Electrical

Question 1

AC / DC Sources

Answer 1

APU
2 Engine Generators
External AC Power
---------
3 TRUs
1 (or 2) Battery

Question 2

AC Power Operating Principles

Answer 2

No paralleling of AC Sources

Connecting a new power source automatically disconnects previous source.

Question 3

EXT POWER AVAIL light indicates

Answer 3

External Power is available and of good quality

Question 4

DRIVE

Answer 4

Low Oil Pressure
------------------------
May be a result of 
- Auto shutdown due to High Oil Temp
- Engine Off
- Manually disconnected
- IDG Failure

Question 5

Is it possible to use APU and EXT power at the same time?

Answer 5

No

Question 6

SOURCE OFF

Answer 6

No source has been manually selected - or -

the manually selected source has been disconnected

Question 7

If the aircraft takes off with the APU powering both Transfer Busses:

Answer 7

Logic allows the Engine Generators to automatically power the Transfer Busses

Question 8

TR UNIT

Answer 8

On Ground: TRU 1, 2, or 3 has failed

In Flight: TRU 1, or TRU 2 and 3 has failed

Question 9

DC Cross Bus Tie Relay opens when:

Answer 9

GS Intercept - or -

BUS Transfer Switch - OFF

Question 10

Battery only power duration, busses powered:

Answer 10

30 minutes (1 Battery)
60 minutes (2 Battery)

Hot Batt, Switched Hot Batt, Battery, DC Standby, AC Standby (through static inverter)

Question 11

What would cause the IDG to automatically disconnect?

Answer 11

High IDG oil temp

Question 12

GEN OFF BUS

Answer 12

IDG not supplying power to the related bus

Question 13

ELEC

Answer 13

A fault exists in the DC or STANDBY power system

Question 14

STANDBY POWER OFF

Answer 14

AC STANDBY, DC STANDBY, BATTERY Bus not powered.