Systems Guide

Aerosoft
Airbus A320/A321
SYSTEMS
Systems guide
Vol
4
04-03-34
28 October 2014
PRIORITY LOGIC
The priority logic determines which source is used. When that source is lost the system will automatically switch
to the next available source.
1. Engine Generators
2. External Power
3. APU Generator
4. Ram Air Turbine (not simulated)
5. Batteries
For example, if the aircraft is run from APU generator and EXT PWR comes online the system will automatically
switch to EXT POWER but when engine generators come online they will be used.
GROUND POWER
Using the GROUND SERVICES menu on the right MCDU it
is possible to display a Ground Power Unit and to actually
let it supply the electrical power.
 EXT. POWER GPU: will activate ground power
and will show a Ground Power Unit
 EXT. POWER: will activate ground power but will
not show the Ground Power Unit (use this one in
combination with AES)
ECAM ELEC SYSTEM DISPLAYS
The ECAM ELEC pages show the configuration of the electrical system and the relevant values of all systems.
 The battery indications (BAT 1 & BAT 2) normally appear white but will show in amber if voltage drops
below 25 volt. Voltage and Amperage is shown. Connection lines or arrows between the battery and the
DC BUS icon show if the batteries are connected, discharging or charging.
 The TR indications (TR 1 & TR 2) display in green when the values are within normal limits and in amber
when these are exceeded. Output voltage (V) and amperage (A) are shown.