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DME/DME
*
DME/VOR.
The FMCFs do not use ADF bearing in their position calculations.
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General
These are the three types of procedures to tune navigation radio:
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Automatic
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Manual
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Alternate.
For the automatic procedure, the FMCFs send tune data to the ILS, VOR and DME navigation radios automatically. The ADF navigation radios are not tuned automatically.
For the manual tune procedure, you use the left or right CDU to manually tune all of the navigation radios through the FMCFs. You use the center CDU to manually tune the navigation radios only when the left or right CDU fails.
When both FMCFs fail, you use the CDUs and the alternate procedure to tune all of the navigation radios. The tune data goes from the on-side CDU directly to the on-side navigation radio. The center multi-mode receiver (MMR) gets the alternate tune data from the left CDU.
FMCF Radio Tune Outputs
Both FMCFs in the AIMS cabinets generate radio tune data. The left AIMS cabinet sends radio tune data to the right AIMS cabinet on ARINC 429 data buses.
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The right AIMS FMCF radio tune sub-function normally tunes the navigation radios. The right AIMS cabinet has the radio tune relays. The radio tune relays energize when the right navigation radio tune sub-function and the input/output modules (IOMs) are valid.
Both AIMS FMCF radio tune sub-functions process radio input data and make radio tune output data. When the right radio tune sub-function fails, the right radio tune relays de-energize. This allows the left AIMS radio tune sub-function to tune the radios through the relaxed position of the relays in the right AIMS cabinet.
The right AIMS cabinet IOM M004 sends radio tune data to input port B in these radios:
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Right MMR receiver
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Right VOR receiver
*
Right DME interrogator
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Right ADF receiver, manual tune only.
The right AIMS cabinet IOM M009 sends radio tune data to input port B in these radios:
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Left MMR
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Left VOR receiver
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Left DME interrogator
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Left ADF receiver, manual tune only.
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The right AIMS cabinet IOM M008 sends radio tune data to input port B in the center ILS receiver.
CDU Navigation Radio Outputs -ARINC 429 Bus
When the FMCFs fail, the CDUs send a frequency source select discrete to the navigation radios. This discrete causes the navigation radios to select the input port A. Input port A receives the tune frequency directly from the ARINC 429 bus of the on-side CDU.
The FMCF or the on-side CDU for the alterenate tune procedure send this data to the NAV radios:
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ILS frequency and runway heading
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DME frequency
*
VOR frequency and course
*
ADF frequency, tune mode.
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FMCS -FMCF INTERFACES -4
General
The CDU is the primary interface for the FMCF and other systems. The CDU also processes inputs from external sensors to supply alternate commands when the active FMCF fails. The CDUs receive some of the same inputs as the FMCFs.
The CDU also supplies:
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Alternate lateral navigation steering commands and map display data (LNAV)
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The interface with SATCOM
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The interface with the passenger address/cabin interphone (PA/CI) controller on the center CDU
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Alternate radio tuning (L and R)
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Alternate electronic flight instrument system control panel (EFIS CP)
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Alternate display select panel (DSP) control
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Alternate map display and control
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