Electrical - DC

Question 1

How many batteries and what type are installed?

Answer 1

2, Lead Acid

Question 2

What is the Amp Hour rating for each battery?

Answer 2

BATT 1: 34
BATT 2: 36 (48 with mod)

Question 3

What is the minimum voltage required for a battery start?

Answer 3

24v

Question 4

What is the minimum recommended battery temperature for battery start?

Answer 4

Standard: -10 C
Modified: -18 C

Question 6

On ground, BATT 1, BATT 2 in the OFF position. Which buses are powered?

Answer 6

HOT BATT BUS 1
HOT BATT BUS 2

Question 7

On ground, BATT 1 & BATT 2 in the ON position. Which buses are powered?

Answer 7

-HOT BATT BUS 1
-HOT BATT BUS 2
-EMERGENCY BUS
-DC BUS 1
-DC BUS 2
-CENTRAL BUS

Question 8

What is the voltage range for the aircraft to accept GPU power?

Answer 8

25-30V

Question 9

What is the indication that the aircraft will accept GPU power?

Answer 9

GPU AVAIL (white) switch illuminated

Question 10

What is the function of the 1 OPEN or 2 OPEN position of the BUS TIE switch?

Answer 10

Forces the respective bus tie open against logic. The opposite side functions normally.

Question 11

On ground, BATT 1 & BATT 2 in the ON position, GPU connected/powered, and GPU button pushed in, electrical system indicates 28V. Which buses are powered?

Answer 11

-HOT BATT BUS 1
-HOT BATT BUS 2
-EMERGENCY BUS
-DC BUS 1
-DC BUS 2
-CENTRAL BUS
-SHED BUS 1
-SHED BUS 2

Question 12

Which buses and equipment are powered by BATT 2 during engine start?

Answer 12

-HOT BATT BUS 2
-CENTRAL BUS
-ENGINE STARTER

Question 13

Which buses are powered by BATT 1 during engine start?

Answer 13

-HOT BATT BUS 1
-EMERGENCY BUS
-DC BUS 1
-DC BUS 2

Question 14

How does DC BUS 2 receive power during engine start?

Answer 14

Quiet Start Contactor

Question 15

Which buses are depowered during engine start?

Answer 15

-SHED BUS 1
-SHED BUS 2

Question 16

What is the position of the following contactors during engine start?

Answer 16

-Bus Tie Contactor (BTC) 1: Open
-Bus Tie Contactor (BTC) 2: Open

Question 17

What is the position of the following contactors during normal operation?

Answer 17

-Bus Tie Contactor (BTC) 1: Open
-Bus Tie Contactor (BTC) 2: Closed

Question 18

In flight , normal operation. Which buses are powered by GEN 1?

Answer 18

-HOT BATT BUS 1
-EMERGENCY BUS
-DC BUS 1
-SHED BUS 1

Question 19

In flight, normal operation. Which buses are powered by GEN 2?

Answer 19

-HOT BATT BUS 2
-CENTRAL BUS
-DC BUS 2
-SHED BUS 2

Question 20

In flight, GEN 1 failure. What is the position of the following contactors?

Answer 20

-Generator Line Contactor 1: OPENS
-Shed Bus Contactor 1: OPENS
-Shed Bus Contactor 2: OPENS
-Bus Tie Contactor 1: CLOSES
-Bus Tie Contactor 2: REMAINS CLOSED

Question 21

In flight, GEN 1 already failed, now GEN 2 fails (Electrical Emergency). What is the position of the following contactors?

Answer 21

-Generator Line Contactor 1: REMAINS OPEN
-Generator Line Contactor 2: OPENS
-Shed Bus Contactor 1: REMAINS OPEN
-Shed Bus Contactor 2: REMAINS OPEN
-Bus Tie Contactor 1: OPENS
-Bus Tie Contactor 2:OPENS
-Emergency Bus Contactor 1:OPENS
-Emergency Bus Contactor 2:CLOSES

Question 22

What is the battery duration in the Electrical Emergency configuration following automatic or manual electrical transfer?

Answer 22

45 Min

Question 23

What is the purpose of the ELEC EMER button?

Answer 23

The ELEC EMER button manually forces the contactors into the electrical emergency configuration in the event system logic fails to complete transfer.