Systems Guide

A318/A319/A320/A321

Professional

SYSTEMS

Systems guide

Vol

04-03-34

11 July 2018

The windshields consist of multi layered glass and are

electrically heated to prevent icing. Two of the windows

have sliding mechanisms. To open the windows left

mouse click on the handle. The window will be opened

by a rattle mechanism. To close the window, right

mouse click on the handle. Make sure the red ring

underneath the release button is shown to indicate the

window is locked. The status of the windows is also

shown in the ECAM DOORS page.

To close the window first click the little lever on the window rail to unlock it.

ELECTRICAL

GENERAL

In normal operation the generation and distribution of electrical power is fully automated and does not

need any interaction. Even when there are failures the systems will almost always be able to correct or

activate alternate systems when needed. As with all overhead panels a dark panel with all lights off

indicates systems without fault and in automatic mode.

AC GENERATION

AC power is distributed via the two AC buses. Each engine generator supplies one of the two buses, but a

tie connection allows one of the generators to provide both buses. The APU generator can be used as the

sole source for all systems, excluding the galleys. Note that at high altitude the APU generator load

capacity is decreased. When available, Ground Power can provide all buses with electricity. The two

batteries are connected to the buses via a static converter. An automated bus tie system interconnects all

systems.

AC BUSES

There are 5 buses for AC power:

1. AC1 Bus

2. AC2 Bus

3. AC ESS Bus

4. AC ESS SHED Bus

5. AC Ground/Flight (the latter is ignored)

DC GENERATION

The DC system powers the DC components and is needed to start the APU when no EXT PWR is available.

The DC electrical system is the first backup for the AC system and will power essential components when

all AC generators are offline. In normal operation three transformer rectifiers (TRs) convert AC to DC and

AC1 is the first source for DC power.

Two NICAD batteries connect to their own hot battery bus that is always active. The batteries are charged

using the DC BAT bus and disconnected from all buses when they are not needed and fully charged. The

batteries use proprietary code, so they will not lose power as fast as standard P3D batteries. Depending

on your use you should be able to run the systems on battery for up to half an hour. Of course, it is