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FCTM 17 JUN 09
INTRODUCTION TO EMERGENCY ELECTRICAL CONFIGURATION
Applicable to: ALL
The procedure discussed in this section is the EMERGENCY ELECTRICAL CONFIGURATION.
Whilst it is very unlikely that this failure will be encountered, it is useful:
• To refresh on the technical background
• To recall the general guidelines that must be followed in such a case
• To outline the main available systems according to the electrical power source.
TECHNICAL BACKGROUND
Applicable to: ALL
The electrical emergency configuration is due essentially to the loss of all main AC BUS which
causes the engagement of the emergency generator.
In most cases, this is due to an anomaly on the electrical network, e.g. a short circuit. All engine
generators trip and the Emergency Generator is driven by the Engine Driven Pump (EDP). In this
scenario, the probability to restore electrical power using the APU generator is low.
An other cause for electrical emergency configuration could be a combination of electrical failures
and engine failures. In this scenario, you may restore electrical power using the APU generator.
Depending on which engine (s) is (or are) failed, and on the availability of green hydraulic engine
driven pumps, the emergency generator may be driven by the RAT. In this case, it outputs
approximately half electrical power of the previous scenario. It should be noted however, that at high
speed i.e. above 260 ft IAS, the Emergency Generator electrical power is increased as it takes credit
from the engine windmill effect.
However, it must be highlighted that the probability of this last scenario is low. This is why, the
summary available in the QRH do not take it into account.
GENERAL GUIDELINES
Applicable to: ALL
1 The following guidelines apply whatever the power source is, i.e. EDP or RAT:
As only PFD1 is available, the left hand seat pilot becomes PF. Once a safe flight path is established,
and the aircraft is under control, ECAM actions will be carried out.
This is a serious emergency and ATC should be notified using appropriate phraseology (“MAYDAY”).
Although the ECAM displays LAND ASAP in red, it would be unwise to attempt an approach at a
poorly equipped airfield in marginal weather. The power source for the Emergency Generator will
assist the crew’s decision making in this context, as the aircraft is in a much better configuration
when the Emergency Generator is being powered by the EDP rather than the RAT. In either case
however, prolonged flight in this configuration is not recommended.
Crews should be aware that workload is immediately greatly increased.
A330/A340 FLIGHT CREW TRAINING MANUAL
ABNORMAL OPERATIONS
ELECTRICAL
A330/A340 FLEET AO-024 P 2/6
FCTM 17 JUN 09
As only the EWD is available, disciplined use of the ECAM Control Panel (ECP) is essential, (Refer
to OP-040 ECAM HANDLING).
Consideration should be given to starting the APU as indicated by the ECAM and taking into account
the probability to restore using APU generator as mentioned above.
A clear reading of STATUS is essential to assess the aircraft status and properly sequence actions
during the approach.
The handling of this failure is referred to as a "complex procedure". A summary for handling the
procedure is included in the QRH, which will be referred to upon completion of the ECAM procedure.
The ELEC EMER CONFIG SYS REMAINING list is available in QRH.
The LAND RECOVERY pb should be pressed prior to commencing the approach. This action will not
be delayed since this will allow the recovery of a number of systems required for landing, e.g. ILS
1 (if MMR not installed), SFCC 1, whilst shedding a number of systems that are no longer required,
e.g. the operative fuel pump(s).
The landing gear must be extended by gravity and Nose Wheel Steering is lost in all cases. When
the Emergency Generator is powered by EDP, this avoids strong fluctuation of the green hydraulic
pressure which may cause a spurious disconnection of the Emergency Generator
REMAINING SYSTEMS
Criteria: S18882, 330-200
Applicable to: , , , , , , , , , ,
2
The electrical distribution has been designed to fly, navigate, communicate and ensure passengers
comfort.
A330/A340 FLIGHT CREW TRAINING MANUAL
ABNORMAL OPERATIONS
ELECTRICAL
A330/A340 FLEET AO-024 P 3/6
FCTM 17 JUN 09
However, depending on the power source i.e. EDP or RAT, some differences should be outlined:
• Emer Gen powered by the EDP
Significant remaining systems in ELEC EMER CONFIG
FLY PFD1, AP1, Pitch trim, rudder trim, alternate law
NAVIGATE ND1, FMGC1, radar, RMP1, VOR1, DME1, (ILS1, GPS1 if MMR installed)
　
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