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C.  Fluorescent mirror lights provide added illumination. On the ground with external power on the airplane the lights are on when the door is unlocked. If the No. 1 115-volt ac bus is energized, the lights will be on when the door is locked. Airborne the lights are off except when the door is locked (Fig. 7).
9.  Galley Lights
A.  Fluorescent lights for the galleys are located on the ceiling above the galley entryway (Fig. 1). Power for the lights is from the 115-volt ac ground service bus through an intensity control on the galley. Dim or bright is determined by lighting one or two lamps (Fig. 8).
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527  Passenger Reading Lights Schematic 
Nov 15/71  Figure 5  33-21-01 
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Passenger Information Signs Simplified Schematic  527 
33-21-01  Figure 6  Aug 15/72 
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514  Lavatory Lights Schematic 
Nov 01/75  Figure 7  33-21-01 
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10.  Attendant's Work Lights
A.  The forward attendant's work light is located on the passenger cabin left sidewall above the forward entry door and is controlled by a switch on the forward attendant's panel (Fig. 1).
B.  On Standard Passenger Airplanes, an aft attendant's work light is located overhead in the lowered ceiling near the galley light and is controlled by a switch on the aft attendant's panel (Fig. 1).
C. Power for the work lights is 28 volts ac from load control center P18.
11. Airstair Lights
A.  Two tread lights are mounted under the forward lower edge of each step of the airstairs. The lamps are powered by 28 volts through circuit breakers on the P6 panel.
B.  The AIRSTAIR three-position toggle switch on the adjacent attendant's panel provides control. The three switch positions are ON, OFF, and AUTO. The ON switch turns the airstairs lights on independent of airstair position. The OF F position disables the circuit. With the switch set to AUTO, an airstair extend limit switch is connected in series with the switch on the attendants' panel. The extend limit switch will turn the airstair lights on whenever the airstairs are fully extended and turn the lights off when the airstairs are retracted. (See figure 9.)
12  Main Cargo Door Floodlights (Passenger/Cargo Convertible Airplanes)
A.  There are four cargo door floodlights in the main passenger cabin ceiling and a pair of threshold lights at the main cargo door which are controlled by the cargo door lights switch on the main cargo door control panel. Power to the cargo door and threshold lights is only available when the cargo door is open, thus energizing the cargo door floodlights relay.
B.  Power for these lights and relay is 28 volts ac from the 28-volt ac ground service bus through the MAIN CARGO DOOR FLOOD LIGHTS circuit breaker on panel P18.
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527  Galley Lights Schematic 
Nov 15/71  Figure 8  33-21-01 
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K83397
Airstairs Lights Simplified Schematic  533 
33-21-01  Figure 9  Aug 15/72 
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PASSENGER COMPARTMENT LIGHTING – TROUBLE SHOOTING
1.  General
A.  Trouble shooting the passenger compartment lighting is accomplished independent of any other tests or functions. Trouble shooting requires that power is available and appropriate circuit breakers closed.
B.  Trouble shooting procedures are based on the assumption that wiring is OK and electrical power available. If corrective action in procedure does not correct problem, check wiring using wiring diagram.
2.  Passenger Compartment Lighting Trouble Shooting Chart
A.  Ceiling Lights
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
One night light inoperative  Failed lamp or lamp holder assembly  Relamp or replace lamp holder 

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