W DOC AIRBUS | TSM A320F

Failure of the ABCU

TASK 32-43-00-810-833-A
Failure of the ABCU

1. Possible Causes
  • ABCU [95GG]
  • PRESS XDCR-BRK, YELLOW L [101GG]
  • PRESS XDCR-BRK, YELLOW R [100GG]
  • SERVOVALVE-ALTN BRK, L [97GG]
  • SERVOVALVE-ALTN BRK, R [98GG]
  • MANIFOLD-ALTN BRK, L [2853GM]
  • MANIFOLD-ALTN BRK, R [2852GM]
  • BSCU [10GG]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 29-24-00-863-001
Pressurize the Yellow Hydraulic System with the Electric Pump
AMM 31-32-00-860-009
Procedure to Get Access to the SYSTEM REPORT/TEST/L/G Page
AMM 32-42-34-000-001
Removal of the Braking/Steering Control Unit (BSCU)
AMM 32-42-34-400-001
Installation of the Braking/Steering Control Unit (BSCU)
AMM 32-43-00-710-002
Operational Check to start the Functional Test of the Alternate Braking Automatically (flight simulated)
ASM 324302
ASM 324303
AMM 32-43-32-000-001
Removal of the Alternate-Brake Manifold
AMM 32-43-32-400-001
Installation of the Alternate-Brake Manifold
AMM 32-43-34-000-001
Removal of the Alternate Braking Control Unit (ABCU)
AMM 32-43-34-400-001
Installation of the Alternate Braking Control Unit (ABCU)
AMM 32-43-35-000-001
Removal of the Alternate-Brake Direct Drive Valve
AMM 32-43-35-400-001
Installation of the Alternate-Brake Direct Drive Valve
AMM 32-44-19-000-001
Removal of the Pressure Transducer
AMM 32-44-19-400-001
Installation of the Pressure Transducer
AMM 32-46-00-740-002
BITE Test of the BSCU - Ground Scanning
AMM 32-69-00-860-001
Simulation of Flight (With Aircraft on Ground)
AMM 34-10-00-860-005
ADIRS Stop Procedure
TSM TASK 32-42-00-03
NORMAL BRAKING - TASK SUPPORTING DATA
3. Fault Confirmation
Subtask 32-43-00-740-080-A ** ON A/C NOT FOR ALL
A. Do a check for a message related to the alternate braking system on the Post Flight Report (PFR).
   (1) If the PFR gives maintenance message ABCU (95GG) and the TROUBLE SHOOTING DATA gives fault code 275:
     (a) On panel 400VU, make sure that the landing-gear control lever is set to DOWN.
     (b) Do a reset of the BSCU (10GG):
  • Set the A/SKID & N/W STRG switch to OFF, then to ON.
     (c) On panel 110VU, make sure that PARKING BRK control switch 73GG is set to OFF.
     (d) Pressurize the Yellow hydraulic system AMM 29-24-00-863-001.
     (e) Set PARKING BRK control switch 73GG to ON.
     (f) Do the BITE test of the BSCU (GROUND SCANNING) AMM 32-46-00-740-002.
     (g) Make sure that MCDU shows maintenance message ABCU (95GG) with fault code 275.
     (h) If maintenance message ABCU (95GG) with fault code 275 is shown, go to para.4.A.
   (2) If the PFR gives maintenance message ABCU (95GG) and the TROUBLE SHOOTING DATA gives the fault code 276:
     (a) Go to para.4.B.
   (3) If the PFR gives maintenance message ABCU (95GG) and the TROUBLE SHOOTING DATA gives the fault code 277:
     (a) On panel 400VU, make sure that the landing-gear control lever is set to DOWN.
     (b) Do a reset of the BSCU (10GG):
  • Set the A/SKID & N/W STRG switch to OFF, then to ON.
     (c) On panel 110VU, make sure that the PARKING BRK control switch is set to OFF.
     (d) Do the ADIRS stop procedure AMM 34-10-00-860-005.
     (e) Do the simulation of flight, with the aircraft on the ground AMM 32-69-00-860-001.
     (f) Do the BITE test of the BSCU (GROUND SCANNING) AMM 32-46-00-740-002.
     (g) Make sure that the MCDU shows maintenance message ABCU (95GG) with fault code 277.
