Operational Test of the Quantity Indicating System

TASK 38-13-00-710-001-A
Operational Test of the Quantity Indicating System

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	AR	ACCESS PLATFORM 2M (6 FT)
No specific	1	CART - SERVICING, WATER, POTABLE

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-24-38-680-001-A	Draining of the Potable Water System (with Electrical Power)
TASK 12-24-38-680-002-A	Draining of the Potable Water System (without Electrical Power)
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)

3. Job Set-up
Subtask 38-13-00-861-050-A

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

Subtask 38-13-00-860-050-A

B. Preparation for Test
(1) Put an ACCESS PLATFORM 2M (6 FT) in position below potable-water service door 171AL.
(2) Open potable-water service door 171AL.
(3) Drain the potable water tank (Ref. AMM TASK 12-24-38-680-001) or (Ref. AMM TASK 12-24-38-680-002).
(4) Connect the CART - SERVICING, WATER, POTABLE to the fill connection at service panel 2023VU.

Subtask 38-13-00-865-052-A

C. 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
** ON A/C NOT FOR ALL
2001VU	WATER SYS-DRAIN	1MP	B05
** ON A/C NOT FOR ALL
2001VU	WATER-SYS-DRAIN	1MP	B05

4. Procedure
Subtask 38-13-00-710-050-B ** ON A/C NOT FOR ALL

A. Do this test.

ACTION	RESULT
1.At service panel 2023VU: Put the fill and drain handle to the FILL position.	At service panel 2023VU: Fill/drain valve 16MA opens.
	The overflow-valve control light comes on.
Fill the potable water tank with 50.0 l (13.21 USgal) of water.	Quantity indicator 6MA shows 1/4 full.
	On Forward Attendant Panel (FAP) 120RH/miscellaneous panel WATER AND WASTE 124RH: Quantity indicator shows 25%.
2.At service panel 2023VU: Push and hold door limit switch 5MA.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: There is no indication.
3.At FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: Push and hold the membrane switch 'IND ON'.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 25%.
4.At service panel 2023VU: Fill the potable water tank with 100.0 l (26.42 USgal) of water.	At service panel 2023VU: Quantity indicator 6MA shows 1/2 full.
	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: Quantity indicator shows 50% full.
5.At service panel 2023VU: Push and hold door limit switch 5MA.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: There is no indication.
6.At FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: Push and hold the membrane switch 'IND ON'.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 50%.
7.At service panel 2023VU: Fill the potable water tank with 150.0 l (39.63 USgal) of water.	At service panel 2023VU: Quantity indicator 6MA shows 3/4 full.
	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 75% full.
8.At service panel 2023VU: Push and hold door limit switch 5MA.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: There is no indication.
9.At FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: Push and hold the membrane switch 'IND ON'.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 75%.
10.At service panel 2023VU: Fill the potable water tank with 200 l (52.83 USgal) of water.	At service panel 2023VU: Quantity indicator 6MA shows full. Motorized fill/drain valve 16MA closes. The TANK FULL control light comes on. The overflow-valve control light goes off. The fill and drain handle goes back to the NORMAL position.
	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 100% full.
11.At service panel 2023VU: Push and hold door limit switch 5MA.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: There is no indication.
12.At FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: Push and hold the membrane switch 'IND ON'.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 100%.

