Removal of the MLG Proximity-Sensors

TASK 32-31-73-000-001-A
Removal of the MLG Proximity-Sensors

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

ZONE: 734
ZONE: 744
FIN: 10GA ** ON A/C NOT FOR ALL
FIN: 11GA ** ON A/C NOT FOR ALL
FIN: 14GA
FIN: 15GA
FIN: 16GA
FIN: 17GA ** ON A/C NOT FOR ALL
FIN: 20GA
FIN: 21GA
FIN: 22GA
FIN: 23GA
FIN: 26GA ** ON A/C NOT FOR ALL
FIN: 27GA ** ON A/C NOT FOR ALL
FIN: 28GA ** ON A/C NOT FOR ALL
FIN: 29GA ** ON A/C NOT FOR ALL
FIN: 32GA ** ON A/C NOT FOR ALL
FIN: 33GA ** ON A/C NOT FOR ALL
FIN: 34GA ** ON A/C NOT FOR ALL
FIN: 35GA ** ON A/C NOT FOR ALL
FIN: 8GA ** ON A/C NOT FOR ALL
FIN: 9GA ** ON A/C NOT FOR ALL

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	SCRAPER - NON METALLIC
No specific	1	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
734	MAIN DOOR
744	MAIN DOOR

C. Referenced Information

REFERENCE	DESIGNATION
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 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
TASK 32-00-00-481-002-A	Installation of the Safety Devices on the Landing Gear Doors
TASK 32-00-00-860-001-A	Flight Configuration Precautions with Electrical Power
TASK 32-00-00-860-001-A-01	Flight Configuration Precautions without Electrical Power
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
MLG Uplock and Door Uplock Proximity-Sensors ** ON A/C NOT FOR ALL
MLG Downlock Proximity-Sensors (System 1)
MLG Downlock Proximity-Sensors (System 2)
MLG Extension Proximity-Sensors (Systems 1 and 2)
MLG Door-Open Proximity-Sensors
MLG Uplock and Door Uplock Proximity-Sensors ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 32-31-73-941-050-A

A. Safety Precautions
(1) Put the SAFETY BARRIER(S) in position.
(2) Install the ground safety locks on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On the panel 400VU:

make sure that the landing-gear control-lever 6GA is in the DOWN position
put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear.

(4) Put a WARNING NOTICE(S) on the GRAVITY GEAR EXTN handle (panel 110VU) to tell persons not to operate the landing gear.

Subtask 32-31-73-010-050-A

B. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the applicable zone 734 or 744.
(2) Open the applicable MLG door (Ref. AMM TASK 32-12-00-010-001).
(3) Make sure that the GROUND LOCK SLEEVE is on the applicable MLG door actuator (Ref. AMM TASK 32-00-00-481-002).

Subtask 32-31-73-869-052-A

C. Flight Configuration Precautions
(1) If the electrical power is not necessary for other maintenance tasks, de-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002). Then, it is not necessary to open the LGCIU circuit breakers.
(2) If the electrical power is necessary, do the precautions for flight configuration (Ref. AMM TASK 32-00-00-860-001) before you open the LGCIU circuit breakers.

Subtask 32-31-73-865-050-A

D. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
** ON A/C NOT FOR ALL
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32
** ON A/C ALL
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
** ON A/C NOT FOR ALL
121VU	LGCIU/BAT SPLY/SYS2	59GA	R32
121VU	LGCIU/BAT SPLY/SYS1	58GA	R31

4. Procedure
Subtask 32-31-73-020-068-D ** ON A/C NOT FOR ALL

A. Removal of the Proximity Sensor

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(1) Remove MLG uplock proximity-sensors 9GA (8GA) and 11GA (10GA) as follows:

MLG Uplock and Door Uplock Proximity-Sensors ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The cap screws (1) and (8)
The washers (2) and (7)
The nuts (5).

(b) Disconnect the electrical connector (6) from the applicable proximity sensor (4).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Remove and discard the lockwire from the capscrews (1).
(e) Identify the positions of the bracket (3), the proximity sensor (4) and the shim (17) before you remove them.
(f) Remove the capscrews (1) and the washers (2). Remove the bracket (3) together with the proximity sensor (4) and the shim (17).
(g) Remove the nuts (5), the capscrews (8) and the washers (7).
(h) Remove the bracket (3) from the proximity sensor (4).
(2) Remove MLG door-uplock proximity-sensors 27GA (26GA) and 29GA (28GA) as follows:

MLG Uplock and Door Uplock Proximity-Sensors ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The capscrews (12) and (13)
The nuts (16)
The washers (11) and (14).

(b) Disconnect the electrical connector (15) from the applicable proximity sensor (9).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Remove and discard the lockwire from the capscrews (12).
(e) Identify the positions of the bracket (10), the proximity sensor (9) and the shim (18) before you remove them.
(f) Remove the capscrews (12) and the washers (11). Remove the bracket (10) together with the proximity sensor (9) and the shim (18).
(g) Remove the nuts (16), the capscrews (13) and the washers (14).
(h) Remove the bracket (10) from the proximity sensor (9).
(3) Remove MLG downlock proximity-sensors 15GA (14GA) as follows:

MLG Downlock Proximity-Sensors (System 1) ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The capscrews (36) and (30)
The nuts (34).

