7. Test
____
A. Maintenance and test The EIS includes Hard-oriented and Soft-oriented Built-In-Test (BITE) functions. The CFDS (Centralized Fault Data System) facilitates the interface of these BITE resident routines for maintenance and test implemented in the various computers.
(1)
Failure Detection Functions The BITE of a computer is able to detect the internal failures as well as failures affecting the I/P parameters. The BITE is designed so as to minimize the undetected failures, and to make the maintenance of the system easier. To that end, the events detected by the BITE (anomaly, abnormal disengagement, failure...) are coded and stored in non-volatile memories called BITE memories, under the form of messages in alphanumeric characters. The GMT at the time of each failure is recorded and stored with the associated event. The BITE memories store information concerning several flights. The CFDS helps the flight crew and the maintenance personnel by providing the capability of displaying the above messages, as well as system maintenance data and procedures, through the interactive multipurpose Control and Display Units (MCDUs), located on the center pedestal.
(2)
Operation The CFDIU addresses through its common O/P bus line the DMCs.
R (Ref. Fig. 054) The CFDIU common bus line conveys 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.
In return, the addressed A/C computer sends on its O/P bus line
(ARINC 429) to the CFDIU the following information:
- one word for identification of the A/C computer, so that the CFDIU
recognizes where the maintenance message is coming from
-several words of characters, encoded per ISO alphabet No. 5, and forming messages in plain English language. These messages are a translation of the BITE memory stored events. They will give the faults at the LRU level in flight, and at a deeper level on the ground (complete BITE memory dump available through menus).
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-60-00Page A14 1201-299, 301-302, 1Config-1 May 01/05 1 1 1CES 1
CFDIU to EFIS/ECAM Interface R Figure 054
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-60-00Page A15 1201-299, 301-302, 1Config-1 May 01/05 1 1 1CES 1 Each EIS computer sends immediately to the CFDIU the message(s) corresponding to any impending failure, so that they are readily available to the flight crew, if required, through the maintenance mode of the MCDUs. To this end, the crew press the MCDU MENU mode key on the MCDU. A menu is offered, proposing : FMS, CFDS, ACARS, AIDS main functions. The crew must press the line key adjacent to the chosen function (CFDS in our function). The MCDU then displays the list of the LRUs for which a fault has been recorded so far during the flight. The CFDIU stores in its EEPROM memory all the events concerning the last flight leg, so that the ground maintenance crew can have a history of the last flight leg after the flight. The maintenance team is then aware of the LRUs having recorded faults, and, by means of more detailed menus presented on the MCDUs set in the maintenance mode, they are able to carry out 1st or 2nd level trouble shooting tasks. Upon request, the CFDIU addresses the selected computer(s) and provides access to their BITE content through defined control codes
R (Ref. Fig. 055)
NOTE : The BITE of the DMCs also provides storage of the maximum
____ speed/temperature reached by the engines if these values are exceeded.
(3) System Test Functions The equipment BITEs enable the flight and maintenance crew to perform overall system tests, easily readable and interpretable. A test mode provides at a glance a confidence check of the EIS. The DUs then show a test pattern. Another test mode enables a thorough monitoring of all the EIS inputs, by performing loop-around checks. These tests are accessible through menus presented on the MCDUs. These test modes are not available in flight.
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-60-00Page A16 1201-299, 301-302, 1Config-1 May 01/05 1 1 1CES 1
CFDS Menu Access to BITE R Figure 055
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-60-00Page A17 1201-299, 301-302, 1Config-1 May 01/05 1 1 1CES 1R **ON A/C 001-049, 051-060, 101-101,
B. Power-up test initialisation and cockpit repercussions
(1) Display unit
(a) Conditions of power-up tests initialization
-How long the computer must be de-energized: > 6 s.
-A/C configuration: whatever the A/C configuration on ground.
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