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A330 RAT

Old 10th Feb 2019, 09:10
  #1 (permalink)  
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Join Date: Aug 2004
Location: italy
Posts: 143
A330 RAT

Hi guys,

around 1 year ago airbus published an OEB for the emergency elec conf. It said that before slat extension the pilot had to push the rat push button.
After a while they put this action in the summary and they removed the oeb.

Does somebody remember why we have to extend the rat?

thanks
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Old 11th Feb 2019, 11:04
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Join Date: Apr 2009
Location: UK
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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.
Operational Recommendations
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
ELECEMER 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
ELECEMER 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
ELECEMER CONFIG
ECAM procedure.
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Old 12th Feb 2019, 17:41
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Join Date: Aug 2004
Location: italy
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Thanks

What I need!!
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