-
The water valve opens 1.6 seconds after operation of the flush
switch, and stays open for 1.7 seconds. In this time the toilet bowl is rinsed.
-
The flush valve opens 2.2 seconds after operation of the flush switch, and it stays open for 4 seconds.
R 1EFF : 001-049, 051-056, 1 38-31-00Page 37 1 1 Aug 01/05 1 1 1CES 1 The differential pressure now moves the waste from the toilet bowl to the waste holding tank. Above 5487 m (18000 ft.) altitude, the flush cycle will stay the same. But the vacuum system controller will remove the electrical power from the vacuum generator and stop the generator operation.
(b)
Double Flush
-In order to activate a second flush within the same flush cycle, the flush switch has to be pushed again. When the flush switch is pushed between 3 and 8 seconds after the first operation:
-The water valve (rinse valve) will open (8 seconds after first operation of the flush switch) for 2.7 seconds
-2.2 seconds later, the flush valve opens for 4 seconds
-The flush cycle is completed 10 seconds after the second operation of the flush switch.
(c)
Built-In Test Equipment (BITE) The BITE of the flush control unit finds the faults of the:
-Water valve solenoid
-
Flush valve motor
-
Flush valve (valve open)
-
Flush valve (valve closed)
-
Flush control unit.
NOTE : Faults found are transmitted from BITE to the VSC.
____
R **ON A/C 057-099, 101-149, 151-199, 201-299, 301-399, 401-499,
**ON A/C 057-099, 101-105, 151-199, 201-299,
(Ref. Fig. 006)
R **ON A/C 106-149, 301-399, 401-499,
(Ref. Fig. 006A)
**ON A/C 057-099, 101-105, 151-199, 201-299,
(Ref. Fig. 007)
R 1EFF : 052-055, 057-099, 101-149, 151-199, 1 38-31-00Page 38 1201-299, 301-399, 401-499, 1Aug 01/05 1 1 1CES 1
R **ON A/C 106-149, 301-399, 401-499,
(Ref. Fig. 007A)
R **ON A/C 057-099, 101-149, 151-199, 201-299, 301-399, 401-499,
A. Toilet Assembly 50MG
(1)
General The toilet assembly has a Flush Control Unit (FCU) which controls its operation. Potable water from the aircraft pressurized water system from between 1.72 bar (25 psi) to 1.93 bar (28 psi) flushes the toilet bowl. Differential pressure between the waste tank and cabin moves water and waste from the bowl into the waste holding tank.
(2)
Flush Control Unit (Ref. Fig. 008A) The time and sequence of the different components is controlled through the Flush Control Unit (FCU), which controls the toilet flush cycle. The FCU BITE monitors the water valve, flush valve and internal control circuitry. If a fault is detected, it is transmitted through the DEU B to DIR 1-2 of the CIDS system.
(a) Flush Cycle Sequence (Ref. Fig. 008A) The flush cycle starts when you push the flush switch, and the FCU starts the flush sequence as follows:
-
The vacuum generator starts to operate after the operation of the flush switch, (if differential presser is below 246 mbar
(3.6 psi) during climb and below 203 mbar (2.94 psi) during the descent) and stays on for approximately 15 seconds
-
The water valve opens 1.6 seconds after operation of the flush
switch, and stays open for 1.7 seconds. In this time the toilet bowl is rinsed.
-
The flush valve opens 2.0 seconds after operation of the flush
switch, and it stays open for 4 seconds. The differential pressure now moves the waste from the toilet bowl to the waste holding tank. When the diffrential pressure is sufficient, the flush cycle will stay the same. But the CIDS will not activate the vacuum generater.
(b) Built-In Test Equipment (BITE) The BITE of the flush control unit finds the faults of the:
-Water valve solenoid
-Flush valve motor
R 1EFF : 057-099, 101-149, 151-199, 201-299, 1 38-31-00Page 39 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1
Flush Control Unit - Schematic and Flush Cycle Sequence
Figure 008A
R 1EFF : 057-099, 101-149, 151-199, 201-299, 1 38-31-00Page 40 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1
-
Flush valve (limit switch open)
-
Flush valve (limit switch closed)
-
Flush control unit.
NOTE : Faults found are transmitted from BITE via the DEU B to
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