Connectors DC Power Distribution Flashcards
What are the four common sources of electrical power supplied to the aircraft?
DC alternators
DC generators
AC alternators
The aircraft batteries
What aircraft are AC alternators used on?
Transport category and some military aircraft
A simple power distribution system contains a basic copper conductor called:
a bus bar or bus
Each circuit is typically connected to what?
the bus through a fuse or circuit breaker
A wire system with several bus bars would normally be found on what type of aircraft?
Large and more complex aircraft
Busses are often categorized as (6):
AC
DC
Left
Right
Essential
Non-essential
What is a general concern relating to an aircraft’s electrical systems?
Short circuits starting fires
To protect the aircraft, adequate protective devices must be provided. These devices include:
Fuses
Circuit Breakers
Cut-out Relays
All resettable protection devices must be what?
trip-free
Electrical loads are considered to be either:
continuous or intermittent
Continuous load circuits are those that are typically in operation for MORE than:
two minutes
Intermittent load circuits are those that are typically in operation for LESS than:
two minutes or less
Prior to installing any electrical equipment in an aircraft, the tech must perform:
an electrical load analysis
All aircraft electrical systems are designed with:
a bus hierarchy
The most critical AC/DC systems are powered on which busses?
AC essential and DC essential busses, or standby busses
Most manufacturers prefer to divide the aircraft schematics into:
individual systems
This becomes a necessity when dealing with large, complex aircraft
Large aircraft power systems normally employ which type of power source?
DC Generator (older aircraft) and batteries
or
An alternator (newer aircraft) and batteries
What does the Reverse Current Relay (RCR) do?
Prevents current from returning to the alternator or generator field windings should battery voltage become greater than the output of the alternator/generator
What are current limiters or Isolation limiters?
High amperage fuses
Only found on aircraft with DC generators or starter/generators
Current limiters act as a:
slow-blow fuse
Composite aircraft will require what to return electrical power back through the system?
A ground plane
Some aircraft use what in the construction of the composite.
A wire mesh
What must be maintained and properly installed to ensure a good ground plane?
Bonding strips
An inverter can be powered by the:
DC essential buss to provide essential AC power
An inverter is used on some light and business type aircraft to:
operate a limited number of AC powered system
