DOC AIRBUS | AMM A320FDecalcification of Water Tank and Distribution System
TASK 38-10-00-670-802-A
Decalcification of Water Tank and Distribution System
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 38-10-00-861-063-A
Subtask 38-10-00-670-072-A ** ON A/C NOT FOR ALL
Subtask 38-10-00-560-076-A
[Rev.10 from 2021]
2026.04.02 06:25:36 UTC
Decalcification of Water Tank and Distribution System
WARNING:
ALWAYS WEAR RUBBER GLOVES, GOGGLES AND PROTECTIVE CLOTHES WHEN YOU DO THIS TASK.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
WARNING:
DO NOT DO WORK ON THE WASTE WATER SYSTEM AND THE POTABLE WATER SYSTEM AT THE SAME TIME.
THIS WILL PREVENT CONTAMINATION OF THE POTABLE WATER SYSTEM. SUCH CONTAMINATION CAN BE DANGEROUS TO HEALTH.
WARNING:
MAKE SURE THAT THE EQUIPMENT YOU USE FOR THIS PROCEDURE IS CLEAN AND APPROVED FOR THE POTABLE WATER SYSTEM. IF NOT IT CAN CAUSE CONTAMINATION OF THE POTABLE WATER SYSTEM.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 3 | ACCESS PLATFORM 1M(3 FT) |
| No specific | 1 | CONTAINER 100 L(25 USGAL) |
| No specific | 1 | CONTAINER 200 L (53 USGAL) |
| No specific | 1 | CONTAINER 500 L(150 USGAL) |
| No specific | 2 | FLASHLIGHT |
| No specific | 1 | HOSE - VINYL |
| No specific | 2 | MIRROR - INSPECTION, FLEXIBLE |
| No specific | 1 | PUMP - WATER, HIGH PRESSURE |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | 1 | THERMOMETER 50 DEG C (122 DEG F) |
| No specific | AR | WARNING NOTICE(S) |
| 98D38108002000 | 2 | ADAPTER DRAIN MAST |
| REFERENCE | DESIGNATION |
|---|---|
| No specific | citric acid solution - 1% mass |
| No specific | indicator paper (pH range from 1 to 10) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 130 | FWD CARGO COMPT AFT BULKHEAD OF AVNCS COMPT TO FWD PRESSURE BULKHEAD OF WING CENTER BOX |
| 170 | AFT CAB U/FLOOR COMPT AFT BHD OF BULK |
| 190 | BELLY FAIR, AIR CONDITIONING & HYD COMPT |
| 133AL, 171AL | |
| 192NB |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-15-38-613-001-A | Fill the Potable Water Tank System (Aircraft Electrical Power Available) |
| TASK 12-15-38-613-002-A | Fill the Potable Water Tank System (Aircraft Electrical Power not Available) |
| 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 12-31-38-660-001-A | Cold Weather Maintenance - Water/Waste |
| 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 38-10-00-614-001-A | Pressurization of the Potable Water System from a Ground Air Supply |
| TASK 38-10-00-614-002-A | Depressurization of the Potable Water System |
| TASK 38-12-23-920-802-A | Replacement of the Galley Water-Filter Elements |
| TASK 38-12-41-000-001-A | Removal of the Water Faucet |
| TASK 38-12-41-000-006-A | Removal of the Nozzle Assembly |
| TASK 38-12-41-000-006-A-01 | Removal of the Nozzle Assembly |
| TASK 38-12-41-400-001-A | Installation of the Water Faucet |
| TASK 38-12-41-400-006-A | Installation of the Nozzle Assembly |
| TASK 38-12-41-400-006-A-01 | Installation of the Nozzle Assembly |
| TASK 38-41-00-790-002-A | Leak Check of the Air supply System |
| TASK 25-35-00-00 | GALLEY EQUIPMENT - DESCRIPTION AND OPERATION |
| TASK 30-71-00-00 | DRAIN MAST ICE PROTECTION - DESCRIPTION AND OPERATION |
| TASK 38-12-00-00 | DISTRIBUTION - DESCRIPTION AND OPERATION |
Potable-Water Drain / Service PanelsSubtask 38-10-00-861-063-A
A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
Subtask 38-10-00-618-059-A (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
B. Preparation for Cold Weather Conditions
(1) Obey the cold-weather maintenance procedure, if necessary (Ref. AMM TASK 12-31-38-660-001).
Subtask 38-10-00-790-050-A (1) Obey the cold-weather maintenance procedure, if necessary (Ref. AMM TASK 12-31-38-660-001).