     (h) If maintenance message ABCU (95GG) with fault code 277 is shown, go to para.4.A.
   (4) If the PFR gives maintenance message ABCU (95GG) and the TROUBLE SHOOTING DATA gives fault code 1500, 1501, 1510, 1550, 1560, 1570 or 1580:
     (a) Do the operational check to start the functional test of the alternate braking automatically (flight simulated) AMM 32-43-00-710-002.
     (b) Do the BITE test of the BSCU (GROUND SCANNING) AMM 32-46-00-740-002.
     (c) Make sure that the MCDU shows maintenance message ABCU (95GG) with fault code 1500, 1501, 1510, 1550, 1560, 1570 or 1580, and go to para.4.C.
   (5) If the PFR gives maintenance message ABCU (95GG) and the TROUBLE SHOOTING DATA gives fault code 279:
     (a) Open circuit breakers 1GG and 3GG. Then close circuit breaker 1GG first and then 3GG to make sure that you put BSCU CHAN 1 in the active mode.
       1 Do the operational check to start the functional test of the alternate braking automatically (flight simulated) AMM 32-43-00-710-002.
       2 Do the BITE test of the BSCU (Ground Scanning) AMM 32-46-00-740-002.
       3 If the MCDU shows maintenance message ABCU (95GG) with fault code 279, go to step (b).
       4 If the MCDU does not show maintenance message ABCU (95GG) with fault code 279, go to step (c).
     (b) Open circuit breaker 1GG. Then close it to make sure that you put BSCU CHAN 2 in the active mode.
       1 Do steps 3.A.(5).(a).1_ and 3.A.(5).(a).2_ again with BSCU CHAN 2 in the active mode.
       2 If the MCDU shows maintenance message ABCU (95GG) with fault code 279, go to para.4.D.
       3 If the MCDU does not show maintenance message ABCU (95GG) with fault code 279, go to para.4.E.
     (c) Open circuit breaker 1GG. Then close it to make sure that you put BSCU CHAN 2 in the active mode.
       1 Do steps 3.A.(5).(a).1_ and 3.A.(5).(a).2_ again with BSCU CHAN 2 in the active mode.
       2 If the MCDU shows maintenance message ABCU (95GG) with fault code 279, go to para.4.E.
Subtask 32-43-00-740-080-B ** ON A/C NOT FOR ALL
A. Do a check for a message related to the alternate braking system on the Post Flight Report (PFR).
   (1) If the PFR gives maintenance message ABCU (95GG) and the TROUBLE SHOOTING DATA gives fault code 275:
     (a) On panel 400VU, make sure that the landing-gear control lever is set to DOWN.
     (b) Do a reset of the BSCU (10GG):
  • Set the A/SKID & N/W STRG switch to OFF, then to ON.
     (c) On panel 110VU, make sure that PARKING BRK control switch 73GG is set to OFF.
     (d) Pressurize the Yellow hydraulic system AMM 29-24-00-863-001.
     (e) Set PARKING BRK control switch 73GG to ON.
     (f) Do the BITE test of the BSCU (GROUND SCANNING) AMM 32-46-00-740-002.
     (g) Make sure that the MCDU shows maintenance message ABCU (95GG) with fault code 275.
     (h) If maintenance message ABCU (95GG) with fault code 275 is shown, go to para.4.A.
   (2) If the PFR gives maintenance message ABCU (95GG) and the TROUBLE SHOOTING DATA gives fault code 276:
     (a) Go to para.4.B.
   (3) If the PFR gives maintenance message ABCU (95GG) and the TROUBLE SHOOTING DATA gives fault code 277:
     (a) On panel 400VU, make sure that the landing-gear control lever is set to DOWN.
     (b) Do a reset of the BSCU (10GG):
  • Set the A/SKID & N/W STRG switch to OFF, then to ON.
     (c) On panel 110VU, make sure that the PARKING BRK control switch is set to OFF.
     (d) Do the ADIRS stop procedure AMM 34-10-00-860-005.
     (e) Do the simulation of flight, with the aircraft on the ground AMM 32-69-00-860-001.
     (f) Do the BITE test of the BSCU (GROUND SCANNING) AMM 32-46-00-740-002.
