3. System Description
__________________
 **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299,
 (Ref. Fig. 002)
 **ON A/C 301-399,
 (Ref. Fig. 002A)

R **ON A/C 401-499,
R (Ref. Fig. 002B)
 **ON A/C ALL
 The lavatory lighting system has:
 -
a fluorescent lamp with a ballast unit installed above the lavatory door in each lavatory.

 -
a halogen lamp installed adjacent to the lavatory mirror in each lavatory.

 -
a microswitch installed at each lavatory door frame. The microswitch is part of the lavatory lighted signs system (Ref. 33-26-00).

 4.
 Power Supply

____________ The 115VAC from the busbar 214XP supplies the fluorescent lamps through the circuit breaker 1LQ and the power control relay 2LQ. The pushbutton membrane-switch POWER LAV, on the forward attendant panel 120RH, controls the power supply for the fluorescent lamps. The 28VDC from the busbar 208PP supplies the halogen lamps through the circuit breakers 1WJ, 11WJ and the door microswitches (Ref. 33-26-00).

 5.
 Operation

_________
 A. Component Operation The system is supplied with power when the busbars are energized and the circuit breakers 1LQ, 1WJ and 11WJ are closed. With the door microswitch in the FREE position the halogen lamp is disconnected from the 28VDC. The DIM 1 (50 %) input of the ballast unit is supplied with 28VDC.
 (1) When the switch POWER LAV on the forward attendant panel 120RH is pushed relay 2LQ energizes. Each lavatory ballast unit is supplied with 115VAC and the fluorescent lamp comes on with 50 % intensity.

 Lavatory Lighting - Schematic
 Figure 002

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 33-24-00Page 7 1201-299, 1Aug 01/05 1 1 1CES 1

 Lavatory Lighting - Schematic
 Figure 002A 
R 1EFF :  301-399,  1  33-24-00 Page 8 
1  1  Aug 01/05
 1  1
 1CES  1

R Lavatory Lighting - Schematic R Figure 002B
 1EFF : 401-499, 1 33-24-00Page 9/10 1 1 Aug 01/05 1 1 1CES

 (2)
 When the lavatory door is locked, the related door microswitch changes over to the ENGAGED position and the halogen lamp is supplied with 28VDC. The 28VDC is disconnected from the DIM 1 input of the ballast unit and the fluorescent lamp illuminates with 100 % intensity.

 (3)
 The integral light under the POWER LAV membrane switch foil (on the forward attendant panel 120RH) comes on when the membrane switch is initially pushed. When the membrane switch is pushed again, the fluorescent lamps in the lavatory go off. Also the integral light under the POWER LAV membrane switch foil goes off.

 (4)
 All fluorescent lights go off when the membrane switch LIGHT MAIN OFF on the forward attendant panel 120RH is pushed. Other systems are also switched off with this membrane switch at the same time.

 LAVATORY LIGHTING - ADJUSTMENT/TEST
___________________________________ TASK 33-24-00-710-001 Operational Test of the Lavatory Lighting LQ WARNING : MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE
_______ YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT.
 1.
 Reason for the Job

__________________
 To make sure that the lavatory lighting operates correctly.

 2.
 Job Set-up Information

______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
23-73-00-861-001  Energize the Cabin Intercommunication Data System (CIDS) 23-73-00-862-001 De-energize the Cabin Intercommunication Data System (CIDS) 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power
 3. Job Set-up
__________ Subtask 33-24-00-861-050
 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
 1EFF : ALL 1 33-24-00Page 501 1 1 Aug 01/05R 1 1 1CES 1

R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 Subtask 33-24-00-865-050
 B. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL SERVICE IDENT. LOCATION -------------------------------------------------------------------------------2000VU LIGHT - LAV 1LQ J01 2000VU LAV FWD & MID - OCCUPIED 1WJ F01 2001VU LAVATORY AFT OCCUPIED 11WJ B04 
　
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