Damping Test (Decoding) Not Possible for the LH and RH Ailerons

TASK 27-10-00-810-841-A
Damping Test (Decoding) Not Possible for the LH and RH Ailerons

1. Possible Causes

SSTU-ROLL CTL, CAPT [4CE1]
SSTU-ROLL CTL, F/O [4CE2]
SERVO CTL-L AILERON, INBD G [33CE1]
SERVO CTL-R AILERON, INBD G [33CE2]
SERVO CTL-L AILERON, OUTBD B [33CE3]
SERVO CTL-R AILERON, OUTBD B [33CE4]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 27-10-00-810-845-A	Damping Test (Decoding) Not Possible for the LH and RH Ailerons (New-Generation Side-Stick Unit)
AMM 27-14-51-000-001	Removal of the Aileron Servo Control
AMM 27-14-51-400-001	Installation of the Aileron Servo Control
AMM 27-92-41-000-002	Removal of the Transducer Units
AMM 27-92-41-400-002	Installation of the Transducer Units
AMM 27-92-41-860-801	Identification of the Side Stick Installed on the Aircraft
AMM 27-96-00-710-007	Operational Test of the Damping Measurement (Aileron)
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)
Decoding Table of the Aileron Damping Test
MCDU-Procedure of the Aileron Damping Test

3. Fault Confirmation
Subtask 27-10-00-860-105-A

A. Side Stick Identification
(1) Do the identification of the side stick installed on the aircraft AMM 27-92-41-860-801.
(a) If a new-generation side-stick unit is installed on the aircraft, refer to the troubleshooting procedure (Ref. TSM TASK 27-10-00-810-845).
(b) If the side stick installed on the aircraft is not a new-generation side-stick unit, continue this procedure.

4. Fault Isolation
Subtask 27-10-00-810-091-A

A. If the AIL TEST NOT POSSIBLE message and a BITE code other than 3F3F are shown on the MCDU for the L and R ailerons:
(1) Do the decoding procedure.

Decoding Table of the Aileron Damping Test

NOTE: The decoding procedure gives the cause of the damping test failure and helps to identify a failure message during the next step (ground scanning).

(2) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.

Identify the failure message related to the cause you found during the decoding procedure, then
Do the related troubleshooting procedure.

NOTE: For example, for fault code 3F1F from ELAC1, the condition of R AIL E1M AVAIL is 0 instead of 1. This means that ELAC1 MON (E1M) detected a failure on the right aileron servo-control (R AIL). It is necessary to find the aileron servo control fault-message detected by ELAC1 in the BITE test of the EFCS (ground scanning).

(3) Do the operational test of the damping measurement (aileron) AMM 27-96-00-710-007.

MCDU-Procedure of the Aileron Damping Test

Subtask 27-10-00-810-092-A

B. If the AIL TEST NOT POSSIBLE message and BITE code 3F3F for ELAC1 and/or ELAC2 are shown on the MCDU:

Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.

(1) If the ground scanning gives a maintenance message related to aileron servo control 33CE1, 33CE2, 33CE3 or 33CE4:

Do the troubleshooting procedure related to this message.

(2) If the ground scanning does not give a maintenance message related to aileron servo control 33CE1, 33CE2, 33CE3 or 33CE4:

Replace the SSTU-ROLL CTL, CAPT [4CE1] AMM 27-92-41-000-002 and AMM 27-92-41-400-002.
Do the operational test of the damping measurement (aileron) AMM 27-96-00-710-007.
MCDU-Procedure of the Aileron Damping Test

(a) If the fault continues:

Replace the SSTU-ROLL CTL, F/O [4CE2] AMM 27-92-41-000-002 and AMM 27-92-41-400-002.
Do the operational test of the damping measurement (aileron) AMM 27-96-00-710-007.
MCDU-Procedure of the Aileron Damping Test

1 If the fault continues:
Replace the defective aileron servo-control:

SERVO CTL-L AILERON, INBD G [33CE1] , SERVO CTL-R AILERON, INBD G [33CE2] , SERVO CTL-L AILERON, OUTBD B [33CE3] or SERVO CTL-R AILERON, OUTBD B [33CE4] AMM 27-14-51-000-001 and AMM 27-14-51-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:27:29 UTC