System Oral

Question 1

How long does the DVDR record audio and flight data?

How many units are there?

Answer 1

120 minutes of audio
25 hours of flight data
2 units, one FWD and one AFT

Question 2

Why is the battery 2 switch only OFF/AUTO?

Answer 2

When the APU is started the battery is isolated to the APU start bus

Question 3

What are some important things on the battery hot busses?

Answer 3

Hot bus 1: engine 1A/2A fire bottle
Engine 1 hydraulic and fuel SOV
Engine 1 oil level indication
Courtesy/ ceiling lights
DC ceiling lights

Hot bus 2:
Engine 1B/2B fire bottle
Engine 2 hydraulic and fuel SOV
Engine 2 oil level indication
CMC
Panel refuel
Water and waste system

Question 4

What is powered with only the batteries on?

Answer 4

Displays 2/3, IESS, #1 CCD, #2 MCDU, #2 radio, clock, whisky compass light

Question 5

What does the ground power AVAIL light mean?

Answer 5

GPU power is connected, available, and correct

Question 6

If an AC GPU is connected and in use will we get full AC/DC power?

Answer 6

Yes

Question 7

How many volts are required for APU start?

What is the minimum battery temp for APU start?

Answer 7

22. 5 VDC

- 20 C battery 2

Question 8

How can the APU be started with a low battery?

Answer 8

DC GPU

Question 9

What is the only time battery voltage can be checked?

Answer 9

Batts on before starting anything or connecting GPU

Question 10

After APU start when does it start to provide electrical power?

Answer 10

95%+3 seconds

If GPU was connected, it goes back to avail

Question 11

How much power does the IDG generate?

What about the APU generator?

Answer 11

115VAC, 40KVA for both

Question 12

What does an amber light by the APU disconnect switch mean?

Answer 12

High oil temp and/or low oil pressure

Question 13

Besides the disconnect switch, are there any other ways for the IDG to be disconnected?

Answer 13

The CSD input shaft has a shear section

Question 14

Can one IDG support the entire electrical system?

Answer 14

Sure can

Question 15

What will power AC bus 2 if the #2 IDG craps out and the APU happens to be running?

Answer 15

APU

Question 16

When might we select the AC bus ties to open?

Answer 16

Short circuit

Question 17

What happens if both IDGs die?

Answer 17

The RAT deploys

Question 18

What electrical system does the RAT power?

Does it power any hydraulic systems?

Answer 18

It will power the AC essential bus and the hydraulic system 3A

Question 19

With only the RAT for electrical power, will the slats and flaps work?

Answer 19

Yes, however they will only function at half speed

Question 20

What should we do after the RAT deploys?

Answer 20

Probably start the APU for more electrical power and start looking for a place to land

Question 21

If you are flying at FL330 can you start the APU?

Answer 21

No, you must descend to FL300

Question 22

What is the max altitude for APU bleed for packs and engine start?

Answer 22

FL150 and FL210

Question 23

What the the TRUs do?

Answer 23

Convert 115VAC to 28VDC at 300 amps

Question 24

When the RAT deploys what happens?

Answer 24

Batteries power the systems through the inverters for the 8 seconds it takes for it to deploy and spin up, then you get AC power to the essential bus and DC essential power through the ESS TRU

Question 25

Is the dome light connected to the hot battery bus?

Answer 25

Yes, but it only works if the flight attendant courtesy light button is pressed

Question 26

How is the fire test accomplished?

Answer 26

Press the test button for at least three seconds and both fire handles, both cargo fire lights, both APU fire lights, EICAS messages for all of the above, both master warning lights, and both ITT Gauges give fire messages

Question 27

What are the memory items for engine fire?

Answer 27

Auto throttles off, associated throttle to idle, start/ stop selector to stop, pull fire handle, land at nearest appropriate airport, QRH

Question 28

Memory items for APU fire

Answer 28

APU emergency stop button- push in

QRH

Question 29

How is the DVDR test accomplished?

Answer 29

Push button, wait for lights to finish