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 B. Control and Indication The lavatory and galley extraction fan 1HU is continuously monitored by the air conditioning system controllers (ACSC) 47HH (57HH) (Ref. 21-61-00). If an overheat of the lavatory and galley extraction fan 1HU occurs, the thermo switches of the fan stop the electrical power supply through the power relay 2HU. The fan stops and the indicating relay 4HU opens. The indicating relay 4HU gives a signal to the ACSC 47HH (57HH) (Ref. 21-63-00). The ACSC gives a signal to the Electronic Instrument System (EIS) (Ref. 31-60-00) and to the Centralized Fault-Display System (CFDS) (Ref. 31-30-00).
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 LAVATORY/GALLEY VENTILATION - SERVICING
_______________________________________
 TASK 21-23-00-600-001
 Replacement of the Lavatory Air-Extraction Filter
 1.
 Reason for the Job

__________________
 Refer to the MPD TASK: 212300-02

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE  QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific  soft-bristled brush
 B. Expendable Parts
 -------------------------------------------------------------------------------
FIG.ITEM |DESIGNATION  |IPC-CSN
 -------------------------------------------------------------------------------
4 fleece 21-23-04 30H-070 4 fleece 21-23-04 30M-070 R 4 fleece 21-23-04 33J-070
 C. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
24-42-00-861-001  Energize the Ground Service Network from the External Power 24-42-00-862-001 De-energize the Ground Service Network Supplied from the External Power 21-23-00-991-002 Fig. 301
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 3. Job Set-up
__________
 Subtask 21-23-00-861-051

 A. Energize the ground service network
 (Ref. TASK 24-42-00-861-001)

 4. Procedure
_________
 (Ref. Fig. 301/TASK 21-23-00-991-002)
 Subtask 21-23-00-960-050
 A. Replacement of the Lavatory Air-Extraction Filter
 (1)
 Remove the screws (3) and the louver (2).

 (2)
 Remove and discard the fleece (4).

 (3)
 Remove the grill (5) and clean it with a soft-bristled brush.

 (4)
 Put the grill (5) in position in the housing (1).

 (5)
 Put the new fleece (4) in position in the housing (1). Refer to:

 -fleece (4) or, R - fleece (4) or, R - fleece (4).
 (6) Put the louver (2) in the correct position and install the screws (3).
 5. Close-up
________
 Subtask 21-23-00-862-051

 A. De-energize the ground service network
 (Ref. TASK 24-42-00-862-001)

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 Lavatory Air-Extraction Filter
 Figure 301/TASK 21-23-00-991-002

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 LAVATORY/GALLEY VENTILATION - DEACTIVATION/REACTIVATION
_______________________________________________________ TASK 21-23-00-040-001 Deactivation of the Lavatory/Galley Extraction Fan 1HU
 1. Reason for the Job
__________________
 Refer to the MMEL TASK: 21-23-01
 AIR CONDITIONING
 Lavatory and Galley Extraction Fan
 (FAA only)

 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific  circuit breaker(s) safety clip(s)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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
　
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