MD-11 Flight Crew Operations Manual
k
Electrical -
Controls and Displays
Elec.30.3
5. APU PWR ON/AVAIL Switch - blue/green
The APU PWR switch is a momentary contact switch that starts the APU
from the ELEC panel and supplies electrical power to any generator bus.
Switch operation is the same in manual or auto mode. Pushing the APU PWR
switch starts the APU. If the APU was started by the APU START/STOP
switch, it cannot be stopped with this switch.
When this switch is used to start the APU, AVAIL will flash green until APU
reaches 95 percent N2. AVAIL will illuminate steadily when APU power is
correct. If APU power is not correct, AVAIL light will extinguish.
ON illuminates blue when any APR is closed.
6. EXT PWR ON/AVAIL Switch - blue/green
The EXT PWR switch is a momentary contact switch that supplies external
power to the main aircraft buses when the system is in the auto or manual
mode.
AVAIL illuminates green when external power is available. Main external
power plug must be correctly seated to receptacle and correct signal must be
received by the electrical power control unit.
ON illuminates blue when the bus tie relay-external power is closed. If an
incorrect signal is received by the electrical power control unit, power
receptacle is improperly seated, or switch is pushed while in the ON position,
external power is disconnected and ON extinguishes.
7. GLY EXT PWR ON/AVAIL Switch - blue/green
The GLY EXT PWR switch is a momentary contact switch that supplies
external power to the galley buses when the system is in the auto or manual
mode.
The GLY EXT PWR switch is a momentary contact switch that supplies
external power to the galley buses when the system is in the auto or manual
mode. This switch is only operative for galley 2.
AVAIL illuminates green when galley external power is available. Galley
external power plug must be correctly seated to receptacle and correct signal
must be received by electrical power control unit.
ON illuminates blue when galley external power is selected on. If an incorrect
signal is received by the electrical power control unit, power receptacle in
improperly seated, or switch is pushed while in the ON position, galley
external power is disconnected and ON extinguishes.
October 02, 2006
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