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related AC BUS is lost.
FAILURE OF ONE ENGINE GENERATOR
The system automatically replaces the failed generator by the other engine generator of the same
side, through the associated AC BUS or the APU generator if available.
FAILURE OF TWO ENGINE GENERATORS LOCATED ON OPPOSITE SIDES
The system automatically replaces each failed generator by the other engine generator of its side,
or by the APU generator if available.
FAILURE OF TWO ENGINE GENERATORS LOCATED ON THE SAME SIDE
The system automatically replaces the failed generators by the outer engine generator of the other
side, or by the APU generator if available.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - OPERATIONS
A330/A340 FLEET DSC-24-10-30-30 P 2/16
FCOM 19 AUG 10
FAILURE OF THREE ENGINE GENERATORS
If APU generator is available it replaces all failed engine generators.
If APU generator is not available, the AC NORM BUS on one side are lost.
EXAMPLE GEN 1 remaining
Note: If the remaining generator is on the right side, the AC ESS BUS is automatically supplied
by the AC BUS 2.4.
FAILURE OF ONE ENGINE GENERATOR
Applicable to: ,
FAILURE OF ONE ENGINE GENERATOR
ECMU provides automatic reconfiguration.
Complete network remains supplied.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - OPERATIONS
A330/A340 FLEET DSC-24-10-30-30 P 3/16
FCOM 19 AUG 10
Note: If a generator is lost due to overcurrent detection, reconfiguration does not occur and the
related AC BUS is lost.
The system automatically replaces the failed generator with :
‐ The APU generator if available or,
‐ The other engine generator (automatically shedding part of the galley load).
FAILURE OF THE AC BUS 1.1
Applicable to:
The AC BUS 2.4 automatically supplies the AC ESS BUS and the ESS TR
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - OPERATIONS
A330/A340 FLEET DSC-24-10-30-30 P 4/16
FCOM 19 AUG 10
FAILURE OF THE AC BUS 1
Applicable to: ,
The AC BUS 2 supplies the AC ESS BUS and the ESS TR automatically.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - OPERATIONS
A330/A340 FLEET DSC-24-10-30-30 P 5/16
FCOM 19 AUG 10
TR FAILURES
Applicable to:
The contactor of each TR automatically opens, in case of :
‐ Overheat
‐ Minimum current
‐ Overcurrent
‐ Open or short circuit.
The ECMU provides automatic reconfiguration (except for APU TR).
Note: If a TR is lost due to overcurrent detection, reconfiguration does not occur and the related
DC BUS and DC BAT BUS are lost.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - OPERATIONS
A330/A340 FLEET DSC-24-10-30-30 P 6/16
FCOM 19 AUG 10
FAILURE OF ONE TR
• TR 1 or 2 lost : The available TR replaces the faulty one.
• ESS TR lost : TR 1 replaces the ESS TR.
FAILURE OF ESS TR AND TR 1 (OR TR 2)
The remaining TR supplies the two DC norm busses and the DC BAT bus.
The DC ESS bus is lost.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - OPERATIONS
A330/A340 FLEET DSC-24-10-30-30 P 7/16
FCOM 19 AUG 10
TR FAILURES
Applicable to: ,
The contactor of each TR automatically opens, in case of :
‐ Overheat
‐ Minimum current
‐ Overcurrent
‐ Open or short circuit.
The ECMU provides automatic reconfiguration (except for APU TR).
Note: If a TR is lost due to overcurrent detection, reconfiguration does not occur and the related
DC BUS is lost.
FAILURE OF ONE TR
• TR 1 or 2 lost : The available TR replaces the faulty one.
• ESS TR lost : TR 1 replaces the ESS TR.
FAILURE OF ESS TR AND TR 1 (OR TR 2)
The remaining TR supplies the two DC norm busses and the DC BAT bus.
The DC ESS bus is lost.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
DESCRIPTION - OPERATIONS
A330/A340 FLEET DSC-24-10-30-30 P 8/16
FCOM 19 AUG 10
EMERGENCY GENERATION AFTER LOSS OF ALL MAIN GENERATORS
Applicable to:
If both, AC1.1 and 2.4, are lost and if the engines 1 and 4 are lost, the Ram-Air Tubine (RAT)
extends automatically.
If only powered by the RAT, the EMER GEN is inhibited when slats are extended.
The emergency generator can be manually activated through the MAN ON pushbutton.
Emergency generator deactivation occurs only automatically :
In flight : At slats extension ; if only powered by the RAT ‐ (engines 1 and 4 lost), it can be
　
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