Different Angle of Attack Value on the ADIRU 1 and the ADIRU 3

TASK 34-11-00-810-859-A
Different Angle of Attack Value on the ADIRU 1 and the ADIRU 3

1. Possible Causes

SENSOR-ANGLE OF ATTACK, 1 [3FP1]
SENSOR-ANGLE OF ATTACK, 3 [3FP3]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-869-002	Procedure for the Class 3 Fault Reading
AMM 34-11-19-000-001	Removal of the Angle of Attack Sensor
AMM 34-11-19-200-001	Inspection of the Angle-Of-Attack Sensor
AMM 34-11-19-400-001	Installation of the Angle of Attack Sensor

3. Fault Confirmation
Subtask 34-11-00-710-075-A

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

4. Fault Isolation
Subtask 34-11-00-810-170-B

A. If the fault message AOA SENSOR1 (3FP1)/ AOA SENSOR3 (3FP3) is shown on the POST FLIGHT REPORT from ADR 2 or ADR 3, or on the SYSTEM REPORT/TEST page on the MCDU from ADR 1:

do an inspection of the SENSOR-ANGLE OF ATTACK, 1 [3FP1] and SENSOR-ANGLE OF ATTACK, 3 [3FP3] AMM 34-11-19-200-001.

(1) If one angle of attack sensor is damaged:

replace the defective angle of attack sensor AMM 34-11-19-000-001 and AMM 34-11-19-400-001.

(2) If the angle of attack sensors are not damaged:

do the procedure for class 3 faults reading for all three ADRs AMM 31-32-00-869-002.
do the trouble shooting procedure related to the ADR class 3 fault associated to the AOA sensors.

[Rev.8 from Aug 2018] 2026.04.04 04:32:16 UTC