Subtask 38-13-00-710-050-D ** ON A/C NOT FOR ALL

A. Do this test.

ACTION	RESULT
1.At service panel 2023VU: Open the Potable Water Service Panel (PWSP) door.	At the Flight Attendant Panel (FAP) 124RH: The SERVICE DOOR OPEN message is shown. No fail messages are shown on the WATER/WASTE page.
2.On the FAP: Push the Water/Waste key to get the WATER/WASTE page.	On the FAP: The WATER/WASTE page comes into view.
3.On the WATER/WASTE page: Close the PWSP door at service panel 2023VU. Push the preselection key on the WATER/WASTE page.	ON the WATER/WASTE page: The preselection key change to green. The PRESELECTED QUANTITY box comes into view.
4.At service panel 2023VU: Turn and pull the fill and drain handle to the FILL Position.	At service panel 2023VU: Motorized fill/overflow/drain valve 8MA opens.
5.On the (FAP, WATER/WASTE page) PRESELECTED QUANTITY box: Push the upper arrow (+) to '25%'.	On the (FAP, WATER/WASTE page) PRESELECTED QUANTITY box: '25%' is shown in the window.
6.At service panel 2023VU: Fill the potable water tank with 50 l (13.21 USgal) of water.	At service panel 2023VU: Motorized fill/overflow/drain valve 8MA closes. The TANK FULL control light comes on. The fill and drain handle goes back to the NORMAL position.
	On the FAP, WATER/WASTE page: '25%' is shown on the PRESELECTED QUANTITY box. '25%' is shown on the potable-water tank symbol.
7.On the (FAP, WATER/WASTE page) PRESELECTED QUANTITY box: Push the upper arrow (+) to '50%'.	On the (FAP, WATER/WASTE page) PRESELECTED QUANTITY box: '50%' is shown in the window.
8.At service panel 2023VU: Turn and pull the fill and drain handle to the FILL position.	At service panel 2023VU: Motorized fill/overflow/drain valve 8MA opens.
9.At service panel 2023VU: Fill the potable water tank with 100 l (26.42 USgal) of water.	At service panel 2023VU: Motorized fill/overflow/drain valve 8MA closes. The TANK FULL control light comes on. The fill and drain handle goes back to the NORMAL position.
	On the FAP, WATER/WASTE page: '50%' is shown on the PRESELECTED QUANTITY box. '50%' is shown on the potable-water tank symbol.
10.On the (FAP, WATER/WASTE page) PRESELECTED QUANTITY box: Push the upper arrow (+) to '75%'.	On the (FAP, WATER/WASTE page) PRESELECTED QUANTITY box: '75%' is shown in the window.
11.At service panel 2023VU: Turn and pull the fill and drain handle to the FILL position.	At service panel 2023VU: Motorized fill/overflow/drain valve 8MA opens.
12.At service panel 2023VU: Fill the potable water tank with 150 l (39.63 USgal) of water.	At service panel 2023VU: Motorized fill/overflow/drain valve 8MA closes. The TANK FULL control light comes on. The fill and drain handle goes back to the NORMAL position.
	On the FAP, WATER/WASTE page: '75%' is shown on the PRESELECTED QUANTITY box. '75%' is shown on the potable-water tank symbol.
13.On the (FAP, WATER/WASTE page) PRESELECTED QUANTITY box: Push the upper arrow (+) to '100%'.	On the (FAP, WATER/WASTE page) PRESELECTED QUANTITY box: '100%' is shown in the window.
14.At service panel 2023VU: Turn and pull the fill and drain handle to the FILL position.	At service panel 2023VU: Motorized fill/overflow/drain valve 8MA opens.
15.At service panel 2023VU: Fill the potable water tank with 200 l (52.83 USgal) of water.	At service panel 2023VU: Motorized fill/overflow/drain 8MA closes. The TANK FULL control light comes on. The fill and drain handle goes back to the NORMAL position.
	On the FAP, WATER/WASTE page: '100%' is shown on the PRESELECTED QUANTITY box. '100%' is shown on the potable-water tank symbol.
16.At service panel 2023VU: Push and hold the door limit switch 5MA.	At service panel 2023VU: The TANK FULL control light goes off.
	At the Flight Attendant Panel (FAP) 124RH: The SERVICE DOOR OPEN message is not shown.

