Electrical

Question 1

Location of the APU battery?

Answer 1

Aft equipment bay

Question 2

Max engine generator load?

Answer 2

40 KVA

Question 3

Max APU generator load?

Answer 3

40 KVA

Question 4

Max transformer rectifier unit (TRU) load?

Answer 4

120 AMPS

Question 5

Max permissible time for ground operations with battery power only?

Answer 5

5 minutes

Question 6

What is the reason for the Max ground operation time with battery power only?

Answer 6

To prevent ED1 and ED2 from overheating (fans are AC powered)

Question 7

How many TRU’s are installed in the CRJ900

Answer 7

4

Question 8

Where are the TRU’s located?

Answer 8

Nose compartment

Question 9

The main battery is rated for?

Answer 9

17 amps / 24 volts

Question 10

APU battery is rated to?

Answer 10

43 amps / 24 volts

Question 11

How many generators are installed?

Answer 11

4

2 IDGS, 1 APU, 1 ADG

Question 12

What is the function of the TRU’s

Answer 12

To convert 115 volt AC to 28 volt DC

Question 13

How are the TRU’s cooled?

Answer 13

Individual fans

Question 14

Which buses are powered when the battery master switch is selected on?

Answer 14

Main battery direct bus
APU battery direct bus
DC battery bus

Question 15

If the main buses are powered, are the essential buses automatically powered?

Answer 15

Yes

Question 16

Is there an on/off switch for the TRU’s

Answer 16

No. They are automatically powered when the AC buses are powered on.

Question 17

What controls the DC tie contactors?

Answer 17

The DC Power Centers (DCPC) automatically control DC tie operation.

Question 18

When will the Air Driven Generator (ADG) automatically deploy?

Answer 18

With complete loss of all AC power.

Question 19

With the ADG deployed, what are the basic items that are powered?

Answer 19

AC ESS bus
Hydraulic pump 3B
Flaps/slaps
STAB trim CH 2

Question 20

What is the ADG max load?

Answer 20

15 KVA

Question 21

Location of the main battery?

Answer 21

Nose compartment