(f) Horn shut off Pushing the HORN SHUT OFF button in the cockpit cancels the chime in the cockpit.
 (16) Potable Water Indication
 (Ref. Fig. 051)

 (a)
 General The potable water indication system shows the filling level of the water tank on the FAP.

 (b)
 Operation

 **ON A/C 106-149,
 (Ref. Fig. 052)
 **ON A/C 301-399,
 (Ref. Fig. 052A)

R **ON A/C 106-149, 301-399, 401-499,
 The indication is done on the WATER/WASTE page of the FAP. (Ref. 38-13-00)
 (c) Signal transmission The water quantity is transmitted from the Liquid Level Transmitter (LLT) via DEU type B to the director. The director sends the signal to the FAP where the actual quantity is indicated.
 (17) Waste quantity indication
 **ON A/C 301-399,
 (Ref. Fig. 053)
R 1EFF : 106-149, 301-399, 401-499, 1 23-73-00Page A51 1 1 Config-2 Aug 01/05 1 1 1CES 1

 Potable Water Indication - Block Diagram
 Figure 051

R 1EFF : 106-149, 301-399, 401-499, 1 23-73-00Page A52 1 1 Config-2 Aug 01/05 1 1 1CES 1

 FAP - Water/Waste Page (only Water/Waste related buttons labeled) - Example

 Figure 052 
R 1EFF :  106-149,  1  23-73-00 Page A53 
1  1  Config-2 Aug 01/05
 1  1
 1CES  1

 FAP - Water/Waste Page (only Water/Waste related buttons labeled) - Example

 Figure 052A 
R 1EFF :  301-399,  1  23-73-00 Page A54 
1  1  Config-2 Aug 01/05
 1  1
 1CES  1

 Waste Indication - Block Diagram
 Figure 053

 1EFF : 301-399, 1 23-73-00Page A55 1 1 Config-2 Aug 01/05R 1 1 1CES 1

R **ON A/C 106-149, 301-399, 401-499,
 (a)
 General The waste quantity indication system shows the filling level of the waste tanks on the FAP. Additionally fault, system and inoperative messages for the vacuum lavatories are indicated on the FAP.

 (b)
 Operation

 **ON A/C 106-149,
 (Ref. Fig. 052)
 **ON A/C 301-399,
 (Ref. Fig. 052A)

R **ON A/C 106-149, 301-399, 401-499,
 The operation and indication is performed via the WATER/WASTE
 page of the FAP.
 (Ref. 38-30-00)

 (c)
 Signal transmission The water quantity is transmitted from the Liquid Level Sensor (LLS) and the Liquid Level Transmitter (LLT) via DEU type B to the director. The director sends the signal to the FAP where the actual quantity is indicated. If the Liquid Level Sensor (LLS) indicates a failure, the respective signal is sent via DEU type B to the director. The director transmits the signal to the FAP where a related message indicates the faulty lavatory. The WATER/WASTE page comes up automatically, if a new failure occurs and no other system page is displayed.

 (d)
 Visual and acoustical indication In case of a rinse valve failure the director sends signals to the DEU type B and to the DEU type A. The DEU type B switches on the respective ACP light segment and the related message is shown on the AIP. The DEU type A activates a chime directly or via PISA in the cabin and the respective lavatory call light comes on.

R 1EFF : 106-149, 301-399, 401-499, 1 23-73-00Page A56 1 1 Config-2 Aug 01/05 1 1 1CES 1

 (18) Vacuum System Control Function (VSCF)
 **ON A/C 301-399,
 (Ref. Fig. 054)

R **ON A/C 106-149, 301-399, 401-499,
 (a)
 General The Vacuum System Control Function is an extension of the CIDS operation software. It monitors and controls the Vacuum Toilet System (Ref. 38-31-00). This includes the following functions:

 -Control of toilet assemblies
 -Monitoring of waste tank level
 -Control of vacuum generator
 -Servicing procedure
 -Communication with other systems
 -BITE-monitoring of vacuum system components
 -C/B monitoring

 (b)
 Operation The VSCF receives signals from several components of the Vacuum Toilet System that report the current status of the Vacuum Toilet System. The VSCF examines these signals and then starts the necessary actions. Detected faults are either sent to the FAP and displayed there or they are sent to the CFDS for display on the MCDU. It depends on the quality of the fault on which system the fault is displayed.

 (c)
 Signal transmission Most of the signals monitored by the VSCF are transmitted from the related components via DEU type B to the director. When the signals have been processed, the director sends a signal to the FAP, where the related messages are displayed. The director also sends a signal to the CFDS to show failure messages on the MCDU. Also, the director sends signals to the related components of the Vacuum Toilet System to start the necessary actions.
　
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