MD-11 Flight Crew Operations Manual
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Electrical -
Controls and Displays
Elec.30.2
3/1 OFF - Gen relay, aux pwr relay, bus tie relay and dc tie 3 are open. Gen
channel 3 is unpowered, ECON mode and galley bus 3 is unpowered. Pack 1
and air supply 1 turn off and EIS CRTs go full bright.
2/3 OFF - Gen relay, aux pwr relay, bus tie relay, and dc tie 3 return to state
prior to SMOKE switch operation. When gen channel 3 is again powered, gen
channel 2 becomes unpowered. Galley bus 3 is again powered and galley bus
2 is unpowered. Gen relay, aux pwr relay, and bus tie relay 2 are open. Pack
1 and air supply 1 are reinstated. Pack 3 and air supply 3 are turned off.
1/2 OFF - Gen relay, aux pwr relay, bus tie relay 2 return to state prior to
SMOKE switch operation. When gen channel 2 is again powered, gen
channel 1 becomes unpowered. Galley bus 2 is again powered and galley bus
1 is unpowered. Gen relay, aux pwr relay, bus tie relay, and dc tie 1 are open.
Automatic transfer or emer pwr is inhibited. Pack 3 and air supply 3 are
reinstated. Pack 2 and air supply 2 are turned off.
NORM - Gen relay, aux pwr relay, bus tie relay, and dc tie 1 return to state
prior to SMOKE switch operation. Turns on pack 2 and air supply 2. Returns
ECON mode and galley bus 1 to normal operation. EIS CRTs return to auto
brightness control.
3. CAB BUS OFF Switch - amber
This switch is a guarded alternate action switch that opens the RCCB bus
feeds to the following buses when the system is in auto or manual:
• Cabin AC buses 1 and 3.
• Cabin AC ground service bus.
• Cargo loading bus.
With the CAB BUS OFF light illuminated, power is removed from all cabin
buses, including galley buses.
4. ADG ELEC ON Switch - amber
This switch is an alternate action switch that is used after ADG deployment.
Operation is the same in auto or manual.
OFF - electrical power is supplied to the aux hydraulic pump. If emergency
power is on, power will also be supplied to the left emergency ac bus.
ON - electrical power is supplied to the right and left emergency ac buses,
right and left emergency dc buses, battery charger, and battery bus.
September 03, 2007
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