(b) Disconnect the electrical connector (29) from the applicable proximity sensor (37).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Remove and discard the lockwire from the capscrews (36).
(e) Identify the positions of the proximity sensor (37), the target (31) and the spacer (32) if installed, before you remove them.
(f) Remove the capscrews (36) and the proximity sensor (37) from the lockstay.
(g) If it is necessary to remove the target (31), remove:

The nuts (34)
The washers (35)
The capscrews (30)
The target (31)
The spacer (32), if installed.

(4) Remove MLG downlock proximity-sensors 17GA (16GA) as follows:

MLG Downlock Proximity-Sensors (System 2) ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The capscrews (50) and (59)
The nuts (54) and (57).

(b) Disconnect the electrical connector (60) from the applicable proximity sensor (55).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Identify the positions of the proximity sensor (55), the target (51) and the spacer (52) if installed, before you remove them.
(e) Remove the nuts (57), the washers (56), the capscrews (59) and the proximity sensor (55).
(f) If it is necessary to remove the target (51), remove:

The nuts (54)
The washers (53)
The capscrews (50)
The target (51)
The spacer (52), if installed.

(5) Remove MLG extension proximity-sensors 21GA (20GA) as follows:

MLG Extension Proximity-Sensors (Systems 1 and 2) ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The capscrews (71) and (77)
The nuts (75) and (81).

(b) Disconnect the electrical connector (76) from the applicable proximity sensor (73).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Identify the positions of these items, before you remove them:

The proximity sensor (73)
The target (78)
The spacers (72) and (79), if installed.

(e) Remove the nuts (75), the washers (74), the capscrews (71) and the proximity sensor (73). If installed, remove the spacer (72).
(f) If it is necessary to remove the target (78), remove:

The nuts (81)
The washers (80)
The capscrews (77)
The target (78)
The spacer (79), if installed.

(6) Remove MLG extension proximity sensors 23GA (22GA) as follows:

MLG Extension Proximity-Sensors (Systems 1 and 2) ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The capscrews (91) and (93)
The nuts (96) and (97).

(b) Disconnect the electrical connector (100) from the applicable proximity sensor (99).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Identify the positions of these items, before you remove them:

The proximity sensor (99)
The target (92)
The spacers (90) and (94), if installed.

(e) Remove the nuts (97), the washers (98), the capscrews (91) and the proximity sensor (99). If installed, remove the spacer (90).
(f) If it is necessary to remove the target (92), remove:

The nuts (96)
The washers (95)
The capscrews (93)
The target (92)
The spacer (94), if installed.

(7) Remove MLG door-open proximity-sensors 33GA (32GA) and 35GA (34GA) as follows:

MLG Door-Open Proximity-Sensors ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The screws (107) and (113)
The nuts (103) and (111).

(b) Disconnect the electrical connector (106) from the applicable proximity sensor (114).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Identify the positions of the proximity sensor (114), the target (108) and the spacer (109) if installed, before you remove them.
(e) Remove the nuts (103), the washers (104), the screws (113) and the proximity sensor (114).
(f) If it is necessary to remove the target (108), remove:

The nuts (111)
The washers (112)
The screws (107)
The target (108)
The spacer (109), if installed.

Subtask 32-31-73-020-068-E ** ON A/C NOT FOR ALL

A. Removal of the Proximity Sensors

(1) Remove MLG uplock proximity-sensors 9GA (8GA) and 11GA (10GA) as follows:

MLG Uplock and Door Uplock Proximity-Sensors ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The cap screws (1) and (10)
The washers (2) and (9)
The nuts (6).

(b) For MLG uplock proximity-sensor 9GA (8GA):
1 Disconnect the electrical connector (7) from the proximity sensor (4).
(c) For MLG uplock proximity-sensor 11GA (10GA):
1 Disconnect the electrical connector (8) from the proximity sensor (4).
(d) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(e) Remove and discard the lockwire from the cap screws (1).
(f) Before you remove the items that follow, identify their position:

The bracket (3)
The applicable proximity sensor (4)
The shim (5).

(g) Remove the cap screws (1) and the washers (2).
(h) Remove the bracket (3) together with the applicable proximity sensor (4) and the shim (5).
(i) Remove the nuts (6), the washers (9) and the cap screws (10).
(j) Remove the bracket (3) from the applicable proximity sensor (4).
(2) Remove MLG door-uplock proximity-sensors 27GA (26GA) and 29GA (28GA) as follows:

MLG Uplock and Door Uplock Proximity-Sensors ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The cap screws (14), (15), (24), (36) and (40)
The washers (13), (16), (25), (35) and (38)
The nuts (23), (28) and (37).

