Block Iv - Electrical Systems (Specific)

Front 1

A. Safety (Ref a, b)
Avoid contact with energized electrical circuits. Pull and Tag-Out circuit breakers on equipment being repaired. If it is not unsafe to do so, work with only one hand, keeping the other hand at your side, away from all conductive
material.

Back 1

This precaution reduces the likelihood of accidents that result in current passing through the chest cavity. If an individual comes in contact with a live electrical conductor, do not touch the equipment, cord or person.
Disconnect the power source from the circuit breaker or pullout the plug using a belt.

Front 2

B. Electrical Theory Basics (Ref a, b)
Voltage is the electrical force which causes current to flow in a circuit. Voltage is measured in volts (v).
Electrical current is the movement

Back 2

of electrical charge through the
electronic circuit. Current is measured in amperes (AMPS, A).

Front 3

Resistance causes an opposition to the flow

Back 3

of electricity in a circuit.
Resistance controls the amount of voltage and/or amperage in a circuit.
Resistance is measured in ohms (Q

Front 4

Hertz is an electrical unit of frequency equal to

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one cycle per second.
Cycles per second are measured in hertz (Hz).

Front 5

An electrical Bus is a

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distribution point in an aircraft electrical system
to which the battery and the generator(s) are connected. Components derive their
power from a Bus.

Front 6

c. Generators (Ref a, b)
An air cooled, engine-driven, AC generator, rated

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40 KVA at 200/115 volts,
is mounted on the engine accessory drive pad of each engine.

Front 7

D. Batteries (Ref a, b)
The battery system provides a means of operating certain essential DC
equipment when external power or power from the transformer-rectifier system is
not available.

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A 24 volt battery is installed in a recessed compartment on the lower left side of the nose section.

Front 8

E. Distribution (Ref a, b) The four main distribution buses are:

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essential, main, left hand, and right hand AC buses.

Front 9

On aircraft 165313 and up there is also an essential and main avionics bus. AC power distribution is controlled by

Back 9

contactor relays so that
the essential aircraft systems are powered at all times. With one engine driven generator the essential and main AC buses will be powered. With two generators
all AC buses will be powered.

Front 10

F. Circuit Protection (Ref a, b)
Circuit protection is provided by

Back 10

circuit breakers, fuses and current limiters.

Front 11

The main location is in the flight station on the pilots and co-pilots circuit breaker panels. There is also circuit protection

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on the upper main
distribution panel, located on the forward side of the 245 bulkhead, and the aft
junction box located in the cargo compartment.

Front 12

G. Regulation (Ref a, b)
AC power is regulated through the use of

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five voltage regulators. One for
each AC generator provides automatic regulation of generator output voltage.

Front 13

On aircraft 165313 and up power is regulated through

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generator control units. The
units are mounted on the electrical control and supply rack.

Front 14

References:
(a) NAVAIR 01-75GAH-2-8, MAINTENANCE INSTRUCTIONS (ORGANIZATIONAL) RADIO-
~ COMMUNICATION AND NAVIGATION SYSTEMS NAVY MODELC-130T, KC-130T AND KC-130T-30
AIRCRAFT
A. Safety (Ref a)
Avionics safety not only includes basic electrical safety but also has
specific hazards associated this operation of certain systems.

Back 14

The APS-133 weather radar has a hazard area that extends 35 feet in front of
the aircraft for personnel and 51 feet for explosives or fuel.
The ARC-190 HF radios hazard area is the top of the aircraft for personnel,
200 for fuel ignition and 150 feet for explosives.

Front 15

B. Avionics (Ref a)
Electronic systems are provided in the aircraft for

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communication and navigation

Front 16

Major components are located in equipment racks mounted at various stations in the

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fuselage.

Front 17

Antennas are mounted flush with the fuselage skin
where possible

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in order to eliminate additional aerodynamic drag.

Front 18

c. Instrumentation and Displays (Ref a)
Instruments and indicators of instrument systems are grouped according to function or panels

Back 18

in the flight station

Front 19

The main instrument panel is divided into three sections. The pilot's flight indicators are

Back 19

on the left section.

Front 20

The right section, called the copilot's instrument panel, holds the copilot's

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flight indicators and hydraulic system pressure indicators.

Front 21

Engine indicators are on the

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center panel.

Front 22

Electrical system indicators, fuel quantity indicators, and
anti-icing and de-icing indicators are on the

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overhead control panel.

Front 23

There are two Attitude Display Indicators (ADI),

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one each located on the
pilot and copilot main instrument panel centered just below the windscreen.

Front 24

The ADI gives input to the pilot and copilot on the

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relative attitude of the aircraft.

Front 25

There are two Horizontal Situation Indicators (HIS),

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one each located on the
pilot and copilot main instrument panel directly below the ADI.

Front 26

The HSIs display
heading and distance inputs

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to the pilot and copilot from a wide range of navigation systems which are selectable.

