ELECTRICAL

Question 1

Max permissble time for ground operation with the battery power only?

Answer 1

5 minutes, to prevent the EICAS CRT screens from overheating

Question 2

Where is the external AC power receptacle located?

Answer 2

Lower, right side, forward nose area

Question 3

What is the AC electrical system rated at?

Answer 3

115 VAC, 400 HZ, 3 phase

Question 4

What is the voltage rating of the DC electrical system?

Answer 4

28 VDC

Question 5

What is an Integrated Drive Generator (IDG)?

Answer 5

An AC generator combined with a constant speed drive.

Question 6

Max engine generator load

Answer 6

40 KVA to 41,000 ft

Question 7

what is a TRU?

Answer 7

Transformer rectifier unit

Question 8

What is the function of the TRUs?

Answer 8

To convert 115 VAC to 28 VDC

Question 9

Max TRU load

Answer 9

120 amps

Question 10

How many TRUs are installed in the CRJ 900?

Answer 10

4

Question 11

Where are the TRUs located?

Answer 11

In the nose compartment

Question 12

How are the TRUs cooled?

Answer 12

Cooling fans located under the TRUs

Question 13

When do the TRUs come online?

Answer 13

When AC busses are powered

Question 14

Where is the main battery located?

Answer 14

In the nose compartment

Question 15

Main battery rating

Answer 15

24 VDC/17 amp hour

Question 16

Where is the APU battery located?

Answer 16

In the aft equipment bay

Question 17

APU Battery rating

Answer 17

24 VDC/43 amp hour

Question 18

How many generators are on the CRJ 900?

Answer 18

4 (2 engine generators, 1 APU generator, 1 ADG)

Question 19

What happens when the Battery Master switch is selected ON?

Answer 19

The main battery bus will be powered by the main battery direct bus, and the APU battery direct bus

Question 20

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

Answer 20

Yes

Question 21

What controls the DC bus tie contactors?

Answer 21

The DC power centers (DCPC) automatically control DC bus tie contactors

Question 22

When will the air driven generator (ADG) automatically deploy?

Answer 22

With complete loss of A/C power.

Question 23

With the ADG deployed, what items are powered?

Answer 23

AC ESS bus, hydraulic pump 3B, flaps/slats, STAB trim CH2

Question 24

ADG max load

Answer 24

15 KVA

Question 25

Minimum airspeed to configure the aircraft for landing on ADG power?

Answer 25

140 kts