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R R R R R R R R R  When transmission has been performed correctly, the CFDIU displays the XMITTED TO ATSU message in the scratchpad and displays the asterisk again. These two messages are amber. The operator cannot change page as long as the CFDIU has not displayed one of the above messages and displayed the asterisk again. The CFDIU may abandon all its current functions in order to satisfy a manual transmission request. 
R R R  (b) Automatic message transmission When the CFDIU carries out an automatic transmission, it does not display a message in the scratchpad.
 **ON A/C ALL
 E. Use of the CFDS by the Maintenance Operator It has been seen that the MCDU enables dialog with the CFDIU, or with the systems connected to the CFDIU.
 (1) Use of the CFDS at line stops It has been seen that the purpose of line maintenance is to repair the aircraft in 15 to 20 minutes, in other words to find the faulty LRU and replace it. In order to do this the line mechanic mainly uses the dialog with the CFDIU, i.e. the functions proper to the CFDIU. Access to these functions is gained by performing two consecutive actions:
 - press the MCDU MENU mode key on keyboard - press the CFDS line key. This can be done on any MCDU, but only on one at a time. The operator then obtains the CFDS main menu functions on the MCDU. With this menu displayed, the mechanic shall select the following items:
 (a) LAST LEG REPORT or POST FLIGHT REPORT These reports inform him of all aircraft system faults. In theory the LAST LEG REPORT enables the mechanic to find the LRU to be replaced. The POST FLIGHT REPORT associates all the ECAM warnings and gives further information concerning the failed LRU if the faulty message is not sufficiently precise (the

 

 (b) AVIONICS STATUS When the faulty LRU has been replaced, the mechanic executes this function, which gives the status of aircraft systems (correct or faulty operation) and enables him to check that the repair is effective.
 NOTE : When the replaced equipment is energized, the power-up
____ tests enable the system to declare its status (correct or faulty). Furthermore, the CFDIU monitors refreshment of the output bus.
 NOTE : Certain systems have a TEST function in their menu; access
____ to this function is gained by means of the SYSTEM REPORT/TEST function. In most cases this test, activated from the menu, is the same as the power-up test, consequently it does not have to be activated. However, for certain systems, this test is more complete than the power-up test. For these systems, the procedure may ask the operator to activate this test before executing the AVIONICS STATUS.
 REMARK: As the LAST LEG REPORT and the LAST LEG ECAM REPORT functions are accessible in flight, it is possible to send these two reports to the ground by means of the ACARS so as to allow the mechanic to prepare the necessary spare parts.
 (2) Use of the CFDS in the hangar (main base) It has been seen that the purpose of main base maintenance is to repair faults that it has not been possible to repair at line stops (too long or insufficiently qualified personnel or difficult fault) and class 3 faults. For these repairs the mechanic mainly uses the dialog with the systems, i.e. the functions proper to the systems. Access to these functions is gained by performing 4 consecutive actions on the MCDU:
 -
press the MCDU MENU menu key on the keyboard

 -
press the CFDS line key

 -
press the SYSTEM REPORT/TEST line key

 -
press the key corresponding to the system to be selected.
 This can be done on any MCDU, but only on one at a time. The operator
 then obtains the system menu functions on the MCDU.
 The system selected shall be the system corresponding to the
 unrepaired fault.

 

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 With this menu displayed, the mechanic shall select the following items:
 (a)
 LAST LEG REPORT or TROUBLE SHOOTING DATA The LAST LEG REPORT informs the mechanic of the faults in this system during the last flight. In theory this report enables the mechanic to find the LRU to be replaced. In the case of a fault that is difficult to detect, the TROUBLE SHOOTING DATA report gives him further indications concerning the fault.

 (b)
 TEST When the fault has been repaired, the mechanic executes this function which gives the status of the system (correct or faulty operation) and enables him to check that the repair is effective.

 (c)
 CLASS 3 FAULTS The class 3 faults may be corrected during A Checks (every 400 hours). However, if the mechanic has the time, he can carry out this repair earlier. In order to do this, he must first of all select the AVIONICS STATUS function on the CFDS main menu. This function informs him of the aircraft systems that are affected at that moment by at least one class 3 fault. The mechanic then selects the CLASS 3 FAULTS function of these systems, he obtains the class 3 faults of the selected system which he can then repair. When the fault has been repaired, the mechanic executes the AVIONICS STATUS function again to check that the repair is effective.
　
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