Accelerometer Fault

TASK 31-33-00-810-805-A
Accelerometer Fault

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-33-00-710-011	Functional Test of the Three-Axis-Accelerometer
ASM 313301
AMM 31-33-16-000-001	Removal of the Three-Axis-Accelerometer (LA)
AMM 31-33-16-400-001	Installation of the Three-Axis-Accelerometer (LA)
AMM 31-55-34-000-001	Removal of the SDAC
AMM 31-55-34-400-001	Installation of the SDAC

3. Fault Confirmation
Subtask 31-33-00-710-054-A

A. Do the Functional Test of the Three-Axis-Accelerometer (6TU) AMM 31-33-00-710-011.

4. Fault Isolation
Subtask 31-33-00-810-054-A ** ON A/C NOT FOR ALL

A. If the test shows that no acceleration values are provided by the Three-Axis-Accelerometer (6TU):

do a check for 28 VDC at the Three-Axis-Accelerometer (6TU) connectors A/A and A/B ASM 313301.

(1) If there is 28 VDC:

replace the ACCELEROMETER-THREE AXIS [6TU] AMM 31-33-16-000-001 and AMM 31-33-16-400-001.

(2) Do the test given in Para. 3.
(3) If there is no 28 VDC:

do a check of aircraft wiring from the LA (6TU) connector A/A to the CB 9TU
ASM 313301

(a) Repair all the unserviceable wiring and connectors.

(4) Do the test given in Para. 3.

Subtask 31-33-00-810-054-B ** ON A/C NOT FOR ALL

A. If the test shows that no acceleration values are provided by the Three-Axis-Accelerometer (6TU):

do a check for 28 VDC at the Three-Axis-Accelerometer (6TU) connectors A/A and A/B ASM 313301.

(1) If there is 28 VDC:

replace the ACCELEROMETER-THREE AXIS [6TU] AMM 31-33-16-000-001 and AMM 31-33-16-400-001.

NOTE: If on the STATUS page of the system display the message DFDR ACCEL comes into view, a dispatch per MMEL is possible (Ref. MMEL).

(2) Do the test given in Para. 3.
(3) If there is no 28 VDC:

do a check of aircraft wiring from the LA (6TU) connector A/A to the CB 9TU
ASM 313301

(a) Repair all the unserviceable wiring and connectors.

(4) Do the test given in Para. 3.

Subtask 31-33-00-810-065-A

B. If the fault continues:

(1) Do a check of the aircraft wiring from:

the LA (6TU) connector A/C to the SDAC 1 (1WV1) connector 11/C
the LA (6TU) connector A/C to the SDAC 2 (1WV2) connector 11/C
the LA (6TU) connector A/D to the SDAC 1 (1WV1) connector 11/D
the LA (6TU) connector A/D to the SDAC 2 (1WV2) connector 11/D
the LA (6TU) connector A/E to the SDAC 1 (1WV1) connector 11/E
the LA (6TU) connector A/E to the SDAC 2 (1WV2) connector 11/E
the LA (6TU) connector A/F to the SDAC 1 (1WV1) connector 11/F
the LA (6TU) connector A/F to the SDAC 2 (1WV2) connector 11/F
the LA (6TU) connector A/G to the SDAC 1 (1WV1) connector 11/G
the LA (6TU) connector A/G to the SDAC 2 (1WV2) connector 11/G
the LA (6TU) connector A/H to the SDAC 1 (1WV1) connector 11/H
the LA (6TU) connector A/H to the SDAC 2 (1WV2) connector 11/H
ASM 313301

(a) Repair all the unserviceable wiring and connectors.
(2) Do the test given in Para. 3.

Subtask 31-33-00-810-066-A

C. If the fault continues:
(1) Replace the SDAC-1 [1WV1] and/or SDAC-2 [1WV2] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.

Subtask 31-33-00-710-061-A

D. Do the test given in Para. 3.

5. Close-up
Subtask 31-33-00-942-050-A

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.

[Rev.8 from Aug 2018] 2026.04.04 04:30:00 UTC