Adjustment of the Stud for Limit-Switch (5MA) of Potable-Water Service-Panel Access-Door (171AL)

TASK 38-13-00-820-801-A
Adjustment of the Stud for Limit-Switch (5MA) of Potable-Water Service-Panel Access-Door (171AL)

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 170

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 2M (6 FT) - ADJUSTABLE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.05BAE1)	Threadlocking Adhesive-- Medium strength -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
170	AFT CAB U/FLOOR COMPT AFT BHD OF BULK
171AL

D. 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)
Stud for Limit-Switch (5MA) of PWSP Access Door (171AL)

3. Job Set-up
Subtask 38-13-00-861-053-A

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 38-13-00-010-053-A

B. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below the Potable-Water Service Panel (PWSP).
(2) Open PWSP access door 171AL.

4. Procedure
Subtask 38-13-00-820-050-A

A. Adjustment of the Stud of Limit Switch 5MA
(1) Loosen the nut (3).
(2) Remove the stud (2) with the nut (3) and the washer (4).
(3) Clean the nut (3), the stud (2) and the washer (4).
(4) Apply Threadlocking Adhesive-- Medium strength - (Material No.05BAE1) to the thread of the stud (2).

NOTE: Refer to the manufacturer's instructions for the drying time of the material No. 05BAE1.

(5) Loosely install the stud (2), the nut (3) and the washer (4).
(6) Carefully close the PWSP access door (1) and listen if you hear a click from limit switch (5).
(a) If you do not hear a click from the limit-switch (5):
1 Open the PWSP access door (1).
2 Turn the stud (2) counterclockwise half a turn.
3 Carefully close the PWSP access door (1).
4 Do the procedure again until you hear a click from the limit-switch (5).
(b) If you hear a click from the limit-switch (5):
1 Open the PWSP access door (1).
2 Turn the stud (2) clockwise half of a turn.
3 Carefully close the PWSP access door (1).
4 Do the procedure again until you do not hear a click from the limit-switch (5).
5 Turn the stud (2) counterclockwise half a turn.
(7) Turn the stud (2) counterclockwise approximately 2 mm (0.079 in.) more.
(8) Hold the stud (2) in position and tighten the nut (3).

Subtask 38-13-00-865-055-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2000VU	WATER SYSTEM-QANT-IND	1MA	B01
** ON A/C NOT FOR ALL
2001VU	WATER SYS-QUANT-IND	1MA	B06

Subtask 38-13-00-710-053-A

C. Operational Test of the Adjustment of the Stud for Limit-Switch (5MA)

ACTION	RESULT
1.At the PWSP:	At the Forward Attendant Panel (FAP) 120RH/miscellaneous panel WATER AND WASTE 124RH:
Close PWSP access door 171AL.	The quantity indication is off.
Open PWSP access door 171AL.	The quantity indication is on.

5. Close-up
Subtask 38-13-00-410-053-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close PWSP access door 171AL.
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(4) Remove the access platform(s).

Subtask 38-13-00-862-053-A

B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 07:19:15 UTC