SmartCockpit Dash8 - User Manual

12.5 (ATA 24) ELECTRICAL POWER
12.5.1 Introduction
The Electrical Power Generation and Distribution System (EPGDS) is used to supply the electri-
cal energy for all onboard electrical equipment. The EPGDS has DC and AC generating sys-
tems. The DC generation system includes a battery system. The EPGDS provides for energy
conversion, distribution, storage, control, protection, monitoring, and indication to the flight crew.
Provision is made for external connection of DC or AC external power while on the ground.
12.5.2 General
The DC generation system is supplied by three NiCad batteries, two engine driven starter/gener-
ators, two Transformer Rectifier Units (TRUs) and an optional Auxiliary Power Unit (APU). The
TRUs supply 28VDC and are powered by two engine driven Alternating Current (AC) generators
that supply 115Volts Alternating Current (VAC).
The power is distributed by an electrical bus system. It re configures for individual power source
and bus failures, by the automatic closing and opening of bus tie contactors.
There are both DC and AC external power receptacles for Ground Power Unit (GPU) connection.
All AC and DC aeroplane services can be operated from the AC generators or the AC external
power alone.
Dash8 - Q400 - Electrical
Page 1

Summary

ATA 24 Electrical Power System

Introduction to Electrical Power

Overview of the Electrical Power Generation and Distribution System (EPGDS).

General Electrical Power System Description

Details on DC and AC generation, distribution, and external power.

Controls and Indications - Electrical Power

Describes controls and indications for electrical power management.

DC System Controls and Operation

DC Control Panel and Switches

Callouts for DC Control Panel switches (Battery, Generator, Bus Tie).

DC External Power Switch Operation

Function and operation of the DC External Power switch.

AC System Controls and Operation

AC Control Panel and Generator Switches

AC Control Panel overview and operation of AC external power and generator switches.

Multi-Function Display (MFD) Electrical Information

MFD DC System Annunciations and Loads

Callouts for DC power annunciations, battery status, and load displays on the MFD.

MFD AC System Annunciations and Loads

Callouts for AC power annunciations, generator status, and load displays on the MFD.

MFD Generator and TRU Load Displays

Details on displaying generator and TRU loads on the MFD.

Pilot Circuit Breaker Panel Layouts

Pilots Lower Circuit Breaker Panel

Diagram of the pilot's lower circuit breaker panel.

Pilots Upper Circuit Breaker Panel

Diagram of the pilot's upper circuit breaker panel.

Copilot Circuit Breaker Panel Layouts

Copilots Lower Circuit Breaker Panel

Diagram of the copilot's lower circuit breaker panel.

Copilots Upper Circuit Breaker Panel

Diagram of the copilot's upper circuit breaker panel.

DC System Detailed Operation

EPGDS and EPCU Functionality

Function of the Electrical Power Control Unit (EPCU) and system reconfigurations.

DC Generation Sources and Priority

Sources of DC power and their priority for supplying buses.

Battery Operation and Characteristics

Details on battery types, locations, capacities, and operational logic.

Starter;Generator, TRU, and APU Operation

Function of starter/generators, TRUs, and APU generator.

Fault Tolerant Operation and Bus Fault Protection

EPCU's response to power source failures and bus fault protection.

Bus Failures and Engine Starting Modes

Response to bus failures and description of engine starting modes.

AC System Detailed Operation

AC Power Sources and Variable Frequency

Details on AC generators and their variable frequency output.

AC External Power and Protection

Connection, protection, and monitoring of AC external power.

Circuit Breaker Functions

Explanation of circuit breakers protecting the electrical system.

SmartCockpit Dash8 Specifications

General

Brand	SmartCockpit
Model	Dash8
Category	Tools
Language	English