Electrical Systems Flashcards
Current
I
Movement of electrons from positive to negative
Voltage
E
Difference of potential of two charges
Resistance
R
Opposition to current
Measured in Ohms
Hertz
Hz
Measurement of cycles in a given period of time
Frequency
Ohm’s Law
I=E/R
Current is directly proportional to voltage and inversely proportional to resistance.
Alternating current
Constantly changes amplitude
Reversed direction at regular intervals
Direct current
Flows in one direction
How many generators are there?
3
One for each accessory mod and one for the APU
What does each generator provide?
115/200 volts A/C
3 phases
400 Hz
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
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
What does the battery provide power for?
DC Essential Bus
APU starting
What is a circuit breaker?
A means to protect circuits from an over current condition
They are resettable
What do the No. 1 and No. 2 primary AC Bus Breakers supply?
Armament Heating Lighting Engine Instrument Radio loads
What does the AC Monitor Bus breaker supply?
Main rotor blade deice
What does the AC Secondary Bus supply?
Windshield anti ice and tail rotor blade deice
What do the No. 1 and No. 2 Primary Bus supply power to?
Overhead console circuit breaker panels
What do the battery bus and battery utility bus provide power to?
Lower console circuit breaker panel
What does the battery conditioner/analyzer do?
Monitors battery voltage and temp
Contains circuit for battery charging
How many AC to DC transformers/rectifiers power converters are there?
2
DAFCS
Digital Automatic Flight Control System
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
Attitude Indicator
Displays aircraft attitude or artificial horizon
Barometric Altimeter
Aircraft position above sea level
Vertical Speed Indicator
Vertical speed
Airspeed Indicator
Difference between impact pressure and static pressure
Position lights
White light on tail rotor pylon
Red and green lights near main landing gears
Anti collision lights
Red and white light under tail
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
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
