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in the menu mode, which is available on the ground only, a thorough access to the BITE contents is provided through the interactive MCDU which displays the various menus elaborated by the DMCs, in particular: . main EIS menu with last leg and previous legs report . full BITE memory dump menu.
The above described operation, in the normal mode and in the menu mode, is made possible by means of the data exchange between DMCs and CFDIU. The CFDIU permanently addresses through its common bus line the A/C computers and provides them with the following information:
-GMT, flight number, date ... for numbering and marking the events stored in the BITE (system disconnection, failures, ...)
-control words for addressing the A/C computer and requesting its BITE
memory contents In return, the addressed A/C computer sends through an ARINC 429 O/P bus (a dedicated bus is reserved by the DMCs to that purpose) to the CFDIU the following information:
1EFF : ALL 1 31-69-00Page 2 1 1 Aug 01/05R 1 1 1CES 1
EIS/FWS - CFDS Interface
Figure 001
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1
- one word for identification of the A/C computer, so that the CFDIU knows the origin of the maintenance message
-several words of characters, encoded per ISO alphabet No. 5, and forming messages in plain engligh language. These messages are a translation of the BITE memory stored events. They give the faults at the LRU level in flight and at a deeper level on the ground (complete BITE memory dump available through menus).
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
The DMC menus also enable the flight and maintenance crew to perform overall system tests, easily readable and interpretable.
R **ON A/C 106-149, 303-399, 401-499,
The DMC menus also enable the flight and maintenance crew to perform overall system tests, easily readable and interpretable.
**ON A/C ALL
-Display test On the ground, on request from the MCDU, a test pattern is displayed on the DUs.
This test pattern enables the maintenance crew to assess the condition of the DUs for ageing and display quality, thus providing at a glance a confidence check of the Display Units.
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
-I/P test On the ground, on request from the MCDU, a thorough monitoring of all the buses from the various DMC I/P sensors and A/C computers is provided, thus signalling the hidden failures of the DMC sources which are not used in the normal configuration (e.g. FWC2, ...).
R **ON A/C 106-149, 303-399, 401-499,
-Data Bus test On the ground, this test is available, to check thelinks DMC to DU or DU to DMC, or the related input ports.
-DU Backlight status test
1EFF : ALL 1 31-69-00Page 5 1 1 Aug 01/05 1 1 1CES 1 This test allows to check the good working conditions of the bulbs of the light box assembly.
-DU Brightness test This test allows to check the good working conditions of the brightness control system of the DU.
**ON A/C ALL
-System test On the ground, on request from the MCDU, the DMC performs the functional tests of all the internal functions of the system (DMC, DUs, DMC-DUs links).
-Switching test On the ground, on request from the MCDU, the DMC performs the functional tests of all the switching functions of the system (DMC, DUs, DMC-DUs links and switching links).
2. Failure Detection-BITE Organization
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A. Internal Failures The internal failures are those concerning the EIS items of equipment only, i.e. DMCs, DUs, A/C wiring (including relay boxes and various controls such as knobs, selector switches, pushbutton switches). The internal failures of the DMC are those which stop the DMC operation and force it to switch to the SYNCHRO mode and to initiate a power on Self-Test.
B. External Failures The external failures are those concerning the DMC I/P buses, i.e. loss of activity from a given bus, or labels no longer transmitted or seen in the INVALID condition.
R **ON A/C 106-149, 303-399, 401-499,
C. Fault messages A bus fault message is of the form: ADIRU2(1FP2)BUS1 ADR/DMC1(1WT1) where the bus ADIRU2 BUS1 ADR drives the DMC1. The message means the bus is faulty. When there is only one link between a LRU and the DMC the fault message is of the form ADF1(2RP1)/DMCx(1WTx). The message means ADF1 data is not available.
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