W DOC AIRBUS | TSM A320F

Different Average Static Pressure on the ADIRU 1 and the ADIRU 3

TASK 34-11-00-810-856-A
Different Average Static Pressure on the ADIRU 1 and the ADIRU 3

1. Possible Causes
  • ADM-L STATIC PRESSURE [19FP5]
  • ADM-R STATIC PRESSURE [19FP4]
  • ADM-STBY STATIC PRESSURE [19FP8]
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
ARINC READER
 B. Referenced Information
REFERENCE
DESIGNATION
AMM 34-10-00-170-002
Flushing of the Principal Static Pressure Lines
AMM 34-10-00-170-003
Draining and Flushing of Standby Pneumatic Circuits
AMM 34-10-00-860-002
ADIRS Start Procedure
AMM 34-11-16-000-001
Removal of the Static Probe
AMM 34-11-16-400-002
Installation of the Static Probe
AMM 34-11-17-000-001
Removal of the Air Data Module
AMM 34-11-17-400-001
Installation of the Air Data Module
AMM 34-13-00-790-002
Leak Test of the Principal Static and Total Air Data System
ASM 341301
AMM 34-22-25-170-001
Draining and Flushing of the Standby Static and Standby Total Pressure lines (ISIS)
3. Fault Confirmation
Subtask 34-11-00-710-072-A
A. Test
Not applicable, you cannot confirm this fault on the ground.
4. Fault Isolation
Subtask 34-11-00-810-160-B ** ON A/C NOT FOR ALL
A. If the POST FLIGHT REPORT gives the maintenance message ADIRU1 (1FP1)/ ADIRU3 (1FP3):
  • do a visual check of the static probes.
   (1) If one static probe is damaged :
   (2) If the static probes are not damaged:
  • do the ADIRS start procedure AMM 34-10-00-860-002
  • connect the ARINC READER to the test connector 198VC on the panel 188VU and to the test connector 199VC or the panel 187VU ASM 341301
  • compare the static ADM pressure read on these labels:
    ADIRU 1 199VC ! 19FP5 LABEL 177
    pins GG, HH ! 19FP4 LABEL 176
    !
    ADIRU 3 199VC ! 19FP8 LABEL 245
    pins y, z !

     (a) If one value is different:
     (b) If the values are the same:
  • do the flushing of the static pressure line of the air data module (ADM 4 and ADM 5) AMM 34-10-00-170-002
  • do the draining and flushing of the standby static and standby total pressure line of the air data module AMM 34-10-00-170-003
  • do the leak test of the main air data system (CAPT and F/O) AMM 34-13-00-790-002.
Subtask 34-11-00-810-160-D ** ON A/C NOT FOR ALL
A. If the POST FLIGHT REPORT gives the maintenance message ADIRU1 (1FP1)/ ADIRU3 (1FP3):
  • do a visual check of the static probes.
   (1) If one static probe is damaged :
   (2) If the static probes are not damaged:
  • do the ADIRS start procedure AMM 34-10-00-860-002
  • connect the ARINC READER to the test connector 198VC on the panel 188VU and to the test connector 199VC or the panel 187VU ASM 341301
  • compare the static ADM pressure read on these labels:
    ADIRU 1 199VC ! 19FP5 LABEL 177
    pins GG, HH ! 19FP4 LABEL 176
    !
    ADIRU 3 199VC ! 19FP8 LABEL 245
    pins y, z !

     (a) If one value is different:
     (b) If the values are the same:
  • do the flushing of the static pressure line of the air data module (ADM 4 and ADM 5) AMM 34-10-00-170-002
  • do the draining and flushing of the standby static and standby total pressure line of the air data module AMM 34-22-25-170-001
  • do the leak test of the main air data system (CAPT and F/O) AMM 34-13-00-790-002.
Subtask 34-11-00-810-161-A
B. After the subsequent flight, if the fault continues:
Subtask 34-11-00-810-162-A
C. After the subsequent flight, if the fault continues:
  • replace the ADM-R STATIC PRESSURE [19FP4] .
Subtask 34-11-00-810-163-A
D. After the subsequent flight, if the fault continues:
  • replace the ADM-STBY STATIC PRESSURE [19FP8] .
[Rev.8 from Aug 2018] 2026.04.04 04:32:16 UTC
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