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available on SN 1467 and subsequent through the use of a second set of
emergency batteries. If the main entrance door is open and the EMERG
POWER ARM switchlight (cockpit overhead panel) has been previously
been selected to ARM, activation of the emergency batteries will allow
emergency batteries No. 3 and 4 to automatically power the interior
emergency lighting and main entrance door emergency lighting.
D. Emergency Lighting Power (Airplanes 1000 Through 1466):
Two emergency batteries, one forward and one aft, make up the
emergency power system. The forward emergency battery is located in the
right radio rack. The aft emergency battery is located in the tail
compartment at fuselage station 680. The batteries are continually charged
by the Essential DC bus. Each of the batteries powers three emergency
buses: the forward battery powers 1A, 1B and 1C, while the aft battery
powers 2A, 2B and 2C. Basic electrical equipment and instruments
necessary for ßight are on the emergency buses: communication and
navigation radios, clocks, landing gear and ßap position indicators, etc.
(For a complete discussion of the emergency power system, see the
electrical section of this manual.) All of the external emergency exit lights
are wired to both batteries to ensure that the exit lights will be powered in
the event of a single battery failure or damage to either the front or rear of
the airplane.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-33-00
Page 37
May 30/02
Revision 7
E. Emergency Lighting Power (Airplane 1467 and Subsequent):
Four emergency battery units, two forward and two aft, make up the
emergency power system. The forward emergency batteries (No. 1 and 3)
are located in the right radio rack. The aft emergency batteries (No. 2 and
4) are located in the tail compartment at fuselage station 680. The batteries
are continually charged by the Essential DC bus.
In the event of Essential DC power loss, batteries 1 and 2 will automatically
power the Emergency buses, wing leading edge evacuation lighting and
external overwing evacuation lighting. Batteries 3 and 4 will automatically
power the interior emergency lighting and main entrance door emergency
lighting (if the door is open).
Each set of batteries powers three emergency buses: the forward batteries
power 1A, 1B and 1C, while the aft batteries power 2A, 2B and 2C. Basic
electrical equipment and instruments necessary for ßight are on the
emergency buses: communication and navigation radios, clocks, landing
gear and ßap position indicators, etc. (For a complete discussion of the
emergency power system, see the electrical section of this manual.) All of
the external emergency exit lights are wired to both sets of batteries to
ensure that the exit lights will be powered in the event of a single battery
failure or damage to either the front or rear of the airplane.
F. Emergency Power Control Switches:
(See Figure 9 and Figure 10.)
The forward and aft emergency batteries are controlled by three guarded
momentary action switches located in the EMERGENCY POWER section
of the cockpit overhead panel. The switches are labeled ON, ARM, and
OFF. Selections made with the switches result in the following operations:
(1) Switch ON:
NOTE:
Asterisk (*) items below apply to SN 1467 and
subsequent.
• Forward and aft emergency lighting batteries are activated
• Overwing and underwing exit lights illuminate
• Legend Ò1 ON / 2 ON / 3 ON* / 4 ON*Ó is illuminated in switch
capsule
• A blue E BATT 1-2-3*-4* DISCH message is displayed on the
Crew Alerting System (CAS)
(2) Switch ARMED:
When ARM is selected, all legends in the emergency power control
switches are extinguished and the system monitors the Essential
DC bus. If Essential DC bus power falls below 20V or is lost, the
emergency power system is activated.
(3) Switch OFF:
OPERATING MANUAL
2A-33-00 PRODUCTION AIRCRAFT SYSTEMS
Page 38
May 30/02
Revision 7
When OFF is selected and Essential DC bus voltage is above 20V,
the emergency power system is disabled.
NOTE:
The emergency power system can only be selected
OFF if the Essential DC bus is above 20V. To prevent
emergency battery depletion, it is important to select
the system OFF prior to selecting the left and right
main airplane batteries OFF.
(4) Impact Switch:
Two impact switches, one adjacent to each battery, will activate the
emergency batteries if a force of 2.5 GÕs is detected. Battery
activation by the impact switches is independent of emergency
　
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