Block V - Electrical Systems

Question 1

Define Current:

Answer 1

Current (I): A directed movement of electrons in a conductor or circuit from positive to negative.

Question 2

Define Voltage:

Answer 2

Voltage (E): Measured as the difference of potential of two charges of interest.

Question 3

Define Resistance:

Answer 3

Resistance (R): The opposition to current. The Ohm is the basic unit of measurement and is represented by the Greek letter omega (Ω).

Question 4

Define Hertz:

Answer 4

Hertz (Hz): A measurement of cycles in a given period of time. Also, referred to as frequency.

Question 5

Define Ohm’s Law:

Answer 5

I=E/ R. The current (I) in a circuit is directly proportional to the voltage (E) and inversely proportional to the resistance (R). Current (I) is a directed movement of electrons in conductor or circuit from positive to negative. Voltage (E) is measured as the difference of potential of two charges of interest. Resistance (R) is the opposition to current. The ohm is the basic unit of resistance.

Question 6

Describe the 3 Generators of the H-60R

Answer 6

Mounted on the front of the #1 accessory module.
#2 Generator: Mounted on the front of the #2 accessory module. APU Generator: Mounted on the front of the APU.

Question 7

Generator Power description:

Answer 7

Each Generator provides: 115/200 Volts A/C

3 Phases, 400 Hz

Question 8

Generator Control Units (GCU):

Answer 8

3 total, one for each generator. They regulate generator output and provide over/under voltage/frequency protection.

Question 9

Define: Alternating Current

Answer 9

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

Question 10

Purpose of Circuit Breakers:

Answer 10

Circuit breakers are a means to protect circuits from an over current condition (short to ground). They are resettable.

Question 11

Circuit Breaker AC:

Answer 11

Alternating Current:
No. 1 and No. 2 primary ac bus breakers supply armament, heating, lighting, engine, instrument, and radio loads. AC essential breaker supplies flight instrument and control system loads. AC monitor bus breaker supplies main rotor blade deice AC secondary bus supplies windshield anti-ice and tail rotor blade deice.

Question 12

Circuit Breaker DC:

Answer 12

Direct Current:
No. 1 and No. 2 dc primary bus supply power to circuit breakers or circuit breaker panels DC essential bus provides power to circuit breakers on overhead console circuit breaker panels. Battery bus and battery utility bus provide power to circuit breakers on the lower console circuit breaker panel.

Question 13

AC Regulation:

Answer 13

Alternating Current:
Generator Control Unit monitors and regulates each generator output. It provides over and under voltage protection feeder fault protection and under frequency protection.

Question 14

DC Regulation:

Answer 14

Direct Current:
Battery Conditioner/Analyzer continuously monitors battery voltage and temperature and contains a circuit for battery charging. The dc power system consists of two ac-to-dc transformers/rectifier power converters.

Question 15

What is DAFCS?

Answer 15

Digital Automatic Flight Control System

Question 16

Purpose of Compass?

Answer 16

There are two displacement gyroscopes. Each gyroscope consists of a vertical and a directional gyro, mounted in multiple gimbals. Synchro outputs representing heading, roll, and pitch, and roll synchro signals to the TDP and to AFCS for distribution to the various equipment.

Question 17

What’s Attitude Indicator?

Answer 17

Attitude Indicator (AI): Provides displays aircraft attitude also known as artificial horizon.

Question 18

Barometric Altimeters?

Answer 18

Barometric altimeter: Reads aircraft position above sea level.

Question 19

Vertical Speed Indicators (VSI) ?

Answer 19

Vertical Speed Indicator (VSI): Indicates vertical speed.

Question 20

Airspeed Indicator?

Answer 20

Airspeed Indicator (AI): Measures difference between impact pressure and static pressure.

Question 21

Position Lights:

Answer 21

White light located tail rotor pylon/ red light on the left and green on right main landing gear sponsons or stub wings.

Question 22

Anti-Collision Lights:

Answer 22

Anti-collision lights: On top of the tail underside of tail cone clear lens for day and red lens for night.

Question 23

Batteries:

Answer 23

The battery is located under the co-pilots seat. The purpose - 24volts-dc ni-cad battery provides primary source of power to start APU.