Lessons
Electrical System Overview
15 min
AC Power Generation
20 min
DC Power Generation
18 min
Emergency Electrical Config
25 min
External Power
12 min
APU Generator
15 min
Battery System
18 min
Bus Tie Configuration
22 min
Load Shedding Logic
20 min
ECAM Electrical Page
15 min
Abnormal Procedures
30 min
Module Assessment
45 min
Load Shedding Logic
Understanding load shedding is critical for managing electrical emergencies. The A320 uses an automatic load shedding system that prioritizes essential flight systems when power generation capacity is reduced.
A320 Electrical System — Normal Configuration Diagram
Key Concept
During load shedding, the system follows a priority hierarchy: Flight controls → Navigation → Communication → Lighting → Galley. Non-essential loads are shed first to preserve power for critical systems.
ECAM Warning
When load shedding activates, ECAM displays "ELEC - BUS SHED" on the Engine/Warning Display. Pilots must verify which buses are lost and adjust procedures accordingly.
Load Shedding Priority
| Priority | Bus | Systems Powered | Status |
|---|---|---|---|
| 1 (Essential) | AC ESS | FD, EFIS, VHF1, ATC | Always Powered |
| 2 (Essential) | DC ESS | FCU, FMGC1, Clock | Always Powered |
| 3 (Normal) | AC 1 | ENG 1 instruments, Probe heat | Shed if needed |
| 4 (Normal) | AC 2 | ENG 2 instruments, Galley | First to shed |