W DOC AIRBUS | TSM A320F

DMU Receives No Data from the ADIRU 1-3

TASK 31-36-00-810-820-A
DMU Receives No Data from the ADIRU 1-3

1. Possible Causes
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 31-36-00-710-001
Test of the DMU
AMM 31-36-34-000-001
Removal of the Data Management Unit (DMU)
AMM 31-36-34-400-001
Installation of the Data Management Unit (DMU)
ASM 313701
AMM 34-13-00-740-002
INTERFACE TEST of the ADR
AMM 34-14-00-740-001
Interface Test of the IR
3. Fault Confirmation
Subtask 31-36-00-740-066-A ** ON A/C NOT FOR ALL
A. Do the DMU (1TV) fault monitoring test AMM 31-36-00-710-001.
NOTE: Make sure that the circuit breakers 1TV, 4FP2, 5FP2, 6FP2, 10FP on the panel 121VU and 4FP1, 5FP1 on the panel 49VU and 6FP1 on the panel 105VU are closed during the test.
4. Fault Isolation
Subtask 31-36-00-810-060-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message:

  • NO ADIRU-ADC 1 DATA, or
  • NO ADIRU-ADC 2 DATA, or
  • NO ADIRU-IRS 1 DATA, or
  • NO ADIRU-IRS 2 DATA

   (1) Do the BITE Test of the Air Data/Internal Reference System (ADIRS) AMM 34-13-00-740-002 and AMM 34-14-00-740-001.

     (a) If the test gives a different maintenance message, you can find the related trouble shooting procedure in the applicable Page Block 201.

   (2) If the fault continues:
  • do a check and repair the wiring from the ADIRU-1 [1FP1] or ADIRU-2 [1FP2] to the DMU [1TV] ASM 313701:

    ADIRU 1 Connector AA/5A to DMU Connector AA/1G
    ADIRU 1 Connector AA/5B to DMU Connector AA/1H
    ADIRU 1 Connector AB/5E to DMU Connector AA/7A
    ADIRU 1 Connector AB/6E to DMU Connector AA/7B
    or
    ADIRU 2 Connector AA/7A to DMU Connector AB/1G
    ADIRU 2 Connector AA/7B to DMU Connector AB/1H
    ADIRU 2 Connector AB/10C to DMU Connector AB/7A
    ADIRU 2 Connector AB/11C to DMU Connector AB/7B

   (3) If the fault continues:
Subtask 31-36-00-740-067-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:30:02 UTC
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