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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
5. Door (Sill) Lights
__________________
A. Two emergency lights are installed in the upper frame of the passenger door on the main deck. These lights give lighting to the doorway.
6. Exit Signs
__________
A. In an electrical power failure, the exit signs show the location of the doors to the passengers and the crew.
(1)
There is an exit sign above each door.
(2)
There are also exit signs which point to the doors. These signs are installed near the ceiling above or adjacent to the aisle.
B. The lamps in the electrically lighted exit signs operate with the 6 volts of electrical power from the emergency light batteries.
7. Pilot's Switch
______________
A. The pilot's switch for the emergency lights is on the overhead panel, P5. This switch gives the primary control of the emergency lights.
(1)
In the on position, the emergency lights are on.
(a) An >EMER LIGHTS advisory message shows on the main EICAS display.
(2)
In the armed position, the emergency lights come on automatically if there is an electrical power failure. The emergency lights can be operated manually with the attendant's switch.
(a) An >EMER LIGHTS advisory message shows on the main EICAS display if the attendant's switch is used to make the emergency lights come on.
(3)
In the off position, the emergency lights are off unless the attendant's switch is set to the on position.
(a) An >EMER LIGHTS advisory message shows on the main EICAS display.
8. Attendant's Switch
__________________
A. The attendant's emergency lights switch is on the attendant's panel in the passenger compartment on the upper deck. This switch gives the secondary control of the emergency lights.
(1)
In the on position, the emergency lights are on.
(a) You cannot make the emergency lights go off with the pilot's switch. You must first set the attendant's switch to the off position.
(2)
In the normal position, the emergency lights come on automatically if there is an electrical power failure.
(a) The pilot's switch must be set to the armed position.
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