ELECTRIC

Question 1

System description

Answer 1

• 3 phase 115/200v, 400hz AC and 28v DC
• 3 AC generators, 2 engine driven and 1 APU driven
• transformer rectifiers for DC
• Emergency Generator hydraulically driven by the RAT, provides 115/200v, 400hz AC power but only at 5 KVA

Question 2

minimum battery voltage

Answer 2

• 25.6 volts
• 25.5 volts or less requires a 20 minute charge

Question 3

BUS TIE in AUTO

Answer 3

Allows any single generator or EXT PWR to run the entire system

Question 4

electrical priority logic

Answer 4

“GEAR B”

G enerators

E XT PWR

A PU

R AT

B atteries

Question 5

circuit breaker colors

Answer 5

Green - monitored

Black - not monitored

Red Collar - prevents flight crew from pulling

Question 6

GALLEY pb FAULT light

Answer 6

at least one generator load is above 100% rated output

Question 7

BAT pb FAULT light

Answer 7

battery charging current outside limits
BAT contactor opens

Question 8

buses powered by the EMER GEN

Answer 8

• AC ESS and AC ESS SHED
• DC ESS and DC ESS SHED

Question 9

normal power source of the DC BAT BUS

Answer 9

DC BUS 1 through the DC tie contactor

Question 10

When are the batteries connected to the battery bus?

Answer 10

• APU start
• battery charging
• AC BUS 1 and 2 not powered and below 100KIAS

Question 11

RAT drop

Answer 11

• automatically with the loss of AC BUS 1 and 2
• manually by pushing MAN ON (EMER ELEC PWR panel)
• or RAT MAN ON
  (HYD panel)

Question 12

GEN 1 LINE SMOKE

Answer 12

Smoke has been detected in the avionics ventilation ducting.

Expect ECAM warning(s) and EXTRACT and BLOWER FAULT lights

Question 13

GEN 1 LINE pb OFF

Answer 13

• GEN 1 line contactor opens
• AC BUS 1 powered by GEN 2 via BUS TIE
• GEN 1 still powers one fuel pump directly in each wing tank

Question 14

AC ESS BUSS FEED

Answer 14

AC ESS BUS is normally powered by AC BUS 1 and automatically switches to AC BUS 2 with
the loss of AC BUS 1

ALTN comes on when manually selected. Manual selection switches power source to
AC BUS 2.

FAULT indicates that AC ESS is not powered

Question 15

IDG fault light

Answer 15

“HOTLOP”

H igh

O il

T emperature

L ow

O il

P ressure

Question 16

RAT & EMER GEN red FAULT light

Answer 16

• loss of AC BUS 1 & AC BUS 2 and the emergency generator is not supplying electrical power
• normal for about 8 seconds when the RAT is deployed

Question 17

If the ECAM directs a pilot to select GEN 1 LINE off, what will that do?

Answer 17

GEN 1 line contactor opens (white OFF light will light)

AC BUS 1 will be powered by GEN 2 via the bus tie contactors

GEN 1 will however still power one fuel pump directly in each wing tank

Question 18

What flight deck lighting is available if normal electrical power is lost?

Answer 18

• Captain’s instrument panel
• Right dome light (provided the switch is set to DIM or BRT)
• Standby Compass