     (g) Make sure that the MCDU shows maintenance message ABCU (95GG) with fault code 277.
     (h) If maintenance message ABCU (95GG) with fault code 277 is shown, go to para.4.A.
   (4) If the PFR gives the maintenance message:
  • ABCU(95GG)/BRK ALTN PRESS TRANSDUCER(101GG) and the TROUBLE SHOOTING DATA gives fault code 1500, or
  • ABCU(95GG)/BRK ALTN PRESS TRANSDUCER(100GG) and the TROUBLE SHOOTING DATA gives fault code 1501, or
  • ABCU (95GG) and the TROUBLE SHOOTING DATA gives fault code 1510, 1550, 1560, 1570 or 1580:
     (a) Do the operational check to start the functional test of the alternate braking automatically (flight simulated) AMM 32-43-00-710-002.
     (b) Do the BITE test of the BSCU (GROUND SCANNING) AMM 32-46-00-740-002.
     (c) Make sure that the MCDU shows the maintenance message:
  • ABCU(95GG)/BRK ALTN PRESS TRANSDUCER(101GG) with fault code 1500, or
  • ABCU(95GG)/BRK ALTN PRESS TRANSDUCER(100GG) with fault code 1501, or
  • ABCU (95GG) with fault code 1510, 1550, 1560, 1570 or 1580:
     (d) Go to para.4.C.
   (5) If the PFR gives maintenance message ABCU (95GG) and the TROUBLE SHOOTING DATA gives fault code 279:
     (a) Open circuit breakers 1GG and 3GG. Then close circuit breaker 1GG first, then 3GG to make sure that you put BSCU CHAN 1 in the active mode.
       1 Do the operational check to start the functional test of the alternate braking automatically (flight simulated) AMM 32-43-00-710-002.
       2 Do the BITE test of the BSCU (Ground Scanning) AMM 32-46-00-740-002.
       3 If the MCDU shows maintenance message ABCU (95GG) with fault code 279, go to step (b).
       4 If the MCDU does not show maintenance message ABCU (95GG) with fault code 279, go to step (c).
     (b) Open circuit breaker 1GG. Then close it to make sure that you put BSCU CHAN 2 in the active mode.
       1 Do steps 3.A.(5).(a).1_ and 3.A.(5).(a).2_ again with BSCU CHAN 2 in the active mode.
       2 If the MCDU shows maintenance message ABCU (95GG) with fault code 279, go to para.4.D.
       3 If the MCDU does not show maintenance message ABCU (95GG) with fault code 279, go to para.4.E.
     (c) Open circuit breaker 1GG. Then close it to make sure that you put BSCU CHAN 2 in the active mode.
       1 Do steps 3.A.(5).(a).1_ and 3.A.(5).(a).2_ again with BSCU CHAN 2 in the active mode.
       2 If the MCDU shows maintenance message ABCU (95GG) with fault code 279, go to para.4.E.
4. Fault Isolation
Subtask 32-43-00-810-082-A ** ON A/C NOT FOR ALL
A. If the BITE test of the BSCU (GROUND SCANNING) gives the maintenance message ABCU (95GG) with the fault code 275 or 277:
   (1) Replace the ABCU [95GG] AMM 32-43-34-000-001 AMM 32-43-34-400-001.
   (2) If the fault continues:
  • do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/10C to pin A/Y.
Subtask 32-43-00-810-088-A ** ON A/C NOT FOR ALL
B. If the BITE test of the BSCU (GROUND SCANNING) gives the maintenance message ABCU (95GG) with the fault code 276:
   (1) Replace the ABCU [95GG] AMM 32-43-34-000-001 AMM 32-43-34-400-001.
   (2) If the fault continues:
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/10C to pin A/y ASM 324302.
Subtask 32-43-00-810-089-A ** ON A/C NOT FOR ALL
C. If the BITE test of the BSCU (GROUND SCANNING) gives the maintenance message ABCU (95GG) with the fault code 1500, 1501, 1510, 1550, 1560, 1570 or 1580:
   (1) Pressurize the Yellow hydraulic system AMM 29-24-00-863-001.
   (2) Set the PARKING BRK control switch 73GG to ON.
   (3) On the MCDU, get the SYSTEM REPORT/TEST/L/G page AMM 31-32-00-860-009.
