ADIRU Law Inoperative in ELAC

TASK 34-13-00-810-996-A
ADIRU Law Inoperative in ELAC

1. Possible Causes

SENSOR-ANGLE OF ATTACK, 1 [3FP1]
SENSOR-ANGLE OF ATTACK, 2 [3FP2]
SENSOR-ANGLE OF ATTACK, 3 [3FP3]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 34-11-00-810-861-A	Different Angle of Attack Value on the three ADIRUs
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)
AMM 34-10-00-710-007	Test of the Angle of Attack Warning
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
AMM 34-13-00-740-002	INTERFACE TEST of the ADR

3. Fault Confirmation
Subtask 34-13-00-710-157-A

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

4. Fault Isolation
Subtask 34-13-00-810-245-A

A. If the POST FLIGHT REPORT gives the maintenance message ADR 1 or ADR 2:
(1) On the panels 23VU and 24VU, reset the EFCS computers with the pushbutton switches (OFF and FAULT legends are off).
(2) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001
(a) If the test is not OK:

do the trouble shooting procedure related to the maintenance message.

(b) If the test is OK:

do a visual check of the SENSOR-ANGLE OF ATTACK, 1 [3FP1] , SENSOR-ANGLE OF ATTACK, 2 [3FP2] and SENSOR-ANGLE OF ATTACK, 3 [3FP3] .

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 Interface test of the ADR AMM 34-13-00-740-002.
do the test of the AOA warning AMM 34-10-00-710-007.

3 If one of these tests is not OK:

do the trouble shooting procedure related to the maintenance message.

4 If all these tests are OK, no other maintenance action is necessary.
(3) After the subsequent flight:

if the fault continues, do this trouble shooting procedure (Ref. TSM TASK 34-11-00-810-861).

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