Electrical Systems Flashcards Preview

EAWS > Electrical Systems > Flashcards

Flashcards in Electrical Systems Deck (30):
1

Current

I
Movement of electrons from positive to negative

2

Voltage

E
Difference of potential of two charges

3

Resistance

R
Opposition to current
Measured in Ohms

4

Hertz

Hz
Measurement of cycles in a given period of time
Frequency

5

Ohm's Law

I=E/R
Current is directly proportional to voltage and inversely proportional to resistance.

6

Alternating current

Constantly changes amplitude
Reversed direction at regular intervals

7

Direct current

Flows in one direction

8

How many generators are there?

3
One for each accessory mod and one for the APU

9

What does each generator provide?

115/200 volts A/C
3 phases
400 Hz

10

How many GCUs are there and what do they do?

3
Regulate generator output and provide over and under voltage protection and also frequency protection
Fault protection

11

What does the number one generator control?
Alternating current

No. 1 AC Primary Bus
AC Essential Bus
AC Secondary Bus
Controls No. 2 Primary Bus and AC Monitor Bus
APU Generator controls Auxiliary Power

12

What does the battery provide power for?

DC Essential Bus
APU starting

13

What is a circuit breaker?

A means to protect circuits from an over current condition
They are resettable

14

What do the No. 1 and No. 2 primary AC Bus Breakers supply?

Armament
Heating
Lighting
Engine
Instrument
Radio loads

15

What does the AC Monitor Bus breaker supply?

Main rotor blade deice

16

What does the AC Secondary Bus supply?

Windshield anti ice and tail rotor blade deice

17

What do the No. 1 and No. 2 Primary Bus supply power to?

Overhead console circuit breaker panels

18

What do the battery bus and battery utility bus provide power to?

Lower console circuit breaker panel

19

What does the battery conditioner/analyzer do?

Monitors battery voltage and temp
Contains circuit for battery charging

20

How many AC to DC transformers/rectifiers power converters are there?

2

21

DAFCS

Digital
Automatic
Flight
Control
System

22

Compass

Two displacement gyroscopes
Each has a vertical and directional gyro
Synchro outputs representing heading, roll, pitch, and roll synchro signals to the TDP and AFCS for distribution to equipment

23

Attitude Indicator

Displays aircraft attitude or artificial horizon

24

Barometric Altimeter

Aircraft position above sea level

25

Vertical Speed Indicator

Vertical speed

26

Airspeed Indicator

Difference between impact pressure and static pressure

27

Position lights

White light on tail rotor pylon
Red and green lights near main landing gears

28

Anti collision lights

Red and white light under tail

29

Where is the battery and what is its purpose?

Under co-pilot seat
24 volts DC ni-cad battery
Primary source of power to start APU

30

Warnings to observe before applying power

Clear the stab
WOW closed
All switches off,safe, or normal
Power cord not energized when inserting extracting
All circuit breakers secured