Subtask 38-13-00-710-050-K ** ON A/C NOT FOR ALL

A. Do this test.

ACTION	RESULT
1.At service panel 2023VU: Put the fill and drain handle to the FILL position.	At service panel 2023VU: Fill the potable water tank with 55.0 l (14.53 USgal) of water. Quantity indicator 6MA shows 1/4 full.
	At Forward Attendant Panel (FAP) 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 25% full.
2.At service panel 2023VU: Push and hold door limit switch 5MA.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: There is no indication.
3.At FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: Push and hold the membrane switch 'IND ON'.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 25% full.
4.At service panel 2023VU: Fill the potable water tank with 110.0 l (29.06 USgal) of water.	At service panel 2023VU: Quantity indicator 6MA shows 1/2 full.
	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 50% full.
5.At service panel 2023VU: Push and hold door limit switch 5MA.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: There is no indication.
6.At FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: Push and hold the membrane switch 'IND ON'.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 50% full.
7.At service panel 2023VU: Fill the potable water tank with 165.0 l (43.59 USgal) of water.	At service panel 2023VU: Quantity indicator 6MA shows 3/4 full.
	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 75% full.
8.At service panel 2023VU: Push and hold door limit switch 5MA.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: There is no indication.
9.At FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: Push and hold the membrane switch 'IND ON'.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 75% full.
10.At service panel 2023VU: Fill the potable water tank with 220 l (58.12 USgal) of water.	At service panel 2023VU: Motorized fill/overflow/drain valve 8MA closes. The TANK FULL control light comes on. Quantity indicator 6MA shows full. The fill and drain handle goes back to the NORMAL position.
	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 100% full.
11.At service panel 2023VU: Push and hold door limit switch 5MA.	At service panel 2023VU: The TANK FULL control light goes off.
	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: There is no indication.
12.At FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: Push and hold the membrane switch 'IND ON'.	On FAP 120RH/miscellaneous panel WATER AND WASTE 124RH: The quantity indicator shows 100% full.

Subtask 38-13-00-710-050-P ** ON A/C NOT FOR ALL

A. Test(s)
(1) Do the test that follows:

ACTION	RESULT
1.At service panel 2023VU: Open the Potable Water Service Panel (PWSP) door.	At Flight Attendant Panel (FAP) 120RH: The SERVICE DOOR OPEN message is shown. No fail messages are shown on the WATER/WASTE page.
2.On the FAP: Push the Water/Waste key to get the WATER/WASTE page.	On the FAP: The WATER/WASTE page comes into view.
3.At service panel 2023VU: Turn and pull the fill and drain handle to the FILL position.	At service panel 2023VU: Fill/overflow drain valve 8MA opens. The overflow-valve control light comes on.
4.At service panel 2023VU: Fill the potable water tank with 50 l (13.21 USgal) of water.	At service panel 2023VU: Quantity indicator 6MA shows 1/4 full.
	On the FAP, on the WATER/WASTE page: '25%' is shown on the potable-water tank symbol.
5.At service panel 2023VU: Fill the potable water tank with 100 l (26.42 USgal) of water.	At service panel 2023VU: Quantity indicator 6MA shows 1/2 full.
	On the FAP, on the WATER/WASTE page: '50%' is shown on the potable-water tank symbol.
6.At service panel 2023VU: Fill the potable water tank with 150 l (39.63 USgal) of water.	At service panel 2023VU: Quantity indicator 6MA shows 3/4 full.
	On the FAP, on the WATER/WASTE page: '75%' is shown on the potable-water tank symbol.
7.At service panel 2023VU: Fill the potable water tank with 200 l (52.83 USgal) of water.	At service panel 2023VU: Quantity indicator 6MA shows full. Fill/overflow drain valve 8MA closes. The TANK FULL control light comes on. The overflow-valve control light goes off. The fill and drain handle goes back to the NORMAL position.
	On the FAP, on the WATER/WASTE page: '100%' is shown on the potable-water tank symbol.
8.At service panel 2023VU: Push and hold door limit switch 5MA.	At service panel 2023VU: The TANK FULL control light goes off.
	At FAP 120RH: The SERVICE DOOR OPEN message is not shown.

