Smoke Detection - Upper and Lower ECAM Display Unit
 Figure 019 (SHEET 1)
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 Smoke Detection - Upper and Lower ECAM Display Unit
 Figure 019 (SHEET 2)
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 Smoke Detection - Upper and Lower ECAM Display Unit
 Figure 019 (SHEET 3)
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 B. Progress of Power-up Test
 (1) Duration: - 30 ms.
 (2) Cockpit repercussions directly linked to power-up test accomplishment (some other repercussions may occur depending on the A/C configuration but these can be disregarded): - none
 C. Results of Power-up Test
 (1) Test pass: - ECAM ELEC page: .generator on line (green line) and parameters available (load, voltage and frequency)
 (2) Test failed: - MASTER CAUTION light comes on and chime sounds, - ECAM warning: .ELEC GEN 1 (2) FAULT or .ELEC APU GEN FAULT - ECAM ELEC page: .generator not on line and XX amber boxed in place of parameters (load, voltage and frequency) associated with the faulty GCU
 NOTE : To de-energize the GCU, select OFF the battery switch____ 
R  **ON A/C 401-499, 
R  A. Description 
R  B. Not Applicable 
R  C. Not Applicable 
R R R  (3) Communication with the GAPCU Ref. 24-41-00 Para.: Communications. 
R R R  (4) Detection of any failures affecting the generating channel (Ref. Para. B.).

R  (5) Identification of the LRU responsible for the failure 
R 
R  (Ref. Para. B.). 
R  (6) Memorization of the information pertaining to the failure in 
R  Non-Volatile Memory (NVM) 
R 
R  The GCU contains a NVM which is implemented on the EEPROM. 
R  The GCU NVM stores data for faults detected by the GCU BITE. 
R  The GCU NVM is structured as other type 1 computers (Ref. 31-32-00, 
R  CFDIU). 
R  D. Description of the Interactive Mode Function 
R 
R  Ref. 24-41-00 (AC External Power Control), Para.: Description of the 
R  interactive mode function. 
R  E. Realization of the BITE/TEST 
R 
R  The GCU has a test initialization and three different types of BITE: 
R  - signature evaluation/monitor, 
R  - isolation, 
R  - maintenance. 
R 
R  The isolation BITE has the highest priority followed by the maintenance 
R  BITE, and then the signature BITE. 
R  (1) Initialization 
R 
R  The test initialization is made at power-up or when the generator 
R  pushbutton switch is cycled and the watchdog has timed out or after a 
R  maintenance BITE. 
R  (2) Signature evaluation BITE (SBITE) 
R 
R  Monitoring is executed as long as the GCU is powered except when the 
R  maintenance BITE or isolation BITE has precedence. 
R  The monitor BITE does not change the contents of any RAM used by the 
R  control and protection software. It does not change the state of any 
R  of the outputs and does not stimulate any sense circuitry. 
R 
R  No maintenance BITE test results in the monitor/signature BITE fault 
R  being written in the NVM. 
R  Once a given fault has been determined an indication of the fault is 
R  written into the NVM.

R  (3) Fault Isolation BITE (IBITE) 
R 
R  In the event of a protective trip, the fault isolation software 
R  determines whether the trip is due to an external fault trip 
R  condition or to a faulty sense circuitry within the controller. 
R 
R  The fault isolation BITE's 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 
　
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