*
Isolate transfer of engine data between the systems ARINC 629 buses and analog, analog discrete and ARINC 429 buses.
All DCGF data transfers follow the same basic data flow. The IOMs receive the data. The data then moves to the CPMs over the backplane data bus. The CPMs reformat the data and send the data back to the IOMs. The IOMs then transmit the data.
DCGF Types
There are seven different types of data transfer.
DCGF Type 1: The AIMS cabinets receive ARINC 429, analog discrete signals, and analog signals and transmit the data to the flight controls ARINC 629 buses.
DCGF Type 2: The AIMS cabinets receive ARINC 429 and analog discrete signals and transmit the data to the systems ARINC 629 buses.
DCGF Type 3: The AIMS cabinets receive data from the flight controls ARINC 629 buses and transmit the data to the systems ARINC 629 buses.
DCGF Type 4: The AIMS cabinets receive data from the systems ARINC 629 buses and transmit the data to the flight controls ARINC 629 buses.
DCGF Type 5: The AIMS cabinets receive data from the flight controls ARINC 629 buses and transmit ARINC 429 data and analog discrete signals.
DCGF Type 6: The AIMS cabinets receive data from the systems ARINC 629 buses and transmit ARINC 429 data and analog discrete signals.
DCGF Type 7: The AIMS cabinets receive data from a systems ARINC 629 bus and transmit the data to another systems ARINC 629 bus.
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AIMS -DATA CONVERSION GATEWAY FUNCTION FUNCTIONAL DESCRIPTION
DCGF Software
Each AIMS cabinet has two DCGFs. Each DCGF has a master and a shadow. The master is in control unless the CPM fails. Then the shadow takes over. DCGF1 is in the two CPM/GGs. CPM/GG M0010 is the master and CPM/GG M0011 is the shadow. DCGF2 is in the CPM/COMM and the CPM/Basic or CPM/ACMF. The CPM/Basic or CPM/ACMF is the master and the CPM/COMM is the shadow. DCGF1 and DCGF2 operate independently.
DCGF1 processes left engine data, data transfers and AOA and TAT calculations. DCGF2 processes right engine data and data transfers.
The engine data is data that goes to and from both engines for control and indication. This data goes to the EECs via the engine data interface units:
*
ADIRU and SAARU data
*
Autothrottle trim commands
*
Condition of various engine related flight deck controls and switches.
Training Information Point
The status message AIMS shows when the DCGF fails in more than one of the CPMs or there is insufficient input/output resources for more than one second.
When only one of the DCGFs fail, a scheduled maintenance task (SMT) message AIMS CABINET LRM shows. It is a requirement that you do a check for this SMT message every 30 days. If the SMT message shows, you must do the corrective action for the DCGF. The SMT messages are on the maintenance task maintenance page.
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AIMS -UNIVERSAL TIME (COORDINATED) FUNCTION FUNCTIONAL DESCRIPTION
General
The core processor modules (CPMs) each perform the universal time (coordinated) function (UTCF) in addition to their other major functions.
Each CPM has a UTCF that supplies universal time (coordinated) (UTC) and date to all the functions in that CPM. One of the CPMs in each cabinet also sends UTC and date to the other airplane systems.
Time and Date Calculation
The AIMS cabinets receive time and date data from the multi-mode receivers (MMRs). The MMRs also send an analog time mark once per second. The UTCF uses the time mark signal and the time data to calculate the UTC.
CPM Interface
The UTCF in each CPM calculates the UTC and provides the UTC and date to the functions on that CPM. The UTCF uses the left MMR data if it is valid. Otherwise, the UTCF uses the right MMR data. If MMR data is not available, the UTCF maintains the UTC and the date. It does this based on the last valid data received from the MMR and its own internal clock.
The hot battery bus power lets the CPM clocks keep time when no other sources of power is available to the CPMs.
User System Interface
Each AIMS cabinet transmits UTC and date data to other airplane systems on these ARINC 429 data buses:
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General purpose #1 bus
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General purpose #2 bus
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Inertial reference bus
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Central maintenance buses (L/C/R).
Each AIMS cabinet transmits UTC and date data to other airplane systems on these ARINC 629 data buses:
*
Flight controls buses
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