CH-47D Electrical System
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CH-47D Electrical System. ACTION: Analyze electrical system malfunctions and prescribe corrective actions. CONDITION: While serving as a Maintenance Test Pilot (MTP) or Flight Engineer. STANDARD: In Accordance With (IAW)

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ACTION: Analyze electrical system malfunctions and prescribe corrective actions.

CONDITION: While serving as a Maintenance

Test Pilot (MTP) or Flight Engineer.

STANDARD: In Accordance With (IAW)

TM 55-1520-240-Series.

CH-47D Electrical System

Terminal Learning Objective


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Safety Requirements: None.

Risk Assessment Level: Low.

Environmental Considerations: None.

Evaluation: Written examination.

CH-47D Electrical System

Administrative Notes


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CH-47D Electrical System

Introduction

Electricity is a fundamental force found everywhere in nature and has become one of the most powerful tools put to use by mankind.


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CH-47D Electrical System

Overview

  • For the next 4 hours, we will be discussing:

  • The CH-47D AC and DC electrical systems, how they function, some basic components.

  • There are 16 Enabling Learning Objectives (ELO).


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CH-47D Electrical System

ELO A

ACTION: Student read ahead assignment: Identify the basic properties of electricity.

CONDITION: Given a student handout.

STANDARD: IAW TM 55-1520-240-Series.



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CH-47D Electrical System

ELO B

ACTION: Student read ahead assignment: List the six common ways to produce electricity.

CONDITION: Given a student handout.

STANDARD: IAW TM 55-1520-240-Series.



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CH-47D Electrical System

ELO C

ACTION: Identify the electrical symbols used in CH-47D troubleshooting manual schematics.

CONDITION: Given a student handout and

TM 55-1520-240-T-1 and 2.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

Notes

Pay attention to the notes shown on the electrical schematics in the T-Manuals.


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CH-47D Electrical System

Schematics

  • Standardized and universally accepted methods used to diagram the flow of electricity from one component to the next.


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CH-47D Electrical System

Schematics

Each Component has a unique:

  • Symbol

  • Part number

  • Label



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CH-47D Electrical System

Schematics

Linking components together:

  • Wires

  • Terminal Boards

  • Diodes

  • Ground Points


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CH-47D Electrical System

Schematics

Wires:

  • Have a unique number assigned.

  • Either ink stamped or labeled.


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CH-47D Electrical System

Schematics

Terminal Boards:

  • Provide for the connection of one wire or component to another.

  • Are located throughout the airframe.


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CH-47D Electrical System

Schematics

Diodes:

  • Are one-way streets for electricity.

  • Most visible in the CH-47D connected to relays.


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CH-47D Electrical System

Schematics

Ground Points:

  • Allow a common return path for the flow of electricity.

  • Used for either AC or DC.



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CH-47D Electrical System

Schematics

Linking components together:

  • Switches

  • Relays


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CH-47D Electrical System

Schematics

Switches:

  • Turns on or off the flow of electricity.

  • Used for either AC or DC.


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CH-47D Electrical System

Schematics

Relays:

  • Nothing more than remotely controlled switches.

  • Often used to switch components or circuits with high power requirements.

  • Can be used to set up a “logic flow”.


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CH-47D Electrical System

Schematics

Battery Switch (161S1) and Battery Relay (161K1).



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CH-47D Electrical System

Schematics

Questions ?


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CH-47D Electrical System

Schematics

Press-To-Test Annunciator Lights.


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CH-47D Electrical System

Schematics

Transformers.


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CH-47D Electrical System

ELO D

ACTION: Identify the physical location of components listed on the CH-47D troubleshooting manual schematics.

CONDITION: Given a student handout and TM

55-1520-240-T-2.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

Locating Components

Simple Methodology

  • Using the schematic, start with components unique number.

  • Use the T-Manual to see what the component looks like.

  • Look up the number in the T-Manual to find the physical location.

  • Find the component on the airframe.


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CH-47D Electrical System

Locating Components

Questions ?


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CH-47D Electrical System

ELO E

ACTION: Chart the flow of current through an electrical schematic.

CONDITION: Given a student handout and TM

55-1520-240-T-2.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

Electron Flow

When tracing electrical flow on a schematic, start at the source of power and go towards ground.


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CH-47D Electrical System

Electron Flow

“Ground”

  • A a point that, if voltage was measured, the reading would be zero volts (DC circuit).

  • A common connection related to all other components in a circuit (AC or DC).


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CH-47D Electrical System

Electron Flow

“De-Energized”

  • Note that most schematics are drawn with the power turned off.

  • When troubleshooting, the mechanic must mentally turn on the circuit and trace the flow.

    Note: Using a High-Lighter often helps the beginner.


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CH-47D Electrical System

Electron Flow

Battery plugged in, but not turned on.


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CH-47D Electrical System

Electron Flow

Battery plugged in, and turned on.


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CH-47D Electrical System

Electron Flow

Questions ?


