-
the audio selector panels,
-
the flight compartment boomset,
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the hand microphones,
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the oxygen mask microphones,
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the flight compartment handset located at the center pedestal.
(b)
Avionics Compartment
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the audio management unit,
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the link to CFDS,
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the two CIDS directors,
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the oil pressure switch,
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the flight compartment pressure controller,
-
the link to the prerecorded announcement reproducer,
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PA System Architecture
Figure 037
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PA System Architecture
Figure 037A
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-
the link to PES multiplexer,
-
the link to PES tape reproducer.
**ON A/C 051-099, 201-210,
-the link to video control unit.
**ON A/C 211-299,
-the link to video control unit.
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
(c) Cabin
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the cabin Loudspeakers,
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the CIDS DEU A, with two independant amplifiers,
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the attendant handset with integrated keyboard,
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the attendant indication panels,
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the CIDS DEU B, with two handset interfaces,
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the programming and test panel,
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the forward attendant panel.
(2) System Description
(a) General The CIDS director accepts audio signals from the various PA sources in the aircraft. It assigns priorities to each source. It transmits the signal in digital form via the four top line data busses to the DEUs A. These send it to the cabin loudspeakers for broadcasting. The passenger adress system has different annoncement modes. Each mode uses a different PA function. These functions are assigned with the CAM software.
You can perform PA announcements from different sound sources. The director can route the broadcasts to any combination of six audio channels. A separate amplifier drives each cabin loudspeaker. It is programmed on the CIDS initialization for the gain, the frequency characteristic and the assignment to one of the six audio channels. Three channels are reserved for attendant broadcasts, and three for passenger announcements. This lets you assign each cabin loudspeaker to one of up to three zones. A PA
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chime capability is also given. The PA system remains available during aircraft emergency conditions. It is powered down as long as no PA announcements are in progress.
**ON A/C 001-049, 101-105, 151-199,
(b) Annunciation and Source Priority An indication is shown on all attendant indication panels whenever a PA broadcast is performed (e.g. PA IN USE). The sound sources are divided into these priorities:
-
the 1st priority: flight compartment station AMU
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the 2nd priority: flight compartment station handset
-
the 3rd priority: attendant stations
-
the 4th priority: PRAM
-
the 5th priority: boarding music.
**ON A/C 051-099,
(b) Annunciation and Source Priority An indication is shown on all attendant indication panels whenever a PA broadcast is performed (e.g. PA IN USE). The sound sources are divided into these priorities:
-
the 1st priority: flight compartment station AMU
-
the 2nd priority: flight compartment station handset
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