-
The RESET membrane switch (EVAC and SMOKE(lavatory-smoke))
R **ON A/C 106-149, 301-399, 401-499,
M. Attendant Indication Panel (AIP)
(1)
General The AIP provides an attendant far call function. Its display shows dial and call information from the PA/Interphone system and other system-related information (e.g. Lav Smoke Location/PAX Calls). The AIPs are installed near all attendant stations in the cabin.
(2)
Architecture
The AIP has these modules and circuits:
-
Display,
-
Display controller,
-
Display driver,
-Single chip microcomputer,
-RAM and Read Only Memory (ROM),
-Erasable Programmable Read Only Memory (EPROM),
-Line receiver/transmitter,
-Power supply circuits,
-Two indicator lights.
(3)
Functions
(a)
Display The display has two rows where all messages are displayed.
(b)
Display controller This unit generates all characters which are shown on the display.
(c)
Display driver This unit drives the display according to the commands received from the line receiver.
(d)
Single chip microcomputer This unit coordinates the operation of the different modules and the operation of the software.
(e)
RAM and Read Only Memory (ROM) This unit contains the AIP software program.
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(f)
Erasable Programmable Read Only Memory (EPROM) All messages for the display are stored in the EPROM as alphanumeric text data.
(g)
Line receiver/transmitter This unit receives and sends information from and to the DEU type B via a RS-232 data bus.
(h)
Power supply circuits This unit supplies all necessary power to the AIP circuits and to the outputs. The unit switches the AIP into a standby mode with lowest power consumption while indications are displayed.
(i)
Two indicator lights One red and one green indicator light are installed. They are used to show the attendant the importance of the related message over a distance.
N. Area Call Panel (ACP)
(1)
General The ACPs give a long-range visual indication related to system information (e.g. Lav Smoke Location/PAX Calls).
(2)
Architecture The ACP has four separately controlled fields. Each field contains coloured LEDs, they are visible from the front and the rear of the ACP.
(3)
Functions The four fields are separately activated to show the different system information. The LEDs flash or come on steady. They are used as a far-call facility to inform cabin attendants of PAX-call, interphone call, lavatory smoke and EVAC signals.
P. Cabin handsets
R **ON A/C 106-149, 401-499,
(Ref. Fig. 024)
**ON A/C 301-399,
(Ref. Fig. 024A)
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Cabin handset Figure 024
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Cabin handset
Figure 024A
R 1EFF : 301-399, 1 23-73-00 Page 76
1 1 Config-2 Aug 01/05
1 1
1CES 1
R **ON A/C 106-149, 301-399, 401-499,
(1)
General The attendants use the cabin handsets for the Cabin and Flight Crew Interphone functions and for PA announcements. An integrated keyboard is used to make different types of calls/announcements.
(2)
Architecture
The handset has these components:
-Integrated keyboard,
-'Push To Talk' button,
-Microphone,
-Earphone,
-Tone dialling interface circuit,
-Reed contact,
(3)
Functions
(a)
Integrated keyboard With the integrated keyboard the related functions are selected and establish a communication link.
(b)
'Push To Talk' button This button activates the microphone in the handset. In special cases this button establishes also a communication link.
(c)
Microphone The microphone changes the voice into the related signals.
(d)
Earphone The earphone changes the related signals into the voice.
(e)
Tone dialling interface circuit The interface decodes the keyboard signals and generates Dual Tone Multiple Frequency (DTMF) coded dial signals. Voice signals are routed through to the outputs of the interface.
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