C. Leak Test
(1) Do a leak check of the air supply system (Ref. AMM TASK 38-41-00-790-002).
Subtask 38-10-00-680-056-A (1) Do a leak check of the air supply system (Ref. AMM TASK 38-41-00-790-002).
NOTE: Leaks are not permitted.
D. Draining of the Potable Water System
(1) Drain the potable water system (Ref. AMM TASK 12-24-38-680-001).
Subtask 38-10-00-865-077-A (1) Drain the potable water system (Ref. AMM TASK 12-24-38-680-001).
E. Open, safety and tag this(these) circuit breaker(s):
Subtask 38-10-00-010-067-A ** ON A/C NOT FOR ALL | 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 | VACU TOIL SYS-VACUUM-GEN | 33MG | A08 |
| ** ON A/C NOT FOR ALL | |||
| 2001VU | WATER-SYS-DRAIN | 1MP | B05 |
| ** ON A/C NOT FOR ALL | |||
| 2001VU | VACU TOIL SYS-VACU-GEN | 33MG | A08 |
F. Get Access
(1) Get access to the forward drain-panel:
(a) Put an ACCESS PLATFORM 1M(3 FT) below access door 133AL and open it.
(2) Get access to the mid drain-panel:
(a) Put an ACCESS PLATFORM 1M(3 FT) below access door 192NB and open it.
(3) Get access to the Potable-Water Service Panel (PWSP):
(a) Put an ACCESS PLATFORM 1M(3 FT) below access door 171AL and open it.
Subtask 38-10-00-860-057-A ** ON A/C NOT FOR ALL (1) Get access to the forward drain-panel:
(a) Put an ACCESS PLATFORM 1M(3 FT) below access door 133AL and open it.
(2) Get access to the mid drain-panel:
(a) Put an ACCESS PLATFORM 1M(3 FT) below access door 192NB and open it.
(3) Get access to the Potable-Water Service Panel (PWSP):
(a) Put an ACCESS PLATFORM 1M(3 FT) below access door 171AL and open it.
G. Aircraft Maintenance Configuration
(1) On the forward drain panel, make sure that the handle (9) of the drain valve (4) is in the SHUT position.
(2) On the mid drain panel:
(a) Make sure that the handle (6) of the drain valve (5) is in the CLOSED position.
(b) Make sure that the handle (1) of the overflow valve is in the CLOSED position.
(c) Put the CONTAINER 100 L(25 USGAL) in position below the mid drain-panel.
(d) Connect the HOSE - VINYL (3) to the POTABLE WATER OVERFLOW port (2).
(e) Put the other end of the HOSE - VINYL (3) in the CONTAINER 100 L(25 USGAL).
(3) On the PWSP:
(a) Make sure that the handle (10) of the fill/drain valve is in the NORMAL position.
(b) Remove the cap (8) from the fill/drain nipple (7).
(4) Connect the PUMP - WATER, HIGH PRESSURE to the CONTAINER 500 L(150 USGAL) and the fill/drain nipple (7) on the PWSP.
(5) Put the CONTAINER 200 L (53 USGAL) in position below each drain mast (Ref. AMM D/O 30-71-00-00).
(6) Connect the 98D38108002000 ADAPTER DRAIN MAST to each drain mast.
(7) Put the other end of each 98D38108002000 ADAPTER DRAIN MAST in the related CONTAINER 200 L (53 USGAL).
(8) In each lavatory and wet galley (Ref. AMM D/O 38-12-00-00):
(a) Close the manual shut-off valve of the potable water system.
(b) On the water heater, set the power switch to the OFF position:
1 If necessary, use the FLASHLIGHT and the MIRROR - INSPECTION, FLEXIBLE and find the power switch of the water heater.
(c) Make sure that the water faucets are in the middle (mixed) position.
(9) In each wet galley:
(a) Remove the galley water-filter elements (if installed) (Ref. AMM TASK 38-12-23-920-802):
1 If the caps and the filter elements are installed on the galley filter housings, remove them.
2 Do not install the new filter elements at this time.
3 Discard the filter elements.
4 If the caps are removed from the galley filter housings, install them and tighten the clamps.
5 If the canister is installed on the interface, remove it.
6 Do not install a new canister at this time.
7 Install the bypass connector on the interface and tighten it.
(c) Remove the equipment connected to the potable water system:
1 Find all the equipment connected to the potable water system (for example, the coffee maker, the water heater or the steam oven) (Ref. AMM D/O 25-35-00-00).
