Electrical

Question 0

Five (5) sources of AC power:

Answer 0

+ Two (2) engines
+ APU generator
+ External power
+ Hydraulic Driven Generator (HDG)

Question 1

Main battery and Standby system powers:

Answer 1

+ Hot Battery Bus
+ Battery Bus
+ Standby AC Bus + Standby DC Bus

Question 2

DC Fuel Pump only operates when no AC power available.

Answer 2

(Automatic with no pilot control.)

Question 3

When AC power is available, Left FWD AC fuel pump supplies APU.

Answer 3

(Automatic regardless of switch position.)

Question 4

APU fuel supplied

Answer 4

From left manifold

Question 5

APU BATT:

Answer 5

+ Starter
+ Air inlet door
+ APU control circuits

Question 6

AC BATT:

Answer 6

+ Fire protection
+ APU fuel valve
+ DC fuel pump

Question 7

In Flight, the main BATT Switch will not affect APU operation.

Answer 7

(Turning off main battery will not shut down APU)

Question 8

APU RUN Light illuminates approximately

Answer 8

95%

Question 9

APU Start indications:

Answer 9

+ FAULT Light flashes once

+ RUN Light flashes twice

Question 10

APU GEN OFF Light illuminated with APU running,

Answer 10

APU generator control breaker open due to faults

Question 11

APU starter duty cycle,

Answer 11

three (3) consecutive attempts within a 60 minute period.

Question 12

APU shutdown cooling

Answer 12

normally approximately 60 seconds. (May vary between zero (0) to 120 seconds.)

Question 13

APU Selector is accidently moved to OFF with RUN Light illuminated,

Answer 13

moving Selector momentarily to START then back to RUN cancels shutdown.

Question 14

APU FAULT Light illuminated

Answer 14

APU will shut down

Question 15

APU fire warning

Answer 15

APU will shut down

Question 16

APU fire detection

Answer 16

On BATT BUS

Question 17

APU fire protection

Answer 17

On batt bus

Question 18

Ground Service Bus powers:

Answer 18

Battery charger(s) (one or two)
+ Equipment cooling fan
+ Left FWD Fuel pump

Question 19

Load shedding during normal operations:

Answer 19

+One (1) electric hydraulic pump prior to engine start
+ Both center tank fuel pumps prior to engine start + Both utility busses during engine start (galley power) (When second engine is started only respective utility bus sheds)

Question 20

Load shedding in flight after engine failure:

Answer 20

\+ Utility busses (galley power) 
\+ Respective center tank fuel pump 
\+ All cabin indirect ceiling lights 
\+ FWD direct ceiling lights 
\+ C2 hydraulic pump

Question 21

The Hydraulic Driven Generator (HDG) activates automatically

Answer 21

when both L and R Main AC Busses are unpowered.

Question 22

The Hydraulic Driven Generator (HDG) provides power

Answer 22

\+ Left AC XFR Bus 
\+ Right AC XFR Bus 
\+ Standby AC Bus (through L AC XFR Bus) 
\+ Captain’s FLT INSTR XFR Bus 
\+ Hot Battery Bus 
\+ Battery Bus 
\+ Standby DC Bus

Question 23

GEN DRIVE Light illuminated:

Answer 23

+ High oil temperature + Low oil pressure

Question 24

STDBY BUS OFF Light illuminated,

Answer 24

power is lost to one or both Standby Busses.

Question 25

Ram Air Turbine (RAT) Switch must be pushed to deploy.

Answer 25

Deploys automatically: + >80 or 85 knots

+ Both engines < 50%