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R  The GAPCU is able to initiate its own and each GCUs maintenance BITE 
R  when requested by the Centralized Fault Display System (CFDS). 
R  If the GAPCU has lost the communication with a GCU, it generates a 
R  message to the CFDS indicating the failed GCU communication. 
R  (a) Not Applicable 
R  (b) GAPCU 
R  The GAPCU transmits the fault messages in clear English to the 
R  CFDIU (the CFDIU is connected to the GAPCU by a discrete input 
R  and an ARINC 429 output bus). 
R  It is also the interface between the CFDIU and the various 
R  control units (GCU1, GCU2). 
R  The control units are connected to the GAPCU by 1553 serial data 
R  links. 
R  1 Operation in normal mode_ 
R  The GAPCU receives the fault information recorded by the 
R  GCU's, compiles them with its own failures and transmits for 
R  the whole system a list of the failures in clear language and 
R  starting from the most recent. When a failure is identified, 
R  the information is permanently transmitted with the ATA 
R  reference of the LRU or of the faulty circuit up to the 
R  beginning of the next flight. 
R  The CFDIU records all the failures - Class I or II and 
R  internal to the system - transmitted by the GAPCU in flight to

 

R  inscribe them in the aircraft LAST LEG REPORT. The most recent 
R  failure is the first to be displayed on the MCDU. 
R  2 Operation in menu mode_ 
R  See Para 6. (BITE test) 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 a LAST LEG REPORT_
 When pressing the corresponding key (in the SYSTEM
 REPORT/TEST page)
 (Ref. Fig. 007)
 All the class I and II flight and ground failures of the
 current flight are displayed. The MCDU display order is as
 follows:
 - the flight messages (the most recent flight failure
 first),
 - then GND and the ground messages (the most recent ground
 failure first).
 At GPCU power up on the ground, the contents of the
 various NVM's (GCU's and GPCU) for the current flight is
 recovered in the order GPCU, GCU1, GCU2 and APU GCU. All
 the messages (flight and ground) become then ground
 messages.
 b TEST_
 When pressing the corresponding key
 (Ref. Fig. 007)
 a test is generated and taken into account by the GPCU. The
 test request is transmitted by the discrete input signal
 from the CFDIU.
 Test logic:
 - ground signal for 500 ms + or - 10 percent = request for
 test,
 - open circuit = no test.
 NOTE : The test mode is only available on the ground.____
 The GPCU transmits the request for test to the GCU's
 and the test results of all the control units (GCU1,
 GCU2, APU GCU and GPCU) to the CFDIU. When the test
 takes more than 3 seconds the system transmits the
 TEST WAIT message to inform the users that his
 request is being processed.

 

 Reading of Class 3 Faults on MCDU
 Figure 007

 

 The TEST WAIT message remains until the test result is available. The test result is transmitted three times and then the GPCU returns automatically in normal mode.
 NOTE : The results remain displayed on the MCDU display
____ unit until the key adjacent to the RETURN line is pressed.
 The test cannot be initiated in the phases 2 to 8 (see ATA Ref. 31-32-00). In the phase 9, if the test is initiated when one engine or the APU is running, one of the following messages is displayed at the end of the test of the channel concerned:
 --------------------------------------------------------GENERATOR CHANNEL MESSAGE
 RUNNING ---------------------------------------------------------IDG 1 MAIN 1 GCU1 TEST NOT RUN
 IDG 2 MAIN 2 GCU2 TEST NOT RUN
 APU APU GCU APU TEST NOT RUN
 c Class 3 faults
_ When pressing the corresponding key (Ref. Fig. 007) the class III faults occured during the current flight are displayed (see TSM manual).
 C. Automatic Periodic Test As soon as the GPCU is supplied (Aircraft on ground and engines shut down) it will automatically perform the test (GPCU and GCUs) and will store the failure (if any) in the corresponding NVM for transmission through the GPCU to the CFDIU. Moreover, the GPCU will activate the BITE Message discrete. This information is provided to the SDACs via the EGIU1 to be written on the ECAM status page.
　
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