Audio Management - Electrical Power Supply of System
Figure 007A
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Supply of the Captain ACP 2RN1, of the audio board A (capt + bay) and of the SELCAL board via 3A circuit breaker 4RN.
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Supply of the first Officer ACP 2RN2, of the audio boardB (F/O - 3. occpnt) and of the BITE board via 3A circuit breaker 5RN.
-Circuit breaker 9RN is unused.
**ON A/C ALL
Circuit breakers 4RN, 5RN and 9RN are located on the overhead panel 49VU. Circuit breakers 6RN and 8RN are located on the rear wall, on panel 121VU.
5. Component Description
_____________________
A. Audio Control Panel
(1) Function
The ACP supplies the means:
-
To use the various radio communication and radio navigation facilities installed on the aircraft for transmission and reception of the audio signals.
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To display the various calls (SELCAL, ground crew call and calls
from the Cabin Attendants). The ACP serves only for control and indication.
(2) Mechanical description
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-220,
(Ref. Fig. 008)
R **ON A/C 106-149, 221-299, 301-399, 401-499,
(Ref. Fig. 008A)
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Audio Control Panel - Front Face
Figure 008
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Audio Control Panel - Front Face
Figure 008A
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The front face comprises:
-7 rectangular electronic pushbutton switches for selection of the transmission channels. They also display the SELCAL, ground crew and Cabin Attendant calls,
-1 rectangular electronic pushbutton switch separated from the other 7 pushbutton switches. This pushbutton switch selects the transmission channel for passenger address (PA) announcements
-15 round pushbutton switches with associated potentiometers for selection and adjustment of the audio level on the reception channels
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1 INT/RAD selector switch which selects the radio and flight interphone functions. It is a three-position switch : stable in INT and middle position, unstable in RAD position.
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1 rectangular VOICE pushbutton switch which connects a filter into the audio circuits of the VOR and ADF navigation systems.
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1 RESET rectangular electronic pushbutton switch which is used to
cancel the lighted calls. The ACP is connected to the AMU and to the various aircraft circuits by means of a round 19-pin connector.
(3) Functional description
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-220,
(Ref. Fig. 009)
R **ON A/C 106-149, 221-299, 301-399, 401-499,
(Ref. Fig. 009A)
**ON A/C ALL
(a) Transmission channel selection
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-220,
(Ref. Fig. 009)
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Audio Control Panel - Functional Description
Figure 009
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Audio Control Panel - Functional Description
Figure 009A
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(Ref. Fig. 009A)
**ON A/C ALL
(B) To connect the microphones and the PTT command to the selected transmitter, push one of the 8 rectangular transmission pushbutton switches (VHF1- VHF2- VHF3- HF1- HF2- INT- CAB- PA). The three green bars on the transmission pushbutton switch, which indicate that selection has been accepted, come on. An electronic device inhibits simultaneous selection of several transmitters and therefore several transmission pushbutton switches cannot be selected at the same time. When a new transmission function is selected, the green bars of the selected pushbutton switch come on and the function is selected. At the same time, the previously selected pushbutton switch is disabled and its green bars go off. If you push a pushbutton switch which is already selected, the function is disabled. The green bars which indicate transmission go off and no transmission function is selected on the ACP. The rectangular PA pushbutton switch is unstable, i.e. it must be held pressed during the complete transmission time. This avoids unwanted transmission on the PA circuit. This unstable operation can be inhibited by the AMU pin-program (Ref. Para. Operation -Pin Program).
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