Front 27

There are four Bearing Distance Heading Indicators (BDHI), one each located
on the

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pilots and copilots main instrument panel, and the other two are located
on the navigator's instrument panel.

Front 28

Two Radar indicators are utilized

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One.is located on the bottom right corner of the pilot's main instrument panel, and the other is at the navigator's
station. They are used to display weather data coming from the APS-133 radar
system.

Front 29

There are two Radar Altimeter indicators,

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one each located on the pilots and
copilots main instrument panel. They give input to the pilot and copilot on the
actual aircraft distance to ground.

Front 30

There are three Barometric Altimeter indicators

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one located on each of the
pilots and copilots main instrument panels and the third is located on the
navigator's instrument panel. The barometric altimeter indicator gives input to
the pilot and copilot on the aircraft distance above sea level.

Front 31

There are two Airspeed indicators,

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one each located on the pilots and copilots main instrument panel. The airspeed indicator gives input to the pilot
and copilot on the airspeed of the aircraft measured in knots (not to be confused
with the ground speed measured in MPH) .

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One Traffic Collision Avoidance System (TCAS)

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indicator is located on the
pilot's main instrument panel. The TCAS indicator gives input to the flight crew
on air traffic around the aircraft. It also gives instructions on how to move
the aircraft to avoid a mid air collision.

Front 33

There are three Control Display Navigational Units (CDNU) onboard the Cl03T.
One is located on the

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pilot's side of the center stand electrical panel,the second is located on the copilot's side shelf extension, and the third is located on the navigator's instrument panel. The CDNUs give the flight crew the
ability to change radio frequencies, navigational stations, and flight planning
for waypoints to be displayed on the radar indicator.

Front 34

D. Navigation Equipment (Ref a)
ARN-151 GPS (Global Positioning System) - There is one GPS system located in
the aircraft controlled by the CDNU. The GPS system is a self-contained system
that gives heading and distance information to the flight crew on any waypoint
anywhere in the world.
LTN-100 INS (Inertial Navigation System) - There are two INS systems
installed onboard the C-130. The number one system is controlled by a
controller located on the

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co-pilot side, center stand electrical panel.

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The number two system is controlled using a controller

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located on the navigator's
instrument panel

Front 36

The INS system gives the flight crew input on the

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position of the aircraft and distance and heading information to any waypoint in the world.

Front 37

C-12 Compass System - There are two C-12 compass systems installed on the C130
and both are controlled using controllers located

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on the navigator's main
instrument panel. The C-12 system gives the flight crew relevant bearing information for various indicator displays.

Front 38

Standby Compass - There is one standby compass located on the

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top left pilot's main instrument panel. The standby compass consists of an adjustable
magnet placed in a viscous fluid and it provides the flight crew with a relative
bearing of the aircraft.

Front 39

TACAN (Tactical Air Navigation) -

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There are two different TACAN systems on the C-130. One is the ARN-139 and the second is the ARN-118.

Front 40

They are both
controlled using the CDNU and both give heading and distance to a TACAN station
The main difference is that the

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ARN-118 provides the ability to become a mobile TACAN station for refueling duty.

Front 41

ARN-126 VOR (VHF Omnidirectional Ranging) -

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There are two VOR systems
installed that are controlled by the CDNU. Both give bearing and distance to a VOR station.

Front 42

DF-206 ADF (Automatic Direction Finder) -

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There are two ADF system installE
utilizing one controller that is located in the center stand electrical panel. The ADF gives bearing to a selected radio station.

Front 43

E. Communication Equipment (Ref a)
AN/AIC-18A/25 rcs - There are nine Inter-Communication Stations (rCS)
located throughout the aircraft that allow for communication between crew
members

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There are six control boxes located in the flight station for the pilot, copilot, flight engineer, flight engineer instructor, navigator station,
and the navigator bunk station. There remaining three are in the cargo
compartment.

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here are two ARC-2I0 radios installed in the aircraft and they are controlled by the CDNU.

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The ARC-210 is a duel frequency range radio that allows contact between the aircraft and medium range stations.

Front 45

ARC-186 VHF Radio

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There are two ARC-186 radios installed on the aircraft
and both are controlled through the CDNU. The ARC-186 radios are a single
frequency range radio to allow contact between the aircraft and medium range
stations.

Front 46

ARC-190 HF Radio -

Back 46

There are two ARC-190 radios installed on the aircraft.
The number one system is controlled by a control box located on the pilot side
center stand electrical panel. The number two system is controlled by a control
box located on the copilot's side shelf extension. The ARC-190 radio allows for
contact between the aircraft and long range targets.

Front 47

F. Radio Detecting and Ranging (RADAR) (Ref a)
APS-133 Radar system - There is one APS-133 radar system installed in the
aircraft and it is controlled by two separate control boxes.

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One control box is located on the pilot's side shelf extension and the other is located at the
navigator's instrument panel. The APS-133 radar set is used primarily for
weather/ground avoidance but it can also be used to display waypoint information from the GPS or LTN-IOO.