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Miscellaneous Module
Figure 028
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8_ WATER QTY
The WATER QTY LED display shows the actual contents in the
water tank graduated in 20 steps, each step is equal to 5%.
**ON A/C 001-049, 051-099, 101-105,
9 WASTE QTY
_ The WASTE QTY LED display shows the actual contents in the waste tank graduated in 20 steps, each step is equal to 5%.
**ON A/C 151-199, 201-299,
9 WASTE QTY
_ The WASTE QTY LED display shows the actual contents in the waste tank graduated in 20 steps, each step is equal to 5%.
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
10 IND ON
__ The IND ON membrane switch, switches on the water and waste indicating system.
11 SYSTEM INOP, LAV INOP
__ The SYSTEM INOP indicator light comes on, if the vacuum waste system fails.
D. AFT Attendant Panel **ON A/C 001-049, 101-105,
(Ref. Fig. 029) **ON A/C 051-099,
(Ref. Fig. 029A) **ON A/C 151-199,
(Ref. Fig. 029B)
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AFT Attendant Panel Figure 029
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R AFT Attendant Panel
R Figure 029A
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1 1 Config-1 May 01/05
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AFT Attendant Panel
R Figure 029B
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1 1 Config-1 May 01/05
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**ON A/C 201-210,
(Ref. Fig. 029C)
**ON A/C 211-299,
(Ref. Fig. 029D)
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
(Ref. Fig. 030)
(1) Description
(a)
General The AFT Attendant Panel (AAP) 126RH is installed in the aft entrance area of the aircraft. It enables the aft attendant to control different cabin systems.
(b)
Function The AFT attendant panel performs these functions:
-
the adaptation of received data bus signals,
-
the processing of addressed commands and controls,
-
the processing of inputs from cabin systems,
-
the processing of inputs from membrane switches on AFT attendant panel,
-
the transmission of data at assigned intervals via the data bus,
-
the fail passive for data bus transmission and reception in case of AFT attendant panel failure,
-
the short-circuit protection of discrete outputs.
(c)
Architecture The AFT attendant panel contains these principle components:
-
the power supply,
-
the RS 232 data bus receiver and transmitter,
-
the processing module,
-
the I/O circuitry.
1_ Power Supply
The power supply derives from the service busbar 601PP for all
the necessary internal voltages from a 28 V DC input.
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AFT Attendant Panel
Figure 029C
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AFT Attendant Panel
Figure 029D
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Connections to the AFT ATTND panel
Figure 030
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2_ RS 232 Interface
The RS 232 interface receives serial data from the DEU B and
converts it into the parallel data format. The RS 232
interface also takes parallel data from the processing module,
serializes it and transmits it to the DEU B. Separate lines
are used for transmission and reception of data.
3_ Processing Module
The processing module carries out all internal operations of
the AFT attendant panel. It interfaces the membrane switches
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