W DOC AIRBUS | TSM A320F

Loss of the ADIRU1 Input Signal from the SFCC

TASK 34-13-00-810-927-A
Loss of the ADIRU1 Input Signal from the SFCC

1. Possible Causes
  • SLAT/FLAP CONTR.COMP. [21CV]
  • ADIRU-1 [1FP1]
  • wiring
  • SLAT/FLAP CONTR.COMP. [22CV]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 31-32-00-810-932-A
Failure of the Discrete Links
AMM 27-50-00-866-008
Extension of the Flaps on the Ground
AMM 27-50-00-866-009
Retraction of the Flaps on the Ground
ASM 275110
AMM 27-51-34-000-001
Removal of the SFCC
AMM 27-51-34-400-001
Installation of the SFCC
AMM 34-12-34-000-001
Removal of the ADIRU
AMM 34-12-34-400-001
Installation of the ADIRU
AMM 34-13-00-740-002
INTERFACE TEST of the ADR
AMM 34-13-00-740-004
Read the CFDIU for the ADR CURRENT STATUS
ASM 341302
3. Fault Confirmation
Subtask 34-13-00-740-237-B
A. Test
   (1) Do the interface test of the ADR (system 1) AMM 34-13-00-740-002.
4. Fault Isolation
Subtask 34-13-00-810-177-B
A. If the test gives the SFCC1(21CV)/SFCC2(22CV)/ ADIRU1 (1FP1) maintenance message:
   (1) Put the aircraft in each of the configurations given below AMM 34-13-00-740-004.
     (a) Retract the flaps to the 0 position AMM 27-50-00-866-009.
  • Do a check of the input discrete statuses with the ADR CURRENT STATUS page of ADIRU1:
    AOA Correction Discrete 1A (Pin AA/2J) = OPN
    AOA Correction Discrete 1B (Pin AA/12F) = OPN
    AOA Correction Discrete 2A (Pin AA/11F) = OPN
    AOA Correction Discrete 2B (Pin AA/14F) = OPN
    SSEC Select 1 Discrete (Pin AA/2H) = OPN
    SSEC Select 2 Discrete (Pin AA/2K) = OPN.
     (b) Extend the flaps to the 1 position AMM 27-50-00-866-008.
  • Do a check of the input discrete statuses with the ADR CURRENT STATUS page of ADIRU1:
    AOA Correction Discrete 1A (Pin AA/2J) = GND
    AOA Correction Discrete 1B (Pin AA/12F) = OPN
    AOA Correction Discrete 2A (Pin AA/11F) = GND
    AOA Correction Discrete 2B (Pin AA/14F) = OPN.
     (c) Extend the flaps to the FULL position AMM 27-50-00-866-008.
  • Do a check of the input discrete statuses with the ADR CURRENT STATUS page of ADIRU1:
    AOA Correction Discrete 1A (Pin AA/2J) = GND
    AOA Correction Discrete 1B (Pin AA/12F) = GND
    AOA Correction Discrete 2A (Pin AA/11F) = GND
    AOA Correction Discrete 2B (Pin AA/14F) = GND
    SSEC Select 1 Discrete (Pin AA/2H) = GND
    SSEC Select 2 Discrete (Pin AA/2K) = GND.
   (2) If one of the statuses related to the AOA correction discrete 1A, 1B or SSEC select 1 discrete is not correct:
     (a) Replace the SLAT/FLAP CONTR.COMP. [21CV] AMM 27-51-34-000-001 and AMM 27-51-34-400-001.
     (b) If the fault continues:
     (c) If the fault continues:
Do a check and repair the wiring between:
  • Pin AA/2J of ADIRU1 (1FP1) and pin AB/10K of SFCC1 (21CV)
  • Pin AA/12F of ADIRU1 (1FP1) and the first terminal block
  • Pin AA/2H of ADIRU1 (1FP1) and the first terminal block ASM 341302.
     (d) If the fault continues:
   (3) If one of the statuses related to the AOA correction discrete 2A, 2B or SSEC select 2 discrete is not correct:
     (a) Replace the SLAT/FLAP CONTR.COMP. [22CV] AMM 27-51-34-000-001 and AMM 27-51-34-400-001.
     (b) If the fault continues:
     (c) If the fault continues:
Do a check and repair the wiring between:
  • Pin AA/11F of ADIRU1 (1FP1) and pin AB/8D of SFCC2 (22CV)
  • Pin AA/14F of ADIRU1 (1FP1) and pin AB/10H of SFCC2 (22CV)
  • Pin AA/2K of ADIRU1 (1FP1) and the first terminal block ASM 341302.
     (d) If the fault continues:
Subtask 34-13-00-740-238-A
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:32:29 UTC
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