Installation of the Three-Axis-Accelerometer (LA)

TASK 31-33-16-400-001-A
Installation of the Three-Axis-Accelerometer (LA)

NOTE: For a correct function of the three-axis-accelerometer, you must install it exactly in horizontal position. If the adjustment of the three-axis-accelerometer position is necessary (studs were removed), you can do it through the installation of a different numbers of washers.

ZONE: 140
FIN: 6TU

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	Torque wrench: range to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
140	CENTER WING
241JF

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-33-00-710-016-A	Operational Test of the Three-Axis-Accelerometer thru the MCDU
TASK 31-33-00-740-801-A	BITE Test of the Three-Axis-Accelerometer through the MCDU
TASK 53-32-12-000-002-A	Removal of the Cabin Floor Panels
TASK 53-32-12-400-002-A	Installation of the Cabin Floor Panels
Three-Axis-Accelerometer - Removal/Installation

3. Job Set-up
Subtask 31-33-16-860-050-A

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that floor panel 241JF is removed (Ref. AMM TASK 53-32-12-000-002).

Subtask 31-33-16-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	RCDR/ACCLRM	9TU	K18
** ON A/C NOT FOR ALL
121VU	RCDR/ACCLRM	9TU	K41

4. Procedure
Subtask 31-33-16-420-050-B

A. Installation of the Three-Axis Accelerometer
(1) Clean the component interfaces and the adjacent area.
(2) Put the three-axis accelerometer (1) in position.

NOTE: For a correct function of the three-axis-accelerometer (1), you must install it exactly in horizontal position.
If the adjustment of the three-axis-accelerometer position is necessary (the studs (4) were removed), you can do it through the installation of a different number of the washers (5) and (6).

(3) Remove the blanking caps and connect the electrical connector (3) on the three-axis accelerometer (1).

Subtask 31-33-16-865-055-A

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	RCDR/ACCLRM	9TU	K18
** ON A/C NOT FOR ALL
121VU	RCDR/ACCLRM	9TU	K41

Subtask 31-33-16-710-050-B

C. Test
(1) Do the bite test of the three-axis-accelerometer through the MCDU (Ref. AMM TASK 31-33-00-740-801).

NOTE: As an alternative procedure, you can do the operational test of the three-axis-accelerometer via the MCDU (Ref. AMM TASK 31-33-00-710-016).

Subtask 31-33-16-420-051-B

D. Tightening of the Three-Axis Accelerometer
(1) Install the nuts (2).
(2) TORQUE the nuts (2) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

5. Close-up
Subtask 31-33-16-410-050-A

A. Close Access
(1) Install floor panel 241JF (Ref. AMM TASK 53-32-12-400-002).
(2) Make sure that the work area is clean and clear of tools and other items.

Subtask 31-33-16-860-053-A

B. Aircraft Maintenance Configuration
(1) Put the aircraft back to its initial configuration.
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 00:34:54 UTC