ATA Chapter 24

Question 1

There are two identical engine driven generators called

Answer 1

Integrated Drive
Generators

Question 2

They are used as the main power source to supply
the A/C electrical network

Answer 2

Integrated Drive
Generators (IDGs)

Question 3

Each AC bus supplies a Transformer Rectifier (TR):

Answer 3

• AC bus 1 supplies TR 1,
• AC bus 2 supplies TR 2.

Question 4

The DC battery bus can charge the batteries or receive power from the
batteries as a backup supply, if

Answer 4

no other power sources are available

Question 5

The electrical system has an ESS TR, which supplies the DC ESS
Bus in abnormal or emergency configuration.
In abnormal configuration (loss of TR1 or TR2) the

Answer 5

ESS TR is
supplied by the AC ESS Bus.

Question 6

A TR is

Answer 6

a Transformer Rectifier

Question 7

IDG stands for

Answer 7

Integrated Drive
Generators

Question 8

ESS Stands for

Answer 8

Essential

Question 9

ESS TR Stands For

Answer 9

Essential Transformer Rectifier

Question 10

CSD Stands For

Answer 10

Constant Speed Drive

Question 11

ABNORMAL CONFIGURATION
The electrical system has an ESS TR, which supplies the DC ESS
Bus in abnormal or emergency configuration.
In abnormal configuration (loss of TR1 or TR2) the ESS TR is
supplied by the

Answer 11

AC ESS Bus.

Question 12

EMERGENCY CONFIGURATION
In the event of emergency operation, the __________________ supplies the A/C with electrical power

Answer 12

Emergency Generator (EMER
GEN)

Question 13

The EMER GEN needs ________
to operate.

Answer 13

hydraulic power

Question 14

BATTERY ONLY CONFIGURATION
In emergency configuration with emergency generator not available

BAT 1 supplies the

Answer 14

AC ESS BUS via the static inverter

Question 15

BATTERY ONLY CONFIGURATION
In emergency configuration with emergency generator not available

BAT 2 supplies the

Answer 15

DC ESS BUS