1EFF : 401-499, 1 24-41-00Page 59 1 1 Aug 01/05 1 1 1CES 1R EPGS - Maintenance Operation : TROUBLE SHOOTING DATA R Figure 013

 1EFF : 401-499, 1 24-41-00Page 60 1 1 Aug 01/05 1 1 1CES 1R EPGS - Maintenance Operation : CLASS 3 FAULTS R Figure 014

 1EFF : 401-499, 1 24-41-00Page 61 1 1 Aug 01/05 1 1 1CES 1

R  EPGS - Maintenance Operation : TEST 
R  Figure 015
 1EFF :  401-499,  1  24-41-00 Page 62 
1  1  Aug 01/05
 1  1
 1CES  1

R  (3) Fault isolation BITE 
R 
R  In the event of a protective trip, the fault isolation software 
R  determines whether the trip is due to external fault trip condition 
R  or due to faulty sense circuitry within the controller. 
R 
R  The fault isolation software stimulates the sense circuitry 
R  associated with the trip which has occurred where appropriate. If the 
R  sense circuitry responds to the stimulus as expected then the fault 
R  is judged to be external to the controller. 
R 
R  The fault isolation BITE primary function is to identify the failed 
R  LRU after a protective trip has occurred. The protective trips are 
R  classified as any fault detected by the controller that will result 
R  in a Power Ready Relay (PRR) trip. After a failure has been detected 
R  and indicated by the protective latch as being true, the 
R  corresponding isolation routine will be executed. 
R  Note that after a protective trip has been isolated (isolation 
R  routine is completed and the fault determined) no further isolation 
R  is executed until the protection latch has been cleared (i.e. the 
R  External Power Switch (EPS) is cycled or a cold start is executed). 
R  (4) Maintenance BITE 
R 
R  The maintenance BITE is initiated upon request from the CFDIU. 
R  (a) Stage 1 - Starting maintenance BITE 
R 
R  All the following conditions must be present for a GAPCU 
R  maintenance BITE procedure to begin: 
R  - a test (maintenance BITE request) signal has been received from 
R  the CFDIU (via the ARINC 429 receiver), 
R  - a flight phase 1 or 10 signal is being received from the CFDIU, 
R  - a null failure monitoring and storage command is being received 
R  from the CFDIU, 
R  - "The aircraft is on the ground" discrete input is present, 
R  - Isolation BITE is not in progress. 
R 
R  If all the conditions are met, the message TEST IN PROGRESS is 
R  generated to the CFDIU and the maintenance BITE procedure 
R  continues with stage 2. 
R 
R  NOTE : The GAPCU returns to the normal mode:____ 
R  - if any of the conditions is not met or, 
R  - if the GAPCU receives a log off command from the CFDIU 
R  or,

R  - a return command is pushed at menu level of the CFDIU 
R  or, 
R  - for any protocol problem with the CFDIU. 
R  (b) Stage 2 - GAPCU control of GCU maintenance BITE 
R 
R  The GAPCU initiates a maintenance BITE sequence in each of the 
R  GCUs by sending a maintenance BITE request signal to each GCU via 
R  its MIL-STD-1553-B communication link. 
R  Once initiated, each GCU is in control of its own maintenance 
R  BITE sequence (on ground and engine not running). At the end of 
R  the maintenance BITE sequence (if done), each GCU leaves the 
R  maintenance BITE and stores the messages or fault codes for 
R  interrogation by the GAPCU. 
R  (c) Stage 3 - GAPCU maintenance BITE sequence 
R 
R  The maintenance BITE sequence terminates by the completion of all 
R  the procedures. All fault codes generated during the GAPCU 
R  maintenance BITE sequence are stored in the GAPCU memory. 
R  NOTE : If all the maintenance BITE tests are completed and no____ 
R  fault codes are generated by any of the units, a TEST OK 
R  message is generated to the CFDIU. 
R  (d) Stage 4 - Message conversion and storage 
R 
R  - All the messages are transmitted to the CFDIU.
　
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