900 Electrical

Question 1

Each IDG consists of

Answer 1

A constant speed drive and a generator

Question 2

The IDG automatically disconnects when

Answer 2

tempurature or torque limits are exceeded.

Question 3

The ADG continues to operate and supply power to the ADG bus until what airspeed?

Answer 3

Approximately 140 kts

Question 4

Can the ADG deployed on the ground?

Answer 4

Automatic deployment is inhibited on the ground by a wait on wheels switch.

Question 5

The power supply priority for AC electrical is

Answer 5

On side generator

APU

Off side generator

Ground power

Question 6

What power sources are available for the service configuration

Answer 6

Either external power or the APU generator

Question 7

What buses are powered in the service configuration

Answer 7

AC service bus

Question 8

The ADG is automatically deployed if

Answer 8

there is a loss of power to both AC bus 1 and 2.

Question 9

The ADG bus supplies power to

Answer 9

The AC Essential bus

Hydraulic pump 3b

Flaps and slats at half speed

Pitch trim channel 2

Question 10

Main battery amp and volt

Answer 10

17 amp hour /24 volt nickel cadmium battery

Question 11

APU battery amp and volt

Answer 11

43 amp hour. 24 V nickel cadmium battery

Question 12

From what source is each battery charged?

Answer 12

The main battery is charged by AC bus one.

The APU battery is charged by AC service bus.

Question 13

The APU generator is driven by

Answer 13

Directly by the APU gearbox

Question 14

What powers the DC emergency bus

Answer 14

The DC battery bus and the APU batt direct bus (Continuously)

Question 15

Failure of one Essentil TRU?

Answer 15

ESS tie connector closes

Question 16

What will occur if we lose both Essential TRU’s

Answer 16

Cross tie closes

Question 17

If complete loss of AC power Will The essential tie close?

Answer 17

Yes… To connect the DC essential bus to the battery bus for emergency power

Question 18

If the DC service which is selected on,

Answer 18

The DC service bus is powered from the APU battery direct bus

Question 19

EMER POWER ONLYmsg?

Answer 19

Indicates the ADG has deployed

Question 20

AC service bus is normally powered from AC bus two.. On the ground?

Answer 20

Powered from the APU or external power

Question 21

If power is restored by pressing thePWR XFR OVERRIDE button..what happens?

Answer 21

Restored IDG willpower AC bus one and two However the ADG will continue to power The critical flight controls and the ADG bus

Question 22

DC power is supplied by

Answer 22

4 TRU’s and two batteries

Question 23

What’s feeds the DC emergency bus

Answer 23

Both the battery bus and the APU battery direct bus

Question 24

Which is on the emergency bus

Answer 24

Hydraulic SOV Engine fuel SOv APU fuel SOV Firex

Question 25

Power for starting the APU is provided by

Answer 25

APU battery

Question 34

How many AC buses

Answer 34

4

Question 35

How many DC buses

Answer 35

9

Question 36

The APU. Generator is driven?

Answer 36

Directly by the APU gearbox (At a constant speed) (W/its own GCU)

Question 37

Failure of an IDG Will automatically transfer the load from the failed IDG to the remaining operative IDG For any reason other than?

Answer 37

A fault on its associated

Question 38

Max TRU load in flight

Answer 38

120 Amps

Question 39

Maximum time with DC power only for CRT displays

Answer 39

Five minutes

Question 40

What is the constant speed drive depicted as on the synoptic page?

Answer 40

IDG

Question 41

Can the AC ESS bus transfer happen both automatically and manually?

Answer 41

Yes

Question 42

What does the AC service bus provide power for

Answer 42

Passenger cabin and lavatory cleaning

Question 43

When does the DC utility bus shed?

Answer 43

When the main Tie closes

Question 44

ADG Will continue to operate and supply power until

Answer 44

135 kts

Question 45

Where are thTRUs located?

Answer 45

In the nose.

Question 46

On EMER PWR you will have electrical power for approximately

Answer 46

30 minutes

Question 47

The voltages of the AC and DC electrical systems are

Answer 47

115V and 28V

Question 48

The constant speed drive in the IDG is cooled by,

Answer 48

An air/oil heat exchanger Using N1 fan air

Question 49

What are the 4 AC buses

Answer 49

AC bus 1 AC bus 2 AC essential bus AC service bus

Question 50

Bus protection is provided by the?

Answer 50

ACPC, GCU and other electrical relays