   (4) On the SYSTEM REPORT/TEST/L/G page, push the line key adjacent to the BSCU CHAN 1(2) indication.
   (5) On the BSCU CHAN 1(2) page, push the line key adjacent to the SPECIFIC DATA indication 32-42-00-03 TSM TASK 32-42-00-03.
   (6) On the BSCU CHAN 1(2)/SPECIFIC DATA page, push the line key adjacent to the SYSTEM DATA page.
   (7) Push the line key adjacent to the REFRESH indication.
   (8) Do a check of the Alternate Pressure Transducer Left (APTL) and the Alternate Pressure Transducer Right (APTR) pressure values given in the SYSTEM DATA page 1/3.
   (9) Print the SYSTEM DATA of the BSCU CHAN 1(2) page 1/3.
NOTE: The supply pressure value of the Yellow hydraulic system must be 206 +7 -7 bar (3000 +100 -100 psi).
     (a) For the fault code 1500:
       1 Do a check of the APTL pressure value given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTL pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         b If the APTL pressure value is in the limits:
       2 If the fault continues:
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/6H to pin A/q,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/7H to pin A/r,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/8H to pin A/s,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/9H to pin A/t,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/10H to pin A/u,
  • Do a check and repair the wiring from the LGCIU1(5GA1) to the ABCU(95GG) pin AB/2J to pin A/FF,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/9C to pin A/x ASM 324302 ASM 324303.
     (b) For the fault code 1501:
       1 Do a check of the APTR pressure value given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTR pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         b If the APTR pressure value is in the limits:
       2 If the fault continues:
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/6H to pin A/q,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/7H to pin A/r,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/8H to pin A/s,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/9H to pin A/t,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/10H to pin A/u,
  • Do a check and repair the wiring from the LGCIU1(5GA1) to the ABCU(95GG) pin AB/2J to pin A/FF.
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/8C to pin A/w ASM 324302 ASM 324303.
     (c) For the fault code 1510:
       1 Do a check of the APTL and the APTR pressure values given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTL and the APTR pressure values are less than 30 bar (435.11 psi):
       2 If the fault continues:
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/6H to pin A/q,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/7H to pin A/r,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/8H to pin A/s,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/9H to pin A/t,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/10H to pin A/u,
  • Do a check and repair the wiring from the LGCIU1(5GA1) to the ABCU(95GG) pin AB/2J to pin A/FF,
  • Do a check and repair the wiring from the LGCIU2(5GA2) to the ABCU(95GG) pin AB/4F to pin A/e ASM 324302 ASM 324303.
     (d) For the fault code 1550:
       1 Do a check of the APTL and the APTR pressure values given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTL pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         b If the APTR pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         c If the APTL pressure value is in the limits:
  • Read the trouble shooting data of the fault code 1550, do a check of the APTL pressure value and if it is more than 13 bar (188.55 psi):
    . Replace the SERVOVALVE-ALTN BRK, L [97GG] AMM 32-43-35-000-001 AMM 32-43-35-000-001.
         d If the APTR pressure value is in the limits:
  • Read the trouble shooting data of the fault code 1550, do a check of the APTR pressure value and if it is more than 13 bar (188.55 psi):
    . Replace the SERVOVALVE-ALTN BRK, R [98GG] AMM 32-43-35-000-001 AMM 32-43-35-000-001.
       2 If the fault continues:
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AB/1A to pin A/K,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AB/1B to pin A/L,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AB/3A to pin A/M,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AB/3B to pin A/N,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/1F to pin B/K ASM 324302 ASM 324303.
     (e) For the fault code 1560:
       1 Do a check of the APTL and the APTR pressure values given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTL pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         b If the APTR pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         c If the APTL pressure value is in the limits:
  • Read the trouble shooting data of the fault code 1560, do a check of the APTL pressure value and if it is more than 85 bar (1232.82 psi):
    . Replace the SERVOVALVE-ALTN BRK, L [97GG] AMM 32-43-35-000-001 AMM 32-43-35-400-001.
         d If the APTR pressure value is in the limits:
  • Read the trouble shooting data of the fault code 1560, do a check of the APTR pressure value and if it is more than 85 bar (1232.82 psi):
    . Replace the SERVOVALVE-ALTN BRK, R [98GG] AMM 32-43-35-000-001 AMM 32-43-35-400-001.