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CH-47D Electrical System

Electron Flow

Practical Exercise


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CH-47D Electrical System

Electron Flow

Searchlight switch turned on, closing relay.


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CH-47D Electrical System

Electron Flow

Searchlight light bulb on.


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CH-47D Electrical System

Electron Flow

Searchlight extending, an example of “Logic”.


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CH-47D Electrical System

ELO F

ACTION: List the sources of AC electrical power for the CH-47D.

CONDITION: Given a student handout and TM

55-1520-240-Series.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

AC Power Sources

3 Sources of AC Power

  • External Power.

  • Auxiliary Power Unit (APU) Generator.

  • Main Generator.


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CH-47D Electrical System

AC Power Sources

External Power

  • Lowest priority of power.

  • If the APU or a Main Generator is turned on, External Power will be disconnected.

  • “EXT PWR” Caution Light usually illuminated.


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CH-47D Electrical System

AC Power Sources

External Power

  • Usually supplied via AGPU, a GPU, or special hangar power supply.

  • Most commonly used as a source of power during post-phase or post-modification work order (MWO) power-on checks.


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CH-47D Electrical System

AC Power Sources

APU

  • Second highest priority of power.

  • As the APU generator comes on, External Power goes off.

  • The APU Generator will disconnect if a Main Generator comes on-line.


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CH-47D Electrical System

AC Power Sources

The APU is most commonly used for:

  • Start-up and shut-down of the helicopter.

  • Ground check-out and troubleshooting of systems.

  • During an in-flight emergency (dual generator failure).


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CH-47D Electrical System

AC Power Sources

Main Generators

  • Highest priority of power.

  • Turning on a Main Generator will disconnect the APU Generator or External AC Power.

  • Usable when the Rotor RPM is greater than 86%.


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CH-47D Electrical System

ELO G

ACTION: List the major components of the main AC generating system.

CONDITION: Given a student handout and TM

55-1520-240-Series.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

Main AC System Components

OIL INLET

PORT

PMG

SECTION

EXCITOR /

ROTATING

RECTIFIER

ASSEMBLY

OIL OUTLET

PORT

MAIN ROTOR

WINDINGS

Main Generator


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CH-47D Electrical System

Main AC System Components

Generator Control Unit (GCU)

  • Located in the left and right electrical compartments.

  • Receives power to operate from the PMG section of the Main Generator.


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CH-47D Electrical System

Main AC System Components

Generator Control Unit (GCU)

Monitors operation of the generator for:

  • Over-Voltage.

  • Under-Voltage.

  • Under-Frequency (an MTP check).

  • Feeder Fault.


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CH-47D Electrical System

Main AC System Components

GCU – Feeder Fault Protection


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CH-47D Electrical System

Main AC System Components

Main Generator Contactor

  • Located in the respective PDP.

  • Allows Generator to connect to Bus.

  • Relay power comes from GCU (28 VDC).

  • Permits Cross-Tie.


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CH-47D Electrical System

ELO H

ACTION: List the components of the APU AC system.

CONDITION: Given a student handout and TM

55-1520-240-Series.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

APU AC System Components

APU Generator

  • A 20 KVA, air cooled Generator mounted on the APU.


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CH-47D Electrical System

APU AC System Components

APU Generator – 3 Sections:

  • A PMG section.

  • An Exciter section.

  • A main generator section (rotor and stator).

    Functions similar to the Main Generator.


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CH-47D Electrical System

APU AC System Components

APU Generator Control Unit (GCU):

  • Located in right electrical compartment.

  • Receives power from the PMG.

  • Requires a conversion plug.


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CH-47D Electrical System

APU AC System Components

APU (GCU) provides protection for:

  • Under-Voltage.

  • Over-Voltage.

  • Under-Frequency.

  • Feed Fault.

    Functions similar to Main Generator System, voltages are slightly different.


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CH-47D Electrical System

APU AC System Components

APU Generator Slave Relay:

APU Generator Slave Relay

  • Located in # 2 PDP.

  • Requires 28 VDC from APU GCU to operate.

  • Provides Cross-Tie.


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CH-47D Electrical System

APU AC System Components

APU Generator Contactor:

  • Located in # 2 PDP.

  • Connects APU Generator to the Bus.

  • Requires 28 VDC from APU GCU to operate.

  • Provides Cross-Tie.


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CH-47D Electrical System

APU AC System Components

APU Generator Contactor:


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CH-47D Electrical System

ELO I

ACTION: List the components of the External AC Power System.

CONDITION: Given a student handout and TM

55-1520-240-Series.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

External AC Power System Components

External Power Receptacle:

  • Located just forward of the left electrical compartment.

  • AC power plug utilizes the lower connector.


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CH-47D Electrical System

External AC Power System Components

External Power Monitor:

  • Located in the Left Electrical Compartment.

  • Monitors for:

    - Proper Voltage, Frequency,

    and Phase Sequence.


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CH-47D Electrical System

External AC Power System Components

External Power Contactor:

  • Located in the # 1 PDP.

  • Connects External AC Power to the Bus.

  • Provides AC Cross-Tie.


