2_ Automatically: further to the reception of a demand from the ground (this corresponds to the ACARS CALL configuration described in para. Operation-Connection with the FWCs).
(b) From radio to DATA mode
1_ Upon crew command: through the RMPs (Ref. para. Operation-Connection with the RMPs) or one MCDU.
2_ Automatically: the ACARS MU receives the push-to-talk discrete sent by the Audio Management Unit to the VHF3 and therefore detects the transmissions performed in radio mode. The ACARS MU can require automatic reversion to the DATA mode when it no longer detects transmissions in radio mode.
F. Connection with the RMPs
R **ON A/C 001-049, 051-061, 101-105,
R (Ref. Fig. 004)
R **ON A/C 001-049, 051-099, 101-105,
R (Ref. Fig. 005)
(1) Each RMP receives the port select discrete (Ref. para. Operation-Connection with the VHF3 Transceiver).
(a) If the ACARS MU controls the VHF3 frequency, the following appears when the VHF3 mode is selected on one RMP: - ACARS in the ACTIVE display window - A frequency in the STBY/CRS display. This frequency can be modified by means of the selector knob located under the STBY/CRS display window. It can be different on each RMP.
(b) If the RMPs control the VHF3 frequency, the following appears when the VHF3 mode is selected on one RMP: - A frequency (the same for all the RMPs) in the ACTIVE display window - ACARS in the STBY/CRS display.
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ACARS - Modification of Voice Communication Frequency Through the RMPs (Sheet 1/2) R Figure 004
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ACARS - Modification of Voice Communication Frequency Through the RMPs (Sheet 2/2) R Figure 005
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NOTE : The ACARS indication in the ACTIVE display window of the
____ RMPs indicates that the VHF3 frequency is controlled through the ACARS MU. It does not mean that the VHF3 operates in DATA mode (the VHF3 can operate in radio mode with a frequency controlled through the ACARS MU). If the ACARS indication appears in the STBY/CRS display window, the VHF3 shall operate in radio mode on the frequency shown in the ACTIVE display window of the RMPs.
(2) Depending on the pin-programming of the ACARS MU (TP 11C grounded or in open circuit), the VHF3 frequency is controlled through the RMPs (in radio mode), the ACARS MU (in DATA mode ) or through the ACARS MU only (in radio or DATA mode).
(a) Control of VHF3 frequency through RMPs and ACARS MU
1_ When it is necessary to switch over VHF3 frequency control
from the ACARS MU to the RMPs (or vice versa), the RMPs send
the remote voice/data select discrete with a momentary change
in state from open circuit to ground.
The command is initiated when, the VHF3 display mode being
selected on one RMP, the transfer pushbutton switch (between
the two display windows) is pushed.
2_ When the command is initiated with VHF3 frequency controlled
through the ACARS MU (the ACARS indication appears in the
ACTIVE display window):
- The RMP display in VHF3 mode remains unchanged until the
control is given to the RMPs by the ACARS MU by changing the
state of the port select discrete to open circuit.
- When the control is given to the RMPs by the ACARS MU, the
RMPs (which receive the port select discrete), modify their
display in VHF3 mode as follows:
* The ACARS indication appears in the STBY/CRS display
window of all the RMPs.
* The frequency which was in the STBY/CRS display window of
the RMP which has generated the command, appears in the
ACTIVE display of all the RMPs.
NOTE : Three seconds can elapse between command and display____
modification.
3_ When the remote voice/data select command is initiated with
VHF3 frequency controlled through the RMPs (the ACARS
indication appears in the STBY display):
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