     (f) For the fault code 1570:
       1 Do a check of the APTL and the APTR pressure values given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTL pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         b If the APTR pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         c If the APTL pressure value is in the limits:
         d If the APTR pressure value is in the limits:
       2 If the fault continues:
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/6H to pin A/q,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/7H to pin A/r,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/8H to pin A/s,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/9H to pin A/t,
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/10H to pin A/u,
  • Do a check and repair the wiring from the LGCIU1(5GA1) to the ABCU(95GG) pin AB/2J to pin A/FF,
  • Do a check and repair the wiring from the PBSV(102GG) to the ABCU(95GG) pin B/5 to pin A/DD ASM 324302 ASM 324303.
     (g) For the fault code 1580:
       1 Do a check of the APTL and the APTR pressure values given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTL and the APTR pressure values are more than 13 bar (188.55 psi):
       2 If the fault continues:
         a Pressurize the Yellow hydraulic system AMM 29-24-00-863-001.
         b Set the PARKING BRK control switch 73GG to ON.
         c On the MCDU, get the SYSTEM REPORT/TEST/L/G page AMM 31-32-00-860-009.
         d On the SYSTEM REPORT/TEST/L/G page, push the line key adjacent to the BSCU CHAN 1(2) indication.
         e On the BSCU CHAN 1(2) page, push the line key adjacent to the SPECIFIC DATA indication 32-42-00-03 TSM TASK 32-42-00-03.
         f On the BSCU CHAN 1(2)/SPECIFIC DATA page, push the line key adjacent to the SYSTEM DATA page.
         g Push the line key adjacent to the REFRESH indication.
         h Do a check of the APTL and the APTR pressure values given in the SYSTEM DATA page 1/3 printed in step (9).
         i Print the SYSTEM DATA of the BSCU CHAN 1(2) page 1/3.
         j If the APTL pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         k If the APTR pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
Subtask 32-43-00-810-089-B ** ON A/C NOT FOR ALL
C. If the BITE test of the BSCU (GROUND SCANNING) gives the maintenance message:
  • ABCU(95GG)/BRK ALTN PRESS TRANSDUCER(101GG) with the fault code 1500 or
  • ABCU(95GG)/BRK ALTN PRESS TRANSDUCER(100GG) with the fault code 1501 or
  • ABCU (95GG) with the fault code 1510, 1550, 1560, 1570 or 1580:
   (1) Pressurize the Yellow hydraulic system AMM 29-24-00-863-001.
   (2) Set the PARKING BRK control switch 73GG to ON.
   (3) On the MCDU, get the SYSTEM REPORT/TEST/L/G page AMM 31-32-00-860-009.
   (4) On the SYSTEM REPORT/TEST/L/G page, push the line key adjacent to the BSCU CHAN 1(2) indication.
   (5) On the BSCU CHAN 1(2) page, push the line key adjacent to the SPECIFIC DATA indication 32-42-00-03 TSM TASK 32-42-00-03.
   (6) On the BSCU CHAN 1(2)/SPECIFIC DATA page, push the line key adjacent to the SYSTEM DATA page.
   (7) Push the line key adjacent to the REFRESH indication.
   (8) Do a check of the Alternate Pressure Transducer Left (APTL) and the Alternate Pressure Transducer Right (APTR) pressure values given in the SYSTEM DATA page 1/3.
   (9) Print the SYSTEM DATA of the BSCU CHAN 1(2) page 1/3.
NOTE: The supply pressure value of the Yellow hydraulic system must be 206 +7 -7 bar (3000 +100 -100 psi).
