(4) Fault Handling
 (a)
 All detected system faults during current flight are continuously transmitted to the ARINC 429 data bus and are recorded. On request you can also call up the faults of previous flights (for first and second line maintenance) of the Line Replaceable Units LRU's. LRU's are:

 -
The toilet assembly (assemblies)

 -
The vacuum generator

 -
The vacuum system controller

 -
The altitude pressure switch

 -
The liquid level sensor.

 (b)
 All Shop Replaceable Units (SRU) defects data are recorded for third line maintenance (shop maintenance). This data is readable through the RS 232-C interface unit. The SRU are:

 -
The toilet assembly water valve, flush valve and flush control unit

 -
The liquid level transmitter

 -
The vacuum-system controller control-board.

 (c)
 Fault Data which the VSC transmits through ARINC 429 to CFDS:

 1_ Toilet Assembly Faults:
 - The water valve solenoid
 - The flush valve motor
 - The flush valve limit switch (open position)
 - The flush valve limit switch (closed position)
 - the flush control unit.
 NOTE : The identification letter for toilet location is____
 transmitted together with fault message for fault
 location.
 2_ The Vacuum System Controller Fault.
 3_ The Liquid Level Transmitter Fault.
 4_ The Altitude Pressure Switch.
 5_ The Vacuum Generator Overheat.
 6_ The Liquid Level Sensor Fault.
 7_  The Aircraft Power Supply 115 V/400 Hz.

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_
 9 No Data from CFDIU.
_
 (d)
 Not Applicable

 (e)
 Transmission Modes

 1 No Fault/Fault data is transmitted in two modes:
_
 -
The normal transmission mode

 -
The menu mode. The Normal Transmission Mode: In the normal transmission mode the VSC transmits continuously NO FAULT/FAULT data of the vacuum toilet system during flight. The CFDS receives these NO FAULT/FAULT data. Dependent on what failure the BITE of the VSC detects, the VSC will transmit the text data as follows:

 '383141  L A V  X,  (NOTE)
 '383134  V S C'
 '383162  L I Q D  L V L  X M T'
 '383169  A L T  P R E S S  S W'
 '383164  V A C U  G E N'
 '383163  L I Q D  L V L  S N S R'
 '383100  V A C U  G E N  S U P P L Y'
 '383100  L I Q D  L V L  X M T R /
 L I Q D  L V L  S N S R / V S C'
 '313234  'N O  C F D I U  D A T A.

 NOTE : The letter of the defective lavatory will be
____ transmitted together with the text.
 Menu Mode: When requested (during line maintenance) the VSC
 will first transmit the menu as follows:
 TOILET SYS
 <LAST LEG REPORT>
 <PREVIOUS LEGS REPORT>
 <LRU IDENTIFICATION>
 <TROUBLE SHOOTING DATA>
 <CLASS 3 FAULTS>
 <RETURN>
 If the operator selects an item of the menu, the VSC will
 transmit the data to the CFDS.

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 (f)
 Last Leg Report

 -
The DATE and Universal Time Co-ordinate (UTC) at which each fault occurred

 -
The identity of each faulty LRU, their related SRU, and the ATA chapter reference.

 (g)
 Previous Legs Report

 1 The PREVIOUS LEGS REPORT contains:
_
 -
The aircraft identification

 -
The DATE, UTC and flight leg count at which each fault occured

 -
The identity of each faulty LRU, their related SRU and the ATA chapter reference.

 (h) LRU Identification
 1 The LRU identification contains the part number of the VSC.
_
 (i) Faults Readable through RS232-C Interface Unit.
 1 The SRU function faults of the VSC readable through the
_ RS232-C interface unit for shop maintenance are:
 -
The aircraft power supply 115 V/400 Hz

 -
The analog inputs

 -
The analog outputs

 -
The discrete inputs/outputs
　
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