(d)
 BITE test initialization The CFDS transmits respective signals via the director and DEU type B to the components of the Vacuum Toilet System, if a BITE test is initiated via the MCDU. The results of the test are transmitted via DEU type B to the director, which sends the results to the CFDS. The results are indicated on the MCDU.

R 1EFF : 106-149, 301-399, 401-499, 1 23-73-00Page A57 1 1 Config-2 Aug 01/05 1 1 1CES 1

 Vacuum System Control Function - Block Diagram
 Figure 054

 1EFF : 301-399, 1 23-73-00Page A58 1 1 Config-2 Aug 01/05R 1 1 1CES 1

R  **ON A/C 106-149, 401-499,
 (19) Doors and Escape Slides Pressure Monitoring
 (a) General 
R  **ON A/C 106-149,
 (Ref. Fig. 055) 
R  **ON A/C 401-499, 
R  (Ref. Fig. 055B) 
R  **ON A/C 106-149, 401-499,
 The DOORS/SLIDES page of the FAP shows the status of each door (open/closed) and slide (armed/disarmed) and the status of each door bottle and slide bottle (pressure). (Ref. 25-62-00) (Ref. 52-71-00).
 (b) Signal transmission The pressure sensors send the signals via the related DEU type B to the director. The status of the doors and slides is transmitted from the System Data Acquisition Concentrator (SDAC) to the director. The director transmits the signals to the FAP where all information is indicated on the DOORS/SLIDES page.
 **ON A/C 301-399,
 (19) Doors and Escape Slides Monitoring (Ref. Fig. 056)
 (a) General (Ref. Fig. 055A) The DOORS/SLIDES page of the FAP shows the status of each door (open/closed) and slide (armed/disarmed). (Ref. 25-62-00) (Ref. 52-71-00). 

R 1EFF : 106-149, 301-399, 401-499, 1 23-73-00Page A59 1 1 Config-2 Aug 01/05 1 1 1CES 1

 FAP - Doors/Slides Page (only Doors/Slides related buttons labeled) - Example

 Figure 055 
R 1EFF :  106-149,  1  23-73-00 Page A60 
1  1  Config-2 Aug 01/05
 1  1
 1CES  1

 FAP - Doors/Slides Page (only Doors/Slides related buttons labeled) - Example

 Figure 055A 
R 1EFF :  301-399,  1  23-73-00 Page A61 
1  1  Config-2 Aug 01/05
 1  1
 1CES  1

R FAP - Doors/Slides Page (only Doors/Slides related buttons labeled) - Example

R  Figure 055B 
R 1EFF :  401-499,  1  23-73-00 Page A62 
1  1  Config-2 Aug 01/05
 1  1
 1CES  1

 Doors and Escape-Slides Pressure Monitoring - Block Diagram
 Figure 056

R 1EFF : 301-399, 1 23-73-00Page A63 1 1 Config-2 Aug 01/05 1 1 1CES 1

 (b) Signal transmission The status of the slides is transmitted from the System Data Acquisition Concentrator (SDAC) to the director. The director transmits the signals to the FAP where all information is indicated on the DOORS/SLIDES page.

R **ON A/C 106-149, 301-399, 401-499,
 (20) Emergency Power Supply Unit (EPSU)
 **ON A/C 301-399,
 (Ref. Fig. 057)

R **ON A/C 106-149, 301-399, 401-499,
 (a)
 General The EPSU supplies electrical power to the emergency lighting system. (Ref. 33-51-00)

 (b)
 BITE test initialisation The Centralized Fault Display System (CFDS) transmits respective signals via director and DEU type B to the EPSU, if one of the following BITE test is initiated via the MCDU:

 -System test,

 -Battery capacity test.
 The EPSU does the test. When the test is finished, the results
 are transmitted via DEU type B to the director which sends the
 results to the CFDS. The test results are indicated on the MCDU.

 (21) Drain Mast Control Unit (DMCU)
 **ON A/C 301-399,
 (Ref. Fig. 058)

R **ON A/C 106-149, 301-399, 401-499,
 (a) General The DMCUs monitor and control the drainmast heaters. There is a separate DMCU for every heater.
R 1EFF : 106-149, 301-399, 401-499, 1 23-73-00Page A64 1 1 Config-2 Aug 01/05 1 1 1CES 1

 Emergency Power Supply - Block Diagram
 Figure 057

R 1EFF : 301-399, 1 23-73-00Page A65 1 1 Config-2 Aug 01/05 1 1 1CES 1

 Drain Mast Control - Block Diagram
 Figure 058

R 1EFF : 301-399, 1 23-73-00Page A66 1 1 Config-2 Aug 01/05 1 1 1CES 1

 (b)
 Signal transmission The drainmast system status is transmitted from the DMCU via DEU type B to the director. In case of a failure, the director sends the signal to the FAP and to the CFDS. On the FAP the CIDS Info light comes on to indicate that there is a new failure message. Via the CFDS the failure message shows on the MCDU.
　
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