Each switch and light on PS1’s Electrical Panel is fully functioning and networked with a sophisticated system of busses and relays. Like on the real aircraft, the electrical system is continuously being monitored through the EICAS interface. PS1’s electrical simulation incorporates all indicator lights, EICAS Alert Messages and most Status Messages. The electrical system and all other simulated systems are running in real time, simultaneously. Should a certain electrical bus be unpowered (due to automatic isolation or manual disconnection), the associated devices become inoperative -- and/or another back-up system is automatically activated.

All power sources are modeled in detail:
- The 4 Integrated Drive Generators (IDGs), incl. IDG malfunctions.
- The 2 APU driven generators, incl. APU malfunctions.
- 2 External Power sources.
- The Main Battery and the APU Battery, incl. charger malfunctions.

The simulation includes, of course, the entire AC Bus Tie system logic with its Bus Tie Breakers (BTBs) and the Synchroneous Bus with its automatic Split System Breaker (SSB) as well as the Autoland Bus Isolation feature. A detailed diagram of the AC and DC busses is shown in the PS1.3 Operations Manual. Also included in the manual is a comprehensive Bus Equipment List (as to which device is connected to which bus).

Limitations in version 1.3: The Maintenance and Circuit Breaker Panels are not visible, i.e. the simulation considers the maintenance related switches and C/Bs in normal positions. The Towing Power Switch (airline specific) is always set to “on”. The Ground Service Switch (door 2L) is always connected to the power source currently available (Ext 1/APU 1, or AC Bus 1).

Examples - Standby Power System

Example 1 -
 

- No system fault

- In flight

- Standby Power
   Selector in AUTO

- Battery Switch ON

APU Standby Bus & Main Standby Bus are powered by AC Bus 3.

Example 2 -
 

- AC Bus 3
   unpowered

- In flight

- Standby Power
   Selector in AUTO

- Battery Switch ON

Automatic reconfiguration: APU Standby Bus & Main Standby Bus are now powered by AC Bus 1.

Example 3 -
 

- AC Bus 1 and 3
   unpowered

- In flight

- Standby Power
   Selector in AUTO

- Battery Switch ON

Automatic reconfiguration: APU Standby Bus & Main Standby Bus are now powered by the batteries.

Example 4 -
 

- AC Bus 1 and 3
   powered

- On ground

- Standby Power
   Selector in BAT

- Battery Switch ON

Automatic reconfiguration: APU Standby Bus & Main Standby Bus are powered by the batteries. Main and APU battery chargers are unpowered.

In the screen shot below a malfunction occured in generator #3. This generator should now be disconnected by the pilot. Once disconnected, the generator can only be re-connected by maintenance personnel when the aircraft is on the ground (in the simulator on the Instructor’s Page). The picture shows also the AC Tie Bus devided into two halves by the SSB. EXT Power 1 has been pushed ON which has automatically turned off GCB 1 and 2 and opened the SSB as the frequency of the various AC power sources cannot be synchronized.

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