A. Ceiling Lights (Continued)

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B. Window Lights

TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
One (or two adjacent) window lights inoperative All window lights inoperative  Failed lamp or ballast Failed relay transformer or switch  Replace ballast fuse (if installed). If not OK, relamp. If not OK, replace ballast Replace in order: Relay R121 in J5 XFMR T133 in J5 Window light switch on attendant’s panel 

C. Entry Lights D. Reading Lights
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Dim  Failed lamp or switch, or  Check if both forward and aft  Relamp 
(incandescent)  external power dc  dim entry lights failed to 
entry light  sensing relay  operate. 
inoperative with attendants switch set to DIM  If one faulty, relamp; if not OK, replace switch on attendant’s panel.  Replace switch 
If both faulty, replace external power dc sensing relay in P6.  Replace EP DC sensing relay R47 in P6 (WDM  33-29-01) 
Bright entry lights  Failed lamp, ballast,  Relamp. If not OK, 
(fluorescent)  XFMR, or switch  replace in order: 
inoperative  Ballast Transformer switch (WDM 33-29-01) 

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TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Reading light inoperative  Failed lamp, switch, or light assembly  Relamp. If not OK, replace switch 

E. Passenger Information Signs E. Passenger Information Signs (Continued) F. Lavatory Lights
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
One sign does not illuminate properly  Lamp or sign  Relamp; if not OK, replace sign assembly 
Either all FASTEN SEAT BELTS or all NO SMOKING signs inoperative, switch in ON position  Faulty switch or relay  Replace FASTEN BELTS or NO SMOKING switch on P5 pilots overhead panel. If signs illuminate, switch was faulty. If still inoperative, relay on P6 load control center is probably faulty.  Replace switch. Replace relay 

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TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
ALL FASTEN  Faulty pilots switch.  Replace FASTEN BELTS  Replace pilots 
SEAT BELT signs  Faulty relay, flap limit  switch on P5 pilots overhead  switch. 
inoperative, switch in AUTO position  switch or landing gear lever switch  panel. If signs illuminate switch was faulty. If still inoperative, replace relay on P6 load control center. If still inoperative, the T.E. flaps up/not up limit switch in main wheel well or the landing gear  Replace relay. Replace flap limit switch. Replace landing gear lever switch. 
lever down switch on the P2 panel are either or both probably faulty. 
All NO SMOKING  Faulty pilots switch.  Replace NO SMOKING  Replace pilots 
signs inoperative,  Faulty relay or landing  switch on P5 pilots overhead  switch. 
switch in AUTO position  gear lever switch  panel. If signs illuminate, switch was faulty. If still inoperative, replace relay on P6 load control center. If still inoperative, landing gear lever down switch on P2 panel is probably faulty.  Replace relay. Replace landing gear lever switch. 

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TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Lavatory dome light inoperative Lavatory occupied light inoperative Lavatory fluorescent mirror lights inoperative  Failed lamp Failed lamp or lavatory door bolt switch Failed lamp, ballast, EMI filter, or door bolt switch  --------------- Relamp Relamp. If not OK, replace lavatory door bolt switch Replace in order: Lamp Ballast EMI filter Door bolt switch 

G. Galley Lights H. Airstairs Lights PASSENGER COMPARTMENT ILLUMINATION - DESCRIPTION AND OPERATION
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
Galley light inoperative  Failed switch  ----- Replace switch 
Galley light dim  Failed lamp, ballast or switch  ----- Replace in order: Lamp Ballast Switch 
　
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