Subtask 38-13-00-710-050-S ** ON A/C NOT FOR ALL

A. Test(s)
(1) Do the test that follows:

ACTION	RESULT
1.At service panel 2023VU: Open the Potable Water Service Panel (PWSP) door.	At Flight Attendant Panel (FAP) 120RH: The SERVICE DOOR OPEN message is shown. No fail messages are shown on the WATER/WASTE page.
2.On the FAP: Push the Water/Waste key to get the WATER/WASTE page.	On the FAP: The WATER/WASTE page comes into view.
3.At service panel 2023VU: Make sure that the potable water tank is drained.	At service panel 2023VU: The orange 'E' LED on quantity indicator 6MA is on.
	On the FAP, on the WATER/WASTE page: '0%' is shown on the potable-water tank symbol.
4.At service panel 2023VU: Turn and pull the fill/overflow drain handle to the FILL position.	At service panel 2023VU: Fill/overflow drain valve 16MA opens. The overflow-valve control light comes on.
5.At service panel 2023VU: Fill the potable water tank with 50 l (13.21 USgal) of water.	At service panel 2023VU: The blue '1/4' LED on quantity indicator 6MA comes on.
	On the FAP, on the WATER/WASTE page: '25%' is shown on the potable-water tank symbol.
6.At service panel 2023VU: Fill the potable water tank with 100 l (26.42 USgal) of water.	At service panel 2023VU: The blue '1/2' LED on quantity indicator 6MA comes on.
	On the FAP, on the WATER/WASTE page: '50%' is shown on the potable-water tank symbol.
7.At service panel 2023VU: Fill the potable water tank with 150 l (39.63 USgal) of water.	At service panel 2023VU: The blue '3/4' LED on quantity indicator 6MA comes on.
	On the FAP, on the WATER/WASTE page: '75%' is shown on the potable-water tank symbol.
8.At service panel 2023VU: Fill the potable water tank with 200 l (52.83 USgal) of water.	At service panel 2023VU: The blue 'F' LED on quantity indicator 6MA comes on. Fill/overflow drain valve 16MA closes. The TANK FULL control light comes on. The overflow-valve control light goes off. The fill/overflow drain handle goes back to the NORMAL position.
	On the FAP, on the WATER/WASTE page: '100%' is shown on the potable-water tank symbol.
9.At service panel 2023VU: Push and hold door limit switch 5MA.	At service panel 2023VU: The TANK FULL control light goes off.
	At FAP 120RH: The SERVICE DOOR OPEN message is not shown.

Subtask 38-13-00-710-050-T ** ON A/C NOT FOR ALL

A. Test(s)
(1) Do the test that follows:

ACTION	RESULT
1.At service panel 2023VU: Open the Potable Water Service Panel (PWSP) door.	At Flight Attendant Panel (FAP) 120RH: The SERVICE DOOR OPEN message is shown. No fail messages are shown on the WATER/WASTE page.
2.On the FAP: Push the Water/Waste key to get the WATER/WASTE page.	On the FAP: The WATER/WASTE page comes into view.
3.At service panel 2023VU: Make sure that the potable water tank is drained.	At service panel 2023VU: The orange 'E' LED on quantity indicator 6MA is on.
	On the FAP, on the WATER/WASTE page: '0%' is shown on the potable-water tank symbol.
4.At service panel 2023VU: Turn and pull the fill/overflow drain handle to the FILL position.	At service panel 2023VU: Fill/overflow drain valve 8MA opens. The overflow-valve control light comes on.
5.At service panel 2023VU: Fill the potable water tank with 50 l (13.21 USgal) of water.	At service panel 2023VU: The blue '1/4' LED on quantity indicator 6MA comes on.
	On the FAP, on the WATER/WASTE page: '25%' is shown on the potable-water tank symbol.
6.At service panel 2023VU: Fill the potable water tank with 100 l (26.42 USgal) of water.	At service panel 2023VU: The blue '1/2' LED on quantity indicator 6MA comes on.
	On the FAP, on the WATER/WASTE page: '50%' is shown on the potable-water tank symbol.
7.At service panel 2023VU: Fill the potable water tank with 150 l (39.63 USgal) of water.	At service panel 2023VU: The blue '3/4' LED on quantity indicator 6MA comes on.
	On the FAP, on the WATER/WASTE page: '75%' is shown on the potable-water tank symbol.
8.At service panel 2023VU: Fill the potable water tank with 200 l (52.83 USgal) of water.	At service panel 2023VU: The blue 'F' LED on quantity indicator 6MA comes on. Fill/overflow drain valve 8MA closes. The TANK FULL control light comes on. The overflow-valve control light goes off. The fill and drain handle goes back to the NORMAL position.
	On the FAP, on the WATER/WASTE page: '100%' is shown on the potable-water tank symbol.
9.At service panel 2023VU: Push and hold door limit switch 5MA.	At service panel 2023VU: The TANK FULL control light goes off.
	At FAP 120RH: The SERVICE DOOR OPEN message is not shown.

5. Close-up
Subtask 38-13-00-080-050-A

A. Disconnect the CART - SERVICING, WATER, POTABLE at service panel 2023VU.

Subtask 38-13-00-410-050-A

B. Close Access
(1) Close potable-water service door 171AL.
(2) Remove the access platform(s).

Subtask 38-13-00-862-050-A

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

[Rev.10 from 2021] 2026.04.01 06:17:50 UTC