(12)
 Make sure that the electrical connectors are clean and in the correct condition.

 (13)
 Connect the electrical connector (14).

 (14)
 Make sure that the work area is clean and clear of tool(s) and other items.

 Subtask 21-21-51-710-050
 B. Do the operational test of the cabin recirculation fans 14HG (15HG). (Ref. TASK 21-21-00-710-001)
 5. Close-up
________ Subtask 21-21-51-410-050
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panel (Ref. TASK 25-54-12-400-001).

 (a)
 FOR 15HG

 -131PW,

 (b)
 FOR 14HG

 -132PW.

 (3)
 Remove the access platform(s).

 (4)
 Close the FWD cargo-compartment door 865 (Ref. TASK 52-30-00-860-002).

 (5)
 Remove the warning notice(s).

 Subtask 21-21-51-865-052
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): FOR 15HG 1HG, 2HG. FOR 14HG 3HG, 11HG.
 Subtask 21-21-51-862-050
 C. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002) LAVATORY/GALLEY VENTILATION - DESCRIPTION AND OPERATION

_______________________________________________________
 1. General
_______
 A. Lavatory/Galley Ventilation The lavatory/galley ventilation system makes sure that the lavatories and galleys have a flow of temperature controlled and conditioned air. Air flows from the cabin into the lavatories and galleys. Air also flows into the lavatories from the cabin air distribution and recirculation system through individual air outlets. The air flows from the lavatories and galleys into an extraction duct in the area of the outflow valve and then out of the aircraft. An extraction fan gives the necessary airflow.
 2. Component Location
__________________
 **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 (Ref. Fig. 001)

R **ON A/C 151-199, 401-499,
 (Ref. Fig. 001A)
 **ON A/C ALL
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------1HU FAN-EXTRACTION 162DW 172 826 21-23-51
 3. System Description
__________________
 **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 (Ref. Fig. 001)
R **ON A/C 151-199, 401-499,
 (Ref. Fig. 001A)

 Lavatory and Galley Ventilation System
 Figure 001

R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 21-23-00Page 2 1301-399, 1May 01/05 1 1 1CES 1

 Lavatory and Galley Ventilation System
 Figure 001A

R 1EFF : 151-199, 401-499, 1 21-23-00Page 3 1 1 Aug 01/05 1 1 1CES 1

R  **ON A/C ALL 
R  A. Lavatory and Galley Air Supply 
R  (1) Compartment Ventilation 
R  The largest quantity of air for ventilation of the lavatories and 
R  galleys comes from the cabin. Extraction causes the air to flow from 
R  the cabin into the lavatories and galleys. The air flows into the 
R  lavatories through grilles in the door and into the galleys through 
R  grilles and filters which are installed in the galley walls and the 
R  ceiling. 
R  (2) Individual Ventilation 
R  A small quantity of air for ventilation of the lavatories flows from 
R  individual air outlets. Conditioned air from the cabin air 
R  distribution and recirculation system (Ref. 21-21-00) flows into the 
R  supply ducts of the lavatory/galley ventilation system. The supply 
R  ducts are installed in the ceiling area of the cabin. The air flows 
R  from the supply ducts into each lavatory through an individual air 
R  outlet. There are also supply ducts to the galleys. They are only 
R  connected where it is necessary for customer requirements. 
R  B. Lavatory and Galley Extraction System 
R  (1) Extraction Fan 1HU 
R  The extraction fan 1HU removes air from the lavatories and the 
R  galleys through a duct which is installed above the cabin ceiling. 
R  The air flows through filters into the duct. This duct extends the 
R  length of the cabin from the FWD utility area to the left-hand AFT 
　
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