W DOC AIRBUS | TSM A320F

Access to the NAV B/UP Page on the MCDU 1 Inoperative

TASK 22-82-00-810-833-A
Access to the NAV B/UP Page on the MCDU 1 Inoperative

1. Possible Causes
  • wiring from MCDU 1 (3CA1) pin B/30 to the first terminal block
  • wiring from the MCDU 1 (3CA1) pin B/40 to the MCDU 1 (3CA1) pin B/41
  • wiring from MCDU 1 (3CA1) pin B/4 to the first terminal block
  • MCDU-1 [3CA1]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 22-82-12-000-001
Removal of the MCDU
AMM 22-82-12-400-002
Installation of the MCDU
AWM 228407
AMM 24-41-00-861-002
Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002
De-energize the Aircraft Electrical Circuits Supplied from the External Power
3. Fault Confirmation
Subtask 22-82-00-860-078-A ** ON A/C NOT FOR ALL
A. Job Set-up
   (1) Aircraft Maintenance Configuration
     (a) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
Subtask 22-82-00-865-069-A ** ON A/C NOT FOR ALL
B. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAUTO FLT/FMGC/110CA1B02
49VUAUTO FLT/MCDU/111CA1B01
121VUAUTO FLT/FMGC/210CA2M17
121VUAUTO FLT/MCDU/211CA2N20
Subtask 22-82-00-710-112-A ** ON A/C NOT FOR ALL
C. Test
ACTION
RESULT
1.On the MCDU 1:
  • push the MCDU MENU mode key.
  • the MCDU MENU page comes into view.
  • push the line key adjacent to the NAV B/UP indication.
  • the B/UP FPLN page comes into view.
4. Fault Isolation
Subtask 22-82-00-810-091-A ** ON A/C NOT FOR ALL
A. If the NAV B/UP indication is not available:
   (1) Do a check of the wiring from MCDU 1 (3CA1) pin B/30 to the first terminal block AWM 228407.
     (a) If there is a ground signal:
  • remove the ground connection.
     (b) If there is no ground signal:
  • continue the trouble shooting procedure.
   (2) If the fault continues:
  • do a check for continuity of the wiring from the MCDU 1 (3CA1) pin B/40 to the MCDU 1 (3CA1) pin B/41 AWM 228407.
     (a) If there is no continuity:
  • repair the above wiring.
     (b) If there is continuity:
  • continue the trouble shooting procedure.
   (3) If the fault continues:
  • do a check for ground of the wiring from MCDU 1 (3CA1) pin B/4 to the first terminal block AWM 228407.
     (a) If there is no ground signal:
  • repair the above wiring.
     (b) If there is a ground signal:
  • continue the trouble shooting procedure.
   (4) If the fault continues:
Subtask 22-82-00-710-113-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.C.
5. Close-up
Subtask 22-82-00-860-079-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
   (1) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:25:29 UTC
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