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AIRCRAFT GENERAL
737 Sec. 6.1 Page 69
Flight Manual Continental Rev. 11/15/02 #41
Lights Test Switch
Certain flight deck indicator lights may be tested with a switch on the forward
instrument panel. The switch has three positions:
TEST - The majority of the flight deck indicators will illuminate “bright”.
- The master caution system will not “recall” with the switch in the
TEST position. All segments of the displays on the Autopilot
Flight Director Mode Control Panel constantly flash.
BRT - Light intensity is bright.
DIM - Light intensity is dim for the majority of the indicator lights.
Note: Marker Beacon lights, NAV/COMM Radio Frequencies, Transponder
Code, Clock LCD, Auto Throttle / Auto Pilot annunciator, all fire
related lights, and MCP Panel ON lights do not test in TEST position.
Passenger Cabin
Passenger cabin lighting is accomplished by use of white incandescent lights
and white fluorescent lights. General cabin illumination is provided by window
lights, ceiling lights, and entry lights. These are supplemented by reading lights
in the passenger service units, lavatory lights and separately controlled lights in
the galley areas.
Power Sources
Flight deck and passenger cabin lights are divided between the two main AC
busses so that failure of either bus will result in only partial loss of lighting.
Hot Battery Bus
With the battery switch OFF, and external power connected, the dim entry lights
will be illuminated from the hot battery bus. The fluorescent mirror lights in the
lavatories can also be illuminated from the 115 VAC ground service bus.
AIRCRAFT GENERAL
Sec. 6.1 Page 70 737
Rev. 11/15/02 #41 Continental Flight Manual
Battery Bus
Loss of all AC power will leave only the following lights powered from the
battery bus:
Flight Deck Lights:
· Standby compass light
· White dome lights
· Background instrument flood lights
· Selected system information and warning lights
Passenger Cabin Lights:
· Lavatory dome light
Emergency Exit Lights:
· Emergency exit lights and signs are powered from separate emergency
power supplies installed in the passenger cabin.
Note: Failure of AC Transfer Bus No. 2 (TRANSFER BUS OFF light illuminated)
will automatically illuminate the background instrument floodlights at
a preset intensity.
Emergency Exit Lights
Clearly marked exit lights are located throughout the passenger cabin to indicate
the approved emergency exit routes. All of the lights are powered by individual
Nicad batteries with a charging, monitoring, and voltage regulator circuit.
Charging occurs with the switch OFF or ARMED with normal power on the
aircraft and the aft flight attendant panel switch NORMAL.
The system is controlled by a switch on the overhead panel. The switch has
three positions, OFF, ARMED and ON and is guarded to the ARMED position. With
the switch in the ARMED position, the emergency exit lights will normally be
extinguished. If electrical power to the 28 volt DC bus No. 1 fails or if AC
power has been turned off, the emergency exit lights illuminate automatically.
The emergency exit lights may also be illuminated by a switch on the aft
attendant’s panel. This switch has two positions, NORMAL and ON, and is
guarded to the NORMAL position.
AIRCRAFT GENERAL
737 Sec. 6.1 Page 71
Flight Manual Continental Rev. 11/15/02 #41
With the switch in the NORMAL position, the lights are controlled from the flight
deck. With the switch in the ON position, the cabin attendant may override the
flight deck controls and illuminate all the emergency lights. Control from this
panel is available in the event of failure of the automatic control.
The flight deck aft Dome Light contains a separate bulb that is powered by the
emergency lighting system to provide illumination for flight deck evacuation.
Interior emergency exit lights are located:
· In the bullnose of the stowage bins to illuminate the aisle;
· Over the entry / service and overwing emergency hatches to indicate the
door and hatch exits;
· In the ceiling to locate the exits and provide general illumination in the area
of the exits. Self-illuminating exit locator signs are installed at the forward,
the middle, and aft end of the passenger cabin.
Exterior emergency lights illuminate the escape slides. The fuselage installed
escape slide lights are adjacent to the forward and aft service and entry doors.
Two lights are also installed on the fuselage to illuminate the overwing escape
routes and ground contact area.
> EMERGENCY ESCAPE PATH AISLE LIGHTS
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