background
x
loader
System Description
arrow By ATA By Message Color By Observed Faults by MDCBy Tips

Select color for CAS message that you wish to troubleshoot

(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

This page includes :

     

For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

11/13/15

Overview

The DC electrical load distribution system supplies electrical power from the power sources to the aircraft electrical loads.

The system provides automatic or manual control and connection, protection of the loads, protection of distribution buses, and detection of fault conditions of its components. The DC electrical load distribution system has a primary and secondary power distribution system.

The primary power distribution system is made up of the left DCPC, right DCPC, and auxiliary power unit (APU) DCPC. The DCPCs provide the connection between the power sources (DC generators, left and right batteries, and external power) and the aircraft loads.

They supply electrical power to the aft section of the aircraft and to the secondary power centers (SPCs). The DCPCs protect loads from unsatisfactory electrical power quality. They connect and control the distribution system, manually and automatically.

When fault conditions occur, the DCPCs protect the applicable distribution buses, cables, and loads. The DCPCs also find fault conditions and transmit the data for the engine indicating and crew alerting system (EICAS) and maintenance.

Note: 
A high load is a load that uses more than 25 A. A medium load is a load that uses more than 5 A, to a maximum of 25 A.

The secondary power distribution system is made up of two secondary power centers (SPCs), four junction boxes (JBs), and two circuit breaker panels (CBPs). The left and right SPCs supply electrical power to high/medium loads that are in the forward section of the aircraft. They also mechanically connect the power available on the DCPC distribution buses to the CBPs.

The JBs (JB1, JB2, JB3, and JB4) are electrical interfaces for the aircraft electrical systems. They connect signals, perform mechanical connection functions, and test systems in the aircraft.

Note: 
Although included as part of the DC electrical load distribution system, the JBs are more related to electronic signals connections than to DC electrical load distribution connections.

The left and right CBPs provide short circuit protection and supply electrical power to the loads that must be controlled from the flight compartment. The right circuit breaker panel also connects the electrical power from the standby instrument battery to aircraft loads.

300_2460_003

300_2460_001

300_2460_002

11/13/15

System Interface

The DC electrical load distribution system interfaces with the other aircraft systems/components that follow:

  • Primary DC Power System
  • Battery System
  • External DC Power
  • Cockpit Circuit Breaker Panel (CCBP)
  • Engine Indication and Crew Alerting System (EICAS)
  • Proximity Sensor Electronic Unit (PSEU)

Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.