Electrical

Question 1

What supplies AC power is available to the a/c?

Answer 1

Two IDGs, APU generator, external power

Question 2

What happens when external power is selected on?

Answer 2

It disconnects all Engine and APU power from buses and uses external power

Question 3

What components make up an IDG?

Answer 3

Generator and CSD or Constant Speed Drive

Question 4

DRIVE light illuminates under what conditions?

Answer 4

High IDG oil temp or Low IDG oil pressure

Question 5

Whats the priority of the IDG for each engine?

Answer 5

It has the highest priority over any other power source

Question 6

What does the L and R Gen Cont switch move?

Answer 6

Connects or disconnects the Gen Cont switch breaker

Question 7

Does the APU generator has a CSD?

Answer 7

No, relatively constant speed

Question 8

When does the APU Gen Off message illuminate?

Answer 8

The APU is operating, and the apu generator control breaker is open beacuse of a fault or the apu gen switched is selected off

Question 9

Ground handling bus can only be powered by what sources of power?

Answer 9

External or Apu power

Question 10

What are the indications that galley buses have shed?

Answer 10

No indication

Question 11

What is the bus tie system function?

Answer 11

Provide power to both main ac and dc busses and isolate faults.

Question 12

What is the load shedding sequence?

Answer 12

Galley busses, utility busses and inidividual equipent items powered by the main ac busses.

Question 13

When is the utility bus off light illuminated, along with the utility and galley bus are un-powered?

Answer 13

Both thrust levers are advanced on the ground with a single power source. Electrical overload. Single Generator Operations in-flight. Engine Start with apu providing electrical power.

Question 14

What pump can be shed if APU or external power is the only power source?

Answer 14

C ELEC HYD 2

Question 15

What is the shed sequence during start?

Answer 15

Left engine start - L/R utility and galley buses shed. Right engine start- only R utility and galley bus shed.

Question 16

How long does the battery power the a/c?

Answer 16

30 min

Question 17

When is the hot batt bus powered?

Answer 17

All the time, even if batt is in off position.

Question 18

What is powered when batt is on and in standby power?

Answer 18

batt bus, standby busses

Question 19

Describe the STBY Power selector?

Answer 19

Off - standby busses are not powered. Auto- provides automatic stby bus transfer to battery power if AC power is lost. Bat- standby busses are powered from the main battery . Off annunciation - either the AC or DC standby bus is not powered

Question 20

What bus are the flight instruments powered by?

Answer 20

L and R main AC busses respectively.

Question 21

-300 how much standby power do you get if loss of power?

Answer 21

90 min, main batt and apu batt are paralleled.

Question 22

-300 the HDG or Hydraulic Driven Generator activates automatically when…

Answer 22

The L and R main AC busses are unpowered

Question 23

How long is standby power available on 767-300

Answer 23

30 min, and if battery power is depleted the flaps and gear cannot be extended

Question 24

767ER when does the HDG activate?

Answer 24

When the L and R main AC busses are unpowered. its driven by the center hydraulic system

Question 25

What does the FLT INSTR BUS PWR switch do?

Answer 25

It allows the HDG to power the CA flight instruments when its off and allows the HDG to power the FO flight instruments when its selected on (ALT).