer 4

24VDC
#1 34 Ah
#2 48 Ah

Question 5

Which battery provides power for starting?

Answer 5

2

Question 6

Minimum voltage for starting?

Answer 6

24 Volts

Question 7

Minimum voltage for charging?

Answer 7

27 Volts

Question 8

How many generators

Answer 8

Two

Question 9

Generator voltage

Answer 9

28 VDC

Question 10

Generator amps?

Answer 10

400 amps

Question 11

Generator load limits

Answer 11

330A on ground
390A in air

Question 12

Minimum battery temp for normal ops?

Answer 12

-10C (14F)

Question 13

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

Answer 13

Quiet start contactor

Question 14

If a single generator fails in flight, what happens?

Answer 14

Both SHED BUSES lose power

Question 15

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

Answer 15

DC power requirement between 25V-30V is not being met.

Question 16

What are we looking for when we push in the electrical emergency button on the after start checklist?

Answer 16

That both batteries show at least 23.5 volts
(The generators continue to power the DC busses in this scenario, but certain
other relays open in order to confirm battery voltage).

Question 17

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

Answer 17

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

Question 18

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

Answer 18

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 19

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

Answer 19

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 20

How long do the batteries provide power in a dual gen failure?

Answer 20

45 Minutes max

Question 21

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

Answer 21

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 22

What is normally powered by Starter Generator 1?

Answer 22

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

Question 23

What is normally powered by Starter Generator 2?

Answer 23

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