Page 187 - Demo

CHINA AIRLINES
AOM A330-300
OEB
ELEC EMER CONFIG
2.50/5
REV 25
REASON FOR ISSUE :
This OEB is issued to introduce a new action step that the flight
crew must apply during approach, in the case of an ELEC EMER
CONFIG ECAM warning .
EXPLANATION :
Recent analyses have demonstrated that on A330 aircraft, if the aircraft is in EMER ELEC configuration and single hydraulic Engine Driven Pump (EDP) operation, the following may cause the loss of the emergency generator: In turbulent weather conditions during approach, the increased hydraulic demand from the flight control system and the emergency generator may not be satisfied when the flight crew sets the LAND RECOVERY pb-sw to ON. As a result, the priority valve may close, and cause the loss of the emergency generator.
Therefore, the batteries become the only source that can supply power to the aircraft electrical network.
OPERATION RECOMMANDATIONS
To supply the aircraft with sufficient green hydraulic power and prevent closure of the priority valve in case of single EDP operation, the flight crew must manually extend the Ram Air Turbine (RAT) before they set the LAND RECOVERY pb-sw to ON, when they apply the ELEC EMER CONFIG ECAM procedure. Due to the extension of the RAT, the speed must not be less than 140 kt. Therefore, the flight crew must ensure that the approach speed (VAPP) is at least 140 kt and confirm the corresponding landing distance.
PROCEDURE
Apply the ELEC EMER CONFIG ECAM procedure.
For Slats extension, before setting the LAND RECOVERY pb-sw to
ON, press the RAT MAN ON pb to extend the RAT and resume application of the ELEC EMER CONFIG ECAM procedure.