MD-11 Flight Crew Operations Manual
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Electrical -
Description and Operation
Elec.10.6
With the EMER PWR selector in the ARM position and the BAT switch in the ON
position (emergency power armed), the left emergency ac and dc buses will
automatically transfer to main battery power when either the left emergency ac or
dc bus is de-energized (emergency power on).
The ADG is an air cooled, turbine generator that consists of an air turbine unit,
brushless generator, and voltage regulator.
With emergency power on and the ADG deployed, the ADG will supply electrical
power to:
• The left emergency ac bus and auxiliary hydraulic pump 1 when the ADG
ELEC switch is in the OFF position (battery supplies the left emergency
dc and battery bus for 90 minutes).
• The left emergency ac bus, left emergency dc bus, right emergency ac
bus, right emergency dc bus, battery bus, and the battery charger when the
ADG ELEC switch is in the ON position (battery is charged by the battery
charger). There is no time limit of the ADG electrical power in this
configuration.
This arrangement will allow the battery and ADG to provide emergency electrical
power to the Captain's flight essential equipment during an all engines failed
situation, or it will allow the ADG to provide non-time limited emergency power
to the Captain's and First Officer's flight essential equipment during an all
generators failed situation.
During an all engines failed situation, or an all generators failed situation, the
battery alone (without the ADG) will supply approximately 15 minutes of
emergency electrical power to the Captain's flight essential equipment.
EIS Test Display
All ELECTRICAL synoptic data digits will be crossed out with amber Xs when
all of the conditions are met as follows:
• The aircraft is on the ground.
• The aircraft is operational.
• The ANNUN LT TEST button on the forward overhead panel is pushed.
• The ELECTRICAL synoptic has been selected to appear on the SD.
October 02, 2006
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