Electrical

Question 1

What is the purpose of the AH-64D Electrical System?

Answer 1

Generate, convert, regulate, distribute, control, monitor, and protect electrical power throughout the aircraft.

Question 2

Which system distributes unswitched power to electrical loads controllers requiring greater than 20 Amps AC or 25 Amps DC?

Answer 2

Primary Power System

Question 3

The two HPSMs and the MSTR IGN key switch are part of the _____ power system.

Answer 3

primary

Question 4

Which system receives unswitched power from the HPSMs and distributes electrical power to load controllers requiring less than or equal to 20 Amps AC or 25 Amps DC?

Answer 4

secondary

Question 5

Two CBPs and two ELCs are part of the _____ power system.

Answer 5

secondary

Question 6

What does the Electrical Power Management System (EPMS) provide?

Answer 6

Circuit Protection
Automatic Bus Tie
Distribution of all Primary and Secondary power

Question 7

What components make up the EPMS?

Answer 7

Two HPSMs
Two CBPs <> MSTR IGN switch
Two ELCs <> Utility Relay Panel

Question 8

What do the two High Power Switching Modules (HPSM) provide?

Answer 8

Power Distribution
Over Current Sensing
Contractor switching logic for all AC, DC, and BATT power requirements

Question 9

_____ provides unswitched power to ELC1, CBP1, ECS1, and FCR Line Replaceable Units (LRUs).

Answer 9

HPSM1

Question 10

_____ provides unswitched power to ELC2, CBP2, ECS2, and Battery Charger control logic.

Answer 10

HPSM2

Question 11

The Circuit Breaker Panels (CBPs) are ______ and provide hard wired, unswitched circuit protection to meet demands for ________.

Answer 11

non-redundant

AC, DC, and Battery Secondary power requirements

Question 12

Where do the CBPs receive power from?

Answer 12

HPSM

Question 13

What component receives directly from the HPSM and routes power to the using component or system?

Answer 13

ELCs

Question 14

What are the five Electrical Subsystems?

Answer 14

(1) Electrical Power Management System (EPMS)
(2) Battery Subsystem
(3) Alternating Current (AC) Electrical Subsystem
(4) Direct Current (DC) Electrical Subsystem
(5) External Ground Power Subsystem

Question 15

MSTR IGN switch, ELC 1 & 2, CBP 1 & 2, HPSM 1 & 2, and Utility Relay Panel are all components of what subsystem?

Answer 15

Electrical Power Management System

Question 16

The Battery and Battery Charger are major components of what subsystem?

Answer 16

Battery Subsystem

Question 17

AC GEN 1 & 2 and Generator Control Unit (GCU) 1 & 2 are major components of what subsystem?

Answer 17

AC Electrical Subsystem

Question 18

The two Transformer Rectifier Units (TRU 1 & 2) are major components of what subsystem?

Answer 18

DC Electrical Subsystem

Question 19

The External Power Receptacle, External Power Monitor, and External Power Sense Switch are all major components of what subsystem?

Answer 19

External Ground Power Subsystem

Question 20

Which distribution system distributes unswitched power to electrical load controllers requiring greater than 20 Amps AC or 25 Amps DC?

Answer 20

Primary Power Distribution System

Question 21

Which distribution system includes two HPSMs and MSTR IGN key switch?

Answer 21

Primary Power Distribution System

Question 22

Which distribution system receives unswitched power from the HPSMs and distributes electrical power to load controllers requiring less than or equal to 20 Amps AC or 25 Amps DC?

Answer 22

Secondary Power Distribution System

Question 23

Which distribution system includes two CBPs and two ELCs?

Answer 23

Secondary Power Distribution System

Question 24

What is the purpose of the Electrical Power Management System (EPMS)?

Answer 24

Distribution of Primary and Secondary electrical power as required for operation of the helicopter

Question 25

From what three sources can the EPMS receive electrical power?

Answer 25

AGPU TRUs Aircraft Battery

Question 26

What three things does the EPMS provide?

Answer 26

Circuit Protection Automatic Bus Tie Distribution of all PRI and SEC power

Question 27

What five components make up the Electrical Power Management System?

Answer 27

2 HPSMs, 2 CBPs, 2 ELCs, UTIL Relay Panel, MSTR IGN switch

Question 28

The _____ provide power distribution, over current sensing, and contactor switching logic for all AC, DC, and BATT power requirements.

Answer 28

two HPSMs

Question 29

The ______ consists of AC and DC/BATT high power modules, control modules, connectors, provisions for mounting the CBPs, and EXT wire terminals and bus tie connections located on the XMSN side of both ___.

Answer 29

HPSMs | HPSMs

Question 30

HPSM1 provides unswitched power to ___________.

Answer 30

ELC1, CBP1, ECS1, and FCR LRUs

Question 31

HPSM2 provides unswitched power to ____________.

Answer 31

ELC2, CBP2, ECS2, and BATT charger control logic

Question 32

___ are non-redundant, two per aircraft, and provide hard wired, unswitched circuit protection to meet system demands for AC, DC, and BATT secondary power requirements.

Answer 32

CBPs

Question 33

CBPs receive power directly from the ______ and route the required power through circuit breakers to the ________.

Answer 33

HPSM buses | using component or system

Question 34

The _____ provides unswitched secondary power distribution to other systems or components located mainly on the left side of the airframe.

Answer 34

Circuit Breaker Panel 1 (CBP1)