2 Remove the equipment you found. Refer to the related removal tasks for these components.
3 If necessary, send the components to the workshop to do the disinfection of the removed components and clean them.
Subtask 38-10-00-010-067-B ** ON A/C NOT FOR ALL (1) On the forward drain panel, make sure that the handle (9) of the drain valve (4) is in the SHUT position.
(2) On the mid drain panel:
(a) Make sure that the handle (6) of the drain valve (5) is in the CLOSED position.
(b) Make sure that the handle (1) of the overflow valve is in the CLOSED position.
(c) Put the CONTAINER 100 L(25 USGAL) in position below the mid drain-panel.
(d) Connect the HOSE - VINYL (3) to the POTABLE WATER OVERFLOW port (2).
(e) Put the other end of the HOSE - VINYL (3) in the CONTAINER 100 L(25 USGAL).
(3) On the PWSP:
(a) Make sure that the handle (10) of the fill/drain valve is in the NORMAL position.
(b) Remove the cap (8) from the fill/drain nipple (7).
(4) Connect the PUMP - WATER, HIGH PRESSURE to the CONTAINER 500 L(150 USGAL) and the fill/drain nipple (7) on the PWSP.
(5) Put the CONTAINER 200 L (53 USGAL) in position below each drain mast (Ref. AMM D/O 30-71-00-00).
(6) Connect the 98D38108002000 ADAPTER DRAIN MAST to each drain mast.
(7) Put the other end of each 98D38108002000 ADAPTER DRAIN MAST in the related CONTAINER 200 L (53 USGAL).
(8) In each lavatory and wet galley (Ref. AMM D/O 38-12-00-00):
(a) Close the manual shut-off valve of the potable water system.
(b) On the water heater, set the power switch to the OFF position:
1 If necessary, use the FLASHLIGHT and the MIRROR - INSPECTION, FLEXIBLE and find the power switch of the water heater.
(c) Make sure that the water faucets are in the middle (mixed) position.
(9) In each wet galley:
(a) Remove the galley water-filter elements (if installed) (Ref. AMM TASK 38-12-23-920-802):
1 If the caps and the filter elements are installed on the galley filter housings, remove them.
2 Do not install the new filter elements at this time.
3 Discard the filter elements.
4 If the caps are removed from the galley filter housings, install them and tighten the clamps.
5 If the canister is installed on the interface, remove it.
6 Do not install a new canister at this time.
7 Install the bypass connector on the interface and tighten it.
NOTE: The bypass connector is attached to the interface.
(b) Put the WARNING NOTICE(S) in position to tell persons not to remove the caps or the bypass connector because the decalcification is in progress. (c) Remove the equipment connected to the potable water system:
1 Find all the equipment connected to the potable water system (for example, the coffee maker, the water heater or the steam oven) (Ref. AMM D/O 25-35-00-00).
2 Remove the equipment you found. Refer to the related removal tasks for these components.
3 If necessary, send the components to the workshop to do the disinfection of the removed components and clean them.
H. Get Access
(1) Get access to the forward potable-water drain-panel:
(a) Put an ACCESS PLATFORM 1M(3 FT) below access door 133AL and open it.
(2) Get access to the Potable-Water Service Panel (PWSP):
(a) Put an ACCESS PLATFORM 1M(3 FT) below access door 171AL and open it.
Subtask 38-10-00-860-057-B ** ON A/C NOT FOR ALL (1) Get access to the forward potable-water drain-panel:
(a) Put an ACCESS PLATFORM 1M(3 FT) below access door 133AL and open it.
(2) Get access to the Potable-Water Service Panel (PWSP):
(a) Put an ACCESS PLATFORM 1M(3 FT) below access door 171AL and open it.
I. Aircraft Maintenance Configuration
(1) On the forward drain panel, make sure that the handle (2) of the drain valve (1) is in the SHUT position.
(2) On the PWSP:
(a) Make sure that the handle (3) of the fill/drain valve is in the NORMAL position.
(b) Put the CONTAINER 100 L(25 USGAL) below the PWSP.
(c) Connect the HOSE - VINYL (6) to the POTABLE WATER OVERFLOW port (7).
(d) Put the other end of the HOSE - VINYL (6) in the CONTAINER 100 L(25 USGAL).
(e) Remove the cap (5) from the fill/drain nipple (4).
(3) Connect the PUMP - WATER, HIGH PRESSURE to the CONTAINER 500 L(150 USGAL) and the fill/drain nipple (4) on the PWSP.
