DOC AIRBUS | TSM A320FAirspeed Discrepancy on the PFD or on the Standby Airspeed Indicator
TASK 34-11-00-810-870-A
Airspeed Discrepancy on the PFD or on the Standby Airspeed Indicator
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Isolation
Subtask 34-11-00-810-191-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:32:17 UTC
Airspeed Discrepancy on the PFD or on the Standby Airspeed Indicator
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 30-31-00-710-001 | Operational Test of the Probe Ice Protection |
| AMM 30-31-00-720-001 | Functional Check of the Insulation Resistance of the Pitot Probe Heater |
| AMM 34-10-00-170-001 | Flushing of the Principal Total Pressure Lines |
| AMM 34-10-00-170-003 | Draining and Flushing of Standby Pneumatic Circuits |
| AMM 34-11-15-000-001 | Removal of the Pitot Probe |
| AMM 34-11-15-200-001 | Inspection/Check of the Pitot Probe |
| AMM 34-11-15-400-001 | Installation of the Pitot Probe |
| AMM 34-13-00-740-002 | INTERFACE TEST of the ADR |
| AMM 34-13-00-790-002 | Leak Test of the Principal Static and Total Air Data System |
| AMM 34-21-00-790-001 | Low-Range Leak Test of the Standby Pneumatic Circuits |
| AMM 34-22-25-170-001 | Draining and Flushing of the Standby Static and Standby Total Pressure lines (ISIS) |
| AMM 34-22-25-790-001 | Low range Leak Test of the Standby Pneumatic circuits |
Subtask 34-11-00-810-191-A ** ON A/C NOT FOR ALL
A. If there is an airspeed discrepancy:
(1) Do the operational test of the probe ice protection AMM 30-31-00-710-001.
(a) If the test gives a maintenance message, do the trouble shooting procedure related to the maintenance message.
(2) Do the Interface test of the ADR AMM 34-13-00-740-002.
(a) If the test gives a maintenance message, do the trouble shooting procedure related to the maintenance message.
(3) Do a visual check of the pitot probe AMM 34-11-15-200-001 of the related side:
Subtask 34-11-00-810-191-B ** ON A/C NOT FOR ALL (1) Do the operational test of the probe ice protection AMM 30-31-00-710-001.
(a) If the test gives a maintenance message, do the trouble shooting procedure related to the maintenance message.
(2) Do the Interface test of the ADR AMM 34-13-00-740-002.
(a) If the test gives a maintenance message, do the trouble shooting procedure related to the maintenance message.
(3) Do a visual check of the pitot probe AMM 34-11-15-200-001 of the related side:
- the PITOT PROBE 1 (9DA1) if there is a discrepancy on the CAPT PFD
- the PITOT PROBE 2 (9DA2) if there is a discrepancy on the F/O PFD
- the PITOT PROBE 3 (9DA3) if there is a discrepancy on the standby airspeed indicator.
- for the CAPT or F/O total pressure line AMM 34-10-00-170-001
- for the standby total pressure line AMM 34-10-00-170-003.
- for the main air data system AMM 34-13-00-790-002 and repair if necessary
- for the standby air data system AMM 34-21-00-790-001 and repair if necessary.
- if the resistance value is not in the correct range, replace the defective pitot probe (9DA1 or 9DA2 or 9DA3) AMM 34-11-15-000-001 and AMM 34-11-15-400-001.
A. If there is an airspeed discrepancy:
(1) Do the operational test of the probe ice protection AMM 30-31-00-710-001.
(a) If the test gives a maintenance message, do the trouble shooting procedure related to the maintenance message.
(2) Do the Interface test of the ADR AMM 34-13-00-740-002.
(a) If the test gives a maintenance message, do the trouble shooting procedure related to the maintenance message.
(3) Do a visual check of the pitot probe AMM 34-11-15-200-001 of the related side:
(1) Do the operational test of the probe ice protection AMM 30-31-00-710-001.
(a) If the test gives a maintenance message, do the trouble shooting procedure related to the maintenance message.
(2) Do the Interface test of the ADR AMM 34-13-00-740-002.
(a) If the test gives a maintenance message, do the trouble shooting procedure related to the maintenance message.
(3) Do a visual check of the pitot probe AMM 34-11-15-200-001 of the related side:
- the PITOT PROBE 1 (9DA1) if there is a discrepancy on the CAPT PFD
- the PITOT PROBE 2 (9DA2) if there is a discrepancy on the F/O PFD
- the PITOT PROBE 3 (9DA3) if there is a discrepancy on the ISIS indicator.
- for the CAPT or F/O total pressure line AMM 34-10-00-170-001
- for the standby total pressure line AMM 34-22-25-170-001.
- for the main air data system AMM 34-13-00-790-002 and repair if necessary
- for the standby air data system AMM 34-22-25-790-001 and repair if necessary.
- if the resistance value is not in the correct range, replace the defective pitot probe (9DA1 or 9DA2 or 9DA3) AMM 34-11-15-000-001 and AMM 34-11-15-400-001.