Electrical

Question 1

The Electrical System generates and distributes both

Answer 1

AC and DC power to airplane systems.

Question 2

The AC system is composed of:

Answer 2

– Two integrated drive generators (IDGs). – One auxiliary power unit (APU) generator. – One inverter. – One ram air turbine (RAT). – One AC external power unit.

Question 3

The DC system is composed of:

Answer 3

– Two NiCd batteries. – Three transformer rectifier units (TRU)s. – One DC external power input.

Question 4

The batteries charges constantly by any

Answer 4

AC source through the TRUs, including the AC GPU and the RAT.
AOM II 14-05-15

Question 5

In ARM mode (cockpit switch), the emergency lights are activated automatically

Answer 5

when the airplane loses its normal electrical power.

AOM II 14-01-40

Question 6

Whenever AC power sources are not powering AC buses, the RAT is automatically deployed, and after 8 s,

Answer 6

supplies power to the AC ESS BUS.

AOM II 14-05-10

Question 7

When BATTERY 1 SELECTOR KNOB is ON

Answer 7

the battery is connected to the DC ESS BUS 1.

AOM II 14-05-05

Question 8

When BATTERY 2 SELECTOR KNOB is AUTO

Answer 8

It allows automatic operation of the electrical system.

AOM II 14-05-05

Question 9

STBY AC BUS is normally supplied by

Answer 9

AC ESS BUS. In case of non-normal situation, it is supplied by INVERTER.
AOM II 14-05-40

Question 10

If APU is available, APU Generator is connected to

Answer 10

AC BUS TIE

AOM II 14-05-05

Question 11

The internal emergency lights are powered by six dedicated Emergency Lights Power Units (ELPU) with internal batteries connected to the

Answer 11

DC BUS 1.

AOM II 14-01-40

Question 12

The charge of the batteries (ELPU) is sufficient to supply all emergency lights for approximately

Answer 12

10 minutes.

AOM II 14-01-40

Question 13

_____ Integrated Control Centers (ICCs) and ____ Secondary Power Distribution Assemblies (SPDAs) provide distribution and control of the electrical power, and interface with other systems.

Answer 13

4 / 2

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Question 14

The source priority order for powering the airplane is:

Answer 14

– Respective IDG. – APU generator. – GPU (on ground without APU). – Opposite IDG.
AOM II 14-05-40

Question 15

Whenever the battery temperature reaches 70°C for at least 2 s,

Answer 15

the associated indication becomes red and the EICAS WARNING message BATT 1 (2) OVERTEMP is triggered.
AOM II 14-05-15

Question 16

Some thermal CBs are located on the cockpit sidewall panels and others inside the in ____the electronics bays.

The electronic CBs are located inside the ______ , in the electronics bays.

Answer 16

ICCs / SPDAs

AOM II 14-05-30

Question 17

The NBPT allows the momentary paralleling between two AC power sources:

Answer 17

the IDGs, GPU and the APU generator, at any possible combination.
AOM II 14-05-10