(b) Disconnect the electrical connector (20) as follows:
1 Remove the nuts (22), the washers (21) and the cap screws (19).
2 Remove the clamp blocks (18) from the switch bracket (17).
3 Disconnect the electrical connector (20) from the proximity sensor (11).
4 Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Disconnect the electrical connector (32) as follows:
1 Remove the nuts (29), the washers (30) and the cap screws (33).
2 Remove the clamp blocks (31) from the switch bracket (34).
3 Disconnect the electrical connector (32) from the proximity sensor (27).
4 Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) To disconnect the switch bracket (17) from the switch bracket (34), remove the items that follow:

The nut (37)
The washer (38)
The capscrew (40)
The shim (39), if installed.

(e) Remove the proximity sensor (11) as follows:
1 Before you remove the items that follow, identify their position:

The switch bracket (17)
The proximity sensor (11)
The shim (12).

2 Remove the cap screws (14) and the washers (13).
3 Remove the switch bracket (17) together with the proximity sensor (11) and the shim (12). Remove the shim (12) from the switch bracket (17).
4 Remove the nuts (23), the cap screws (15) and the washers (16).
5 Remove the proximity sensor (11) from the switch bracket (17).
(f) Remove the proximity sensor (27) as follows:
1 Before you remove the items that follow, identify their position:

The switch bracket (34)
The proximity sensor (27)
The shim (26).

2 Remove the cap screws (24) and the washers (25).
3 Remove the switch bracket (34) together with the proximity sensor (27) and the shim (26). Remove the shim (26) from the switch bracket (34).
4 Remove the nuts (28), the cap screws (36) and the washers (35).
5 Remove the proximity sensor (27) from the switch bracket (34).
(3) Remove MLG downlock proximity-sensor 15GA (14GA) as follows:

MLG Downlock Proximity-Sensors (System 1) ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The cap screws (36) and (30)
The nuts (34).

(b) Disconnect the electrical connector (29) from the proximity sensor (37).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Remove and discard the lockwire from the cap screws (36).
(e) Before you remove the items that follow, identify their position:

The proximity sensor (37)
The target (31)
The spacer (32), if installed.

(f) Remove the cap screws (36) and the proximity sensor (37) from the lockstay.
(g) If it is necessary to remove the target (31), remove the items that follow:

The nuts (34)
The washers (35)
The cap screws (30)
The target (31)
The spacer (32), if installed.

(4) Remove MLG downlock proximity-sensor 17GA (16GA) as follows:

MLG Downlock Proximity-Sensors (System 2) ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The cap screws (50) and (59)
The nuts (54) and (57).

(b) Disconnect the electrical connector (60) from the proximity sensor (55).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Before you remove the items that follow, identify their position:

The proximity sensor (55)
The target (51)
The spacer (52), if installed.

(e) Remove the nuts (57), the washers (56), the cap screws (59) and the proximity sensor (55).
(f) If it is necessary to remove the target (51), remove the items that follow:

The nuts (54)
The washers (53)
The cap screws (50)
The target (51)
The spacer (52), if installed.

(5) Remove MLG extension proximity-sensor 21GA (20GA) as follows:

MLG Extension Proximity-Sensors (Systems 1 and 2) ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The cap screws (71) and (77)
The nuts (75) and (81).

(b) Disconnect the electrical connector (76) from the proximity sensor (73).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Before you remove the items that follow, identify their position:

The proximity sensor (73)
The target (78)
The spacers (72) and (79), if installed.

(e) Remove the nuts (75), the washers (74), the cap screws (71) and the proximity sensor (73). If installed, remove the spacer (72).
(f) If it is necessary to remove the target (78), remove the items that follow:

The nuts (81)
The washers (80)
The cap screws (77)
The target (78)
The spacer (79), if installed.

(6) Remove MLG extension proximity-sensor 23GA (22GA) as follows:

MLG Extension Proximity-Sensors (Systems 1 and 2) ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The cap screws (91) and (93)
The nuts (96) and (97).

(b) Disconnect the electrical connector (100) from the proximity sensor (99).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Before you remove the items that follow, identify their position:

The proximity sensor (99)
The target (92)
The spacers (90) and (94), if installed.

(e) Remove the nuts (97), the washers (98), the cap screws (91) and the proximity sensor (99). If installed, remove the spacer (90).
(f) If it is necessary to remove the target (92), remove the items that follow:

The nuts (96)
The washers (95)
The cap screws (93)
The target (92)
The spacer (94), if installed.

(7) Remove MLG door-open proximity-sensors 33GA (32GA) and 35GA (34GA) as follows:

MLG Door-Open Proximity-Sensors ** ON A/C NOT FOR ALL

(a) Use the SCRAPER - NON METALLIC to remove the sealant from:

The cap screws (107) and (113)
The nuts (103) and (111).

(b) Disconnect the electrical connector (106) from the applicable proximity sensors (114).
(c) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(d) Before you remove the items that follow, identify their position:

The proximity sensor (114)
The target (108)
The spacers (109), if installed.

(e) Remove the nuts (103), the washers (104), the screws (113) and the proximity sensor (114).
(f) If it is necessary to remove the target (108), remove the items that follow:

The nuts (111)
The washers (112)
The screws (107)
The targets (108)
The spacers (109), if installed.

[Rev.10 from 2021] 2026.04.01 00:45:51 UTC