If the code for no programming is received, the DMU works according to the A/C type code from the last flight. If there is no coding from the last flight, the DMU works with the CFMI type code.
(2)
The A/C type coding, parameter 17.1.304.00, is shown below: A history buffer is provided for the history data required by the AIDS reports and the DAR and SAR. It is the responsibility of the sampling task, to control this buffer and manage the history buffering. The management of the history buffer is determined by the parameter sampling table. It is possible to program additional parameters for history buffering via Ground Support Equipment (GSE).
(3)
DMU Internal Parameter Internally the DMU processed parameter are referred to as "Internal Parameters". All internal parameters are identified by a parameter number consisting of the EQ/SYS/LABEL/SDI. For the DMU applications up to 400 internal parameters can be created. In addition the parameter can be assigned with an alpha call-up code for identification through GSE programming.
Internal parameters are provided for:
-DMU internal counter and timer,
-Filtered Parameters,
-Flags for certain flight conditions,
-Report status words,
-SAR channel words,
-additional global computed variables defined by the user
(4) Parameter Label Call-Up Each parameter (ARINC 429 data word) transmitted on one of the connected data buses is selectable, you use: EQ, source system, label, SDI and number of data bits for display on the MCDU. The number of data bits can be omitted. The displayed parameters are updated once per second. The menus are shown in 'ADIS PARAM LABEL CALL-UP'. Up to 2 parameters can be displayed on one page. 8 pages can be selected via slew up/slew down button, which leads to a maximum number of 16 parameters to be monitored simultaniously. If there are additional parameters in the future, it is possible to call them up in the same way without having to change the software.
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Example for Parameter Call-up: EQ/SYS/LAB/SDI = 1A/2/156/01
(5)
Parameter Alpha Call-Up (ACU) For all the parameters for which an alpha code is mentioned in the parameter list. The selection is performed by their alpha codes. If parameters from two systems are available, both parameters are displayed on the MCDU upon a single alpha call-up code entry. The display values will refreshed once per second. All numeric type alpha call-up parameters will displayed on the MCDU in engineering units. The display format is a floating point representation of max. 6 charakters including the decimal point and the '-' sign, if applicable. In case of positiv numbers without decimal point all 6 characters shall be available for digits. Display of leading zero shall be suppressed. The applicable units shall be displayed below the alpha call-up code on the MCDU screen. Alpha call-up parameters, which consist of a combination of several discrete bits or packed discretes will displayed in HEX. Discrete alpha call-up parameters shall be displayed using English status indications of max. 6 characters together with the actual bit status. The unit indication on the MCDU screen shall be 'DISCRETE'.
(6)
Additional Parameter Programming If a new label (parameter) is used in the DMU (for other than a parameter label call-up) it must be programmed via the GSE.
(7)
Test Input Parameters The DMU DITS ports no. 49 and 50 are dedicated test inputs. This ports are wired to the the rear- and DMU test connectors. The test connector allows access to all ARINC 429 buses in the aircraft. The DMU DITS 'Test Inputs' are referenced with the GSE programmable equipment code.
(8)
Additional Bus If an additional ARINC 429 Bus is connected to one of the DMU ports, the characteristics of the new Bus (transmission speed, equipment code, system number) is programmable via the GSE for the appropriate port number. The new parameter is used for the purpose of no limitation label call-up, trigger logics, data recording and reports.
(9)
Engineering Unit Conversion (EUC) The DMU provide an 'Engineering Unit Conversion Table' to convert a selected group of input parameters (same as supplied with alpha call-ups) into the applicable engineering units. The EUC table is associated to the alpha call-up table. The GSE reconfiguration software allow to add or modify the conversion constants. Modifications are made by specifying a single scale constant, number of data bits and sign.
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(10) Special Rules for Kg and Deg C All parameters for which an alpha acronym is defined in the parameter list is available for alpha call-up. With a single call-up system 1 and 2 parameters are displayed in engineering units. The DMU is observe bit 18 and bit 27 of DMC label 305. If bit 18 = 1, then the parameter values are shown in print out and alpha call-up in the following units: fuel flow (eng 1 and 2): lbs/hours instead of Kg/hours (7C.1.244.01, 7C.2.244.10)
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