     (a) For the fault code 1500:
       1 Do a check of the APTL pressure value given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTL pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         b If the APTL pressure value is in the limits:
     (b) For the fault code 1501:
       1 Do a check of the APTR pressure value given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTR pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         b If the APTR pressure value is in the limits:
     (c) For the fault code 1510:
       1 Do a check of the APTL and the APTR pressure values given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTL and the APTR pressure values are less than 30 bar (435.11 psi):
     (d) For the fault code 1550:
       1 Do a check of the APTL and the APTR pressure values given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTL pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         b If the APTR pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         c If the APTL pressure value is in the limits:
  • Read the trouble shooting data of the fault code 1550, do a check of the APTL pressure value and if it is more than 13 bar (188.55 psi):
    . Replace the SERVOVALVE-ALTN BRK, L [97GG] AMM 32-43-35-000-001 AMM 32-43-35-000-001.
         d If the APTR pressure value is in the limits:
  • Read the trouble shooting data of the fault code 1550, do a check of the APTR pressure value and if it is more than 13 bar (188.55 psi):
    . Replace the SERVOVALVE-ALTN BRK, R [98GG] AMM 32-43-35-000-001 AMM 32-43-35-000-001.
     (e) For the fault code 1560:
       1 Do a check of the APTL and the APTR pressure values given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTL pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         b If the APTR pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         c If the APTL pressure value is in the limits:
  • Read the trouble shooting data of the fault code 1560, do a check of the APTL pressure value and if it is more than 85 bar (1232.82 psi):
    . Replace the SERVOVALVE-ALTN BRK, L [97GG] AMM 32-43-35-000-001 AMM 32-43-35-400-001.
         d If the APTR pressure value is in the limits:
  • Read the trouble shooting data of the fault code 1560, do a check of the APTR pressure value and if it is more than 85 bar (1232.82 psi):
    . Replace the SERVOVALVE-ALTN BRK, R [98GG] AMM 32-43-35-000-001 AMM 32-43-35-400-001.
     (f) For the fault code 1570:
       1 Do a check of the APTL and the APTR pressure values given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTL pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         b If the APTR pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         c If the APTL pressure value is in the limits:
         d If the APTR pressure value is in the limits:
     (g) For the fault code 1580:
       1 Do a check of the APTL and the APTR pressure values given in the SYSTEM DATA page 1/3 printed in step (9).
         a If the APTL and the APTR pressure values are more than 13 bar (188.55 psi):
       2 If the fault continues:
         a Pressurize the Yellow hydraulic system AMM 29-24-00-863-001.
         b Set the PARKING BRK control switch 73GG to ON.
         c On the MCDU, get the SYSTEM REPORT/TEST/L/G page AMM 31-32-00-860-009.
         d On the SYSTEM REPORT/TEST/L/G page, push the line key adjacent to the BSCU CHAN 1(2) indication.
         e On the BSCU CHAN 1(2) page, push the line key adjacent to the SPECIFIC DATA indication 32-42-00-03 TSM TASK 32-42-00-03.
         f On the BSCU CHAN 1(2)/SPECIFIC DATA page, push the line key adjacent to the SYSTEM DATA page.
         g Push the line key adjacent to the REFRESH indication.
         h Do a check of the APTL and the APTR pressure values given in the SYSTEM DATA page 1/3 printed in step (9).
         i Print the SYSTEM DATA of the BSCU CHAN 1(2) page 1/3.
         j If the APTL pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
         k If the APTR pressure value is not equal to 145 +10 -10 bar (2103.05 +145.04 -145.04 psi):
Subtask 32-43-00-810-095-A ** ON A/C NOT FOR ALL
D. If the BITE test of the BSCU (Ground Scanning) gives fault code 279 with BSCU system 1 active and with BSCU system 2 active:
   (1) Replace the ABCU (95GG) AMM 32-43-34-000-001 and AMM 32-43-34-400-001.
   (2) If the fault continues:
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/10C to pin A/Y
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/6H to pin A/q
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/7H to pin A/r
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/8H to pin A/s
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/9H to pin A/t
  • Do a check and repair the wiring from the BSCU(10GG) to the ABCU(95GG) pin AC/10H to pin A/u ASM 324302.
Subtask 32-43-00-810-096-A ** ON A/C NOT FOR ALL
E. If the BITE test of the BSCU (Ground Scanning) gives fault code 279 with one BSCU CHAN when the BSCU is active but does not give the fault code 279 with the other BSCU CHAN when the BSCU is active:
   (1) Replace the BSCU [10GG] AMM 32-42-34-000-001 and AMM 32-42-34-400-001.
Subtask 32-43-00-740-081-A ** ON A/C NOT FOR ALL
F. Do the test given in Para.3.A.
[Rev.8 from Aug 2018] 2026.04.04 04:31:42 UTC
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