(4) Put the CONTAINER 200 L (53 USGAL) in position below each drain mast (Ref. AMM D/O 30-71-00-00).
(5) Connect the 98D38108002000 ADAPTER DRAIN MAST to each drain mast.
(6) Put the other end of each 98D38108002000 ADAPTER DRAIN MAST in the related CONTAINER 200 L (53 USGAL).
(7) In each lavatory and wet galley (Ref. AMM D/O 38-12-00-00):
(a) Close the manual shut-off valve of the potable water system.
(b) On the water heater, set the power switch to the OFF position:
1 If necessary, use the FLASHLIGHT and the MIRROR - INSPECTION, FLEXIBLE and find the power switch of the water heater.
(c) Make sure that the water faucets are in the middle (mixed) position.
(8) In each wet galley:
(a) Remove the galley water-filter elements (if installed) (Ref. AMM TASK 38-12-23-920-802):
1 If the caps and the filter elements are installed on the galley filter housings, remove them.
2 Do not install the new filter elements at this time.
3 Discard the filter elements.
4 If the caps are removed from the galley filter housings, install them and tighten the clamps.
5 If the canister is installed on the interface, remove it.
6 Do not install a new canister at this time.
7 Install the bypass connector on the interface and tighten it.
(c) Remove the equipment connected to the potable water system:
1 Find all the equipment connected to the potable water system (for example, the coffee maker, the water heater or the steam oven) (Ref. AMM D/O 25-35-00-00).
2 Remove the equipment you found. Refer to the related removal tasks for these components.
3 If necessary, send the components to the workshop to do the disinfection of the removed components and clean them.
Subtask 38-10-00-560-077-A (1) On the forward drain panel, make sure that the handle (2) of the drain valve (1) is in the SHUT position.
(2) On the PWSP:
(a) Make sure that the handle (3) of the fill/drain valve is in the NORMAL position.
(b) Put the CONTAINER 100 L(25 USGAL) below the PWSP.
(c) Connect the HOSE - VINYL (6) to the POTABLE WATER OVERFLOW port (7).
(d) Put the other end of the HOSE - VINYL (6) in the CONTAINER 100 L(25 USGAL).
(e) Remove the cap (5) from the fill/drain nipple (4).
(3) Connect the PUMP - WATER, HIGH PRESSURE to the CONTAINER 500 L(150 USGAL) and the fill/drain nipple (4) on the PWSP.
(4) Put the CONTAINER 200 L (53 USGAL) in position below each drain mast (Ref. AMM D/O 30-71-00-00).
(5) Connect the 98D38108002000 ADAPTER DRAIN MAST to each drain mast.
(6) Put the other end of each 98D38108002000 ADAPTER DRAIN MAST in the related CONTAINER 200 L (53 USGAL).
(7) In each lavatory and wet galley (Ref. AMM D/O 38-12-00-00):
(a) Close the manual shut-off valve of the potable water system.
(b) On the water heater, set the power switch to the OFF position:
1 If necessary, use the FLASHLIGHT and the MIRROR - INSPECTION, FLEXIBLE and find the power switch of the water heater.
(c) Make sure that the water faucets are in the middle (mixed) position.
(8) In each wet galley:
(a) Remove the galley water-filter elements (if installed) (Ref. AMM TASK 38-12-23-920-802):
1 If the caps and the filter elements are installed on the galley filter housings, remove them.
2 Do not install the new filter elements at this time.
3 Discard the filter elements.
4 If the caps are removed from the galley filter housings, install them and tighten the clamps.
5 If the canister is installed on the interface, remove it.
6 Do not install a new canister at this time.
7 Install the bypass connector on the interface and tighten it.
NOTE: The bypass connector is attached to the interface.
(b) Put the WARNING NOTICE(S) in position to tell persons not to remove the caps or the bypass connector because the decalcification is in progress. (c) Remove the equipment connected to the potable water system:
1 Find all the equipment connected to the potable water system (for example, the coffee maker, the water heater or the steam oven) (Ref. AMM D/O 25-35-00-00).
2 Remove the equipment you found. Refer to the related removal tasks for these components.
3 If necessary, send the components to the workshop to do the disinfection of the removed components and clean them.
J. Preparation of the Decalcification Solution
(1) Prepare 250 l (66.0 USgal) of decalcification solution ( citric acid solution - 1% mass) in the CONTAINER 500 L(150 USGAL) that is connected to the PUMP - WATER, HIGH PRESSURE.
(2) Use a THