Airbus A340 Series, Brochure

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STL 472.502/90 Issue 6
TOTAL
LOSS OF
ALL MAIN
GEN
A340 Electrical System
3.4
Distribution - abnormal configurations
Generator failure
If one generator fails, another will automatically take over :
• If APU is operative, APU generator will take over.
• If APU generator is not available, the same side, external
generator will take over.
• If same side generator is not available, the opposite side
external generator will take over.
In case of a total loss of all main generators :
• The EMER GEN will deliver 5.5 kVA since the Green
hydraulic system is still powered by engine-driven pumps
or
In case of loss of all engines :
• The EMER GEN will deliver 3.5 kVA since the Green
hydraulic system is then powered by the RAT ; in this
case, the batteries take over when slats are extended.
TR failure
If one TR fails, the other will automatically take over its
corresponding DC network via DC BAT BUS,
In case of double TR failure :
• TR 1 and 2 : DC BUS 1 and DC BUS 2 are lost
• TR 1 (or 2) and ESS TR : The remaining TR supplies
DC BUS 1 + 2 and DC BAT BUS ; the DC ESS BUS is
lost.