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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