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priority logic in order to maintain power supply to all AC buses. The three
contactors close when :
only one engine ‐ generator supplies the aircraft, or
‐ only the APU generator or single ground power unit supplies the aircraft.
OFF : The three BUS TIE contactors open.
(12) EXT A pb : (momentary action)
AVAIL lt : Illuminates green provided external power parameters are normal.
Momentarily
pressed
: ‐ If the AVAIL light was on :
• The external power line contactor closes
• The AVAIL light goes off
• The ON light comes on blue
‐ If the ON light was illuminated :
• The external power line contactor opens
• The ON light goes off
• The AVAIL light comes on.
(13) EXT B pb : (momentary action)
AVAIL lt : Illuminates green provided external power parameters are normal.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-24-20 P 12/48
FCOM 19 AUG 10
Momentarily
pressed
: ‐ If the AVAIL light was on :
• Provided the APU generator is off the external power line contactor
closes
• The AVAIL light goes off
• The AUTO light comes on.
‐ If the AUTO light was on :
• The external power line contactor opens
• The AUTO light goes off
• The AVAIL light comes on.
Note: 1 . The APU generator has priority over external power (A and B) for AC BUS 1.
The external power A has priority over the APU generator for AC BUS 2.
The engine generators have priority over the external power.
The APU generator has priority over external power B for AC BUS 2.
The external power B has priority over external power A for AC BUS 1.
2 . When external power B is selected AUTO, AUTO light remains illuminated
even when the APU generator has taken over.
OVERHEAD PANEL (CONT'D)
Applicable to:
(1) MAN ON pb (guarded)
AUTO : In case of normal AC supply loss in flight, the emergency generator is automatically
started.
Pressed: The emergency generator runs and is connected to the aircraft network.
(2) EMER GEN FAULT lt
The light comes on red, if the emergency generator is not supplying and normal AC supply is
lost in flight.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-24-20 P 13/48
FCOM 19 AUG 10
(3) TEST pb (guarded)
Pressed: The emergency generator runs (provided the green hydraulic system is
pressurized) and supplies the DC ESS BUS and the AC ESS BUS.
(4) LAND RECOVERY pb sw
ON : When pressed in electrical emergency configuration, the AC LAND RECOVERY
and the DC LAND RECOVERY buses are recovered and the following equipment
is restored :
‐ LGCIU 1
‐ SFCC 1 (flap channel is not recovered, if the emergency generator is powered by
the RAT)
‐ ILS 1
The remaining fuel pump (if any) is lost.
Note: The remaining fuel pump will be shed at 260 kt, if the emergency
generator is powered by the RAT, or upon LAND RECOVERY selection,
whichever occurs first.
OVERHEAD PANEL (CONT'D)
Applicable to:
(1) MAN ON pb (guarded)
AUTO : In case of normal AC supply loss in flight, the emergency generator is automatically
started.
Pressed: The emergency generator runs and is connected to the aircraft network.
(2) EMER GEN FAULT lt
The light comes on red, if the emergency generator is not supplying and normal AC supply is
lost in flight.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
ELECTRICAL
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-24-20 P 14/48
FCOM 19 AUG 10
(3) TEST pb (guarded)
Pressed: The emergency generator runs (provided the green hydraulic system is
pressurized) and supplies the DC ESS BUS and the AC ESS BUS.
(4) LAND RECOVERY pb sw
ON : When pressed in electrical emergency configuration, the AC LAND RECOVERY
and the DC LAND RECOVERY buses are recovered and the following equipment
is restored :
‐ LGCIU 1
‐ SFCC 1 (flap channel is not recovered, if the emergency generator is powered by
the RAT)
The remaining fuel pump (if any) is lost .
Note: The remaining fuel pump will be shed at 260 kt, if the emergency
generator is powered by the RAT, or upon LAND RECOVERY selection,
whichever occurs first.
OVERHEAD PANEL (CONT'D)
Applicable to: ,
(1) MAN ON pb (guarded)
AUTO : In case of normal AC supply loss in flight, the emergency generator is automatically
started.
Pressed: The emergency generator runs and is connected to the aircraft network.
　
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