1. Possible Causes
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 - FMGC-1 (1CA1)

 - FMGC-2 (1CA2)

 - BTC-1 (11XU1)

 - BTC-2 (11XU2)

 - wiring of the PS SPLIT discrete of the FMGC 1 (1CA1)

 - wiring of the PS SPLIT discrete of the FMGC 2 (1CA2)

 - CNTOR-DC NORM BUS 2 SWITCHING (1PC2)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 22-83-34-000-001 Removal of the FMGC (1CA1,1CA2)
 AMM 22-83-34-400-001 Installation of the FMGC (1CA1,1CA2)
 AMM 22-91-00-710-001 Ground Scanning of the AFS
 AMM 24-22-55-000-001 Removal of the Contactors (9XU1, 9XU2, 11XU1, 11XU2)
 AMM 24-22-55-400-002 Installation of the Contactors (9XU1, 9XU2, 11XU1,

 11XU2)
 ASM 22-85/04

 3. Fault Confirmation
__________________
 A. Job set-up
 (1) Aircraft Maintenance Configuration
 (a) On the ELEC panel 35VU, make sure that the AVAIL legend of the EXT PWR pushbutton switch is on.
 B. Test
 (1) Do the Ground Scanning of the AFS (Ref. AMM TASK 22-91-00-710-001).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message AFS : 28V PWR 11XU1:
 - push the line key adjacent to the RETURN indication until the AFS MAIN MENU page comes into view

 - push the line key adjacent to the TROUBLE SHOOTING DATA indication

 - push the line key adjacent to the FG1 COM indication, then FG2 COM indication

 - make sure that there is a snapshot related to an event 7

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞22-83-00∞∞∞∞∞∞∞∞∞∞Page 297
 Aug 01/05R CES

 - if this snapshot is present: . make sure that the second number of the word W2 is equal to one of these values (on the FG1 COM and FG2 COM channels):
 * 4, 5, 6, 7, C, D, E or F.
 (1) If the second number is not equal to 4, 5, 6, 7, C, D, E or F (on the FG1 COM channel only):
 - replace the FMGC-1 (1CA1) (Ref. AMM TASK 22-83-34-000-001) and (Ref. AMM TASK 22-83-34-400-001).
 (a) If the fault continues:
 - do a check for a ground signal at the FMGC 1 (1CA1) pin AB/3B (Ref. ASM 22-85/04).
 1 If there is no ground signal:
_
 - do a check and repair the wiring of the PS SPLIT discrete of the FMGC 1 (1CA1): . from FMGC 1 (1CA1) pin AB/3B to BTC 1 (11XU1) pin B/26 . from BTC 1 (11XU1) pin B/28 to BTC 2 (11XU2) pin B/26 . from BTC 2 (11XU2) pin B/28 to connector (1PC2) pin B/16 . from the ground point to connector (1PC2) pin B/14 (Ref. ASM 22-85/04).
 (2) If the second number is not equal to 4, 5, 6, 7, C, D, E or F (on the FG2 COM channel only):
 - replace the FMGC-2 (1CA2) (Ref. AMM TASK 22-83-34-000-001) and (Ref. AMM TASK 22-83-34-400-001).
 (a) If the fault continues:
 - do a check for a ground signal at FMGC 2 (1CA2) pin AB/3B (Ref. ASM 22-85/04).
 1 If there is no ground signal:
_
 - do a check and repair the wiring of the PS SPLIT discrete of the FMGC 2 (1CA2): . from FMGC 2 (1CA2) pin AB/3B to BTC 1 (11XU1) pin B/30 . from BTC 1 (11XU1) pin B/32 to BTC 2 (11XU2) pin B/30 . from BTC 2 (11XU2) pin B/32 to connector (1PC2) pin B/20 . from the ground point to connector (1PC2) pin B/18 (Ref. ASM 22-85/04).
 (3) If the second number is not equal to 4, 5, 6, 7, C, D, E or F (on the FG1 COM and on the FG2 COM channels):
 - replace the BTC-1 (11XU1) (Ref. AMM TASK 24-22-55-000-001) and (Ref. AMM TASK 24-22-55-400-002).
 (a) If the fault continues:
 - replace the BTC-2 (11XU2) (Ref. AMM TASK 24-22-55-000-001) and (Ref. AMM TASK 24-22-55-400-002).
 1 If the fault continues:
_
 - replace the CNTOR-DC NORM BUS 2 SWITCHING (1PC2).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞22-83-00∞∞∞∞∞∞∞∞∞∞Page 298
 Aug 01/05R CES

 B. Do the test given in Para. 3.

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞22-83-00∞∞∞∞∞∞∞∞∞∞Page 299
 Aug 01/05R
 CES  Loss of the FCU Information on the FMGC 1

 1. Possible Causes
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