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CH-47D Electrical System

External AC Power System Components

External Power Contactor:


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CH-47D Electrical System

ELO J

ACTION: Analyze the application of External AC Power to the aircraft electrical system.

CONDITION: Given a student handout and TM

55-1520-240-Series.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

Analyze External Power Application


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CH-47D Electrical System

Analyze External Power Application


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CH-47D Electrical System

Analyze External Power Application


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CH-47D Electrical System

Analyze External Power Application


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CH-47D Electrical System

Analyze External Power Application


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CH-47D Electrical System

ELO K

ACTION: Analyze the application of the # 1 Main Generator AC Power to the aircraft electrical system.

CONDITION: Given a student handout and TM

55-1520-240-Series.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

Analyze #1 Generator Power Application


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CH-47D Electrical System

Analyze #1 Generator Power Application


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CH-47D Electrical System

Analyze #1 Generator Power Application


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CH-47D Electrical System

Analyze #1 Generator Power Application


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CH-47D Electrical System

Analyze #1 Generator Power Application


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CH-47D Electrical System

ELO L

ACTION: List the sources of DC power for the CH-47D.

CONDITION: Given a student handout and TM

55-1520-240-Series.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

DC Power Sources

3 DC Power Sources:

  • External DC.

  • Transformer-Rectifier.

  • Battery


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CH-47D Electrical System

DC Power Sources

External DC Power:

  • Highest priority of DC power.

  • Supplied by AGPU, GPU, or hangar power supply.


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CH-47D Electrical System

DC Power Sources

Transformer-Rectifier (T/R):

  • Second highest priority of DC power.

  • Normally powers the Bus when a Generator is on-line.

  • Will power all DC Buses except Battery Bus.


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CH-47D Electrical System

DC Power Sources

Battery:

  • When no other source is available, the Battery will power –

    The Battery Bus, the Switched Battery Bus, and the Essential Bus.


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CH-47D Electrical System

ELO M

ACTION: List the components of the Transformer-Rectifier system.

CONDITION: Given a student handout and TM

55-1520-240-Series.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

T/R System Components

  • Transformer-Rectifier (T/R).

  • Reverse Current Cutout (RCCO).


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CH-47D Electrical System

T/R System Components

Transformer-Rectifier:

  • Located in the Left and Right Electrical compartments.

  • Converts 115 VAC to 28 VDC via a step-down transformer and a rectifier (diode) circuit.

  • Can supply up to 200 amps.


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CH-47D Electrical System

T/R System Components

Reverse Current Cutout (RCCO):

  • Located in the respective PDP.

  • Protects the T/R from reverse current (voltage).

  • Connects T/R output to the DC Bus.


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CH-47D Electrical System

ELO N

ACTION: List the components of the battery and charging system.

CONDITION: Given a student handout and TM

55-1520-240-Series.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

Battery and Charging System Components

  • Battery Charger (NICAD only).

  • Battery (NICAD).

  • Battery (SLAB).


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CH-47D Electrical System

Battery and Charging System Components

Battery Charger (NICAD only):

  • Located in the Left Electrical Compartment.

  • Monitors and controls the state of charge.

  • Converts 115 VAC to 28 VDC

  • Is slowly being phased out.


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CH-47D Electrical System

Battery and Charging System Components

Battery Charger monitors Battery for:

  • Over-temperature.

  • Cell imbalance.

  • Open circuit.

  • Charger fault.


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CH-47D Electrical System

Battery and Charging System Components

Battery (NICAD):

  • Located in the Left Electrical Compartment.

  • It is a nickel-cadmium battery that uses potassium hydroxide (base) as an electrolyte.


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CH-47D Electrical System

Battery and Charging System Components

Battery (SLAB):

  • Newest Battery used in Army aviation.

  • Sealed Lead Acid Battery (SLAB) utilizing sulfuric acid as the electrolyte.

  • Different design, same rating as NICAD.

  • Lower maintenance requirement.


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CH-47D Electrical System

ELO O

ACTION: List the components of the DC External Power System.

CONDITION: Given a student handout and TM

55-1520-240-Series.

STANDARD: IAW TM 55-1520-240-Series.


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CH-47D Electrical System

DC External Power System Components

External Power Receptacle:

  • Used to connect External DC (or AC) power.

  • Located on the forward side of the Left Electrical Compartment.


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CH-47D Electrical System

DC External Power System Components

4 DC Relays provide a Logic circuit:

  • External Power Relay (161K7).

  • External Power Control Relay (161K9).

  • Both RCCO Relays (161K3 and 161K4).


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CH-47D Electrical System

DC External Power System Components

Reverse DC Polarity Protection (Blocking) Diode:

  • Prevents voltage with incorrect polarity from being applied to the DC Bus.

  • Won’t allow 161K7 and 161K9 to operate.


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CH-47D Electrical System

DC External Power System Components

Practical Exercise:

Complete the final Practical Exercise in the Student Handout at your leisure.


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CH-47D Electrical System

Summary&Questions?