Deterioration of the Angle of Attack Sensor 1

TASK 34-11-00-810-892-A
Deterioration of the Angle of Attack Sensor 1

1. Possible Causes

SENSOR-ANGLE OF ATTACK, 1 [3FP1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-11-19-000-001	Removal of the Angle of Attack Sensor
AMM 34-11-19-400-001	Installation of the Angle of Attack Sensor

3. Fault Confirmation
Subtask 34-11-00-710-092-A

A. Test
Not applicable, you cannot confirm this fault on the ground.

4. Fault Isolation
Subtask 34-11-00-810-208-B

A. If the PFR gives the class2 fault message AOA SENSOR1 (3FP1)/ADIRU1 (1FP1) and the logbook gives the maintenance status "ADR1":

Do a visual check of the angle of attack sensor 1 (3FP1).

(1) If the angle of attack sensor 1 (3FP1) is damaged:

Replace the SENSOR-ANGLE OF ATTACK, 1 [3FP1] AMM 34-11-19-000-001 and AMM 34-11-19-400-001.

(2) If the angle of attack sensor 1 (3FP1) is not damaged:

No other action is necessary.

(a) After the subsequent flight, if the fault continues:

Replace the SENSOR-ANGLE OF ATTACK, 1 [3FP1] .

Subtask 34-11-00-810-209-A ** ON A/C NOT FOR ALL

B. If the maintenance message AOA SNSR1 (3FP1)/ADIRU1 (1FP1) is shown on the Ground Scanning report, after the test of the angle-of- attack warning:

no maintenance action is necessary.

NOTE: At the end of the test, on the ADIRS CDU, it is necessary to set the OFF/NAV/ATT selector switch related to the ADIRU1 to OFF for some seconds then to NAV to cancel the messages (fast re-alignment is not sufficient).

Subtask 34-11-00-810-209-D ** ON A/C NOT FOR ALL

B. If the maintenance message AOA SNSR1 (3FP1)/ADIRU1 (1FP1) is shown on the Ground Scanning report, after the test of the angle-of-attack warning:

no maintenance action is necessary.

NOTE: At the end of the test, on the ADIRS MSU, it is necessary to set the OFF/NAV/ATT selector switch related to the ADIRU1 to OFF for some seconds then to NAV to cancel the messages (fast re-alignment is not sufficient)

Subtask 34-11-00-810-209-E ** ON A/C NOT FOR ALL

B. If the maintenance message AOA SENSOR1 (3FP1)/ADIRU1 (1FP1) is shown on the Ground Scanning report, after the test of the angle-of-attack warning:

no maintenance action is necessary.

[Rev.8 from Aug 2018] 2026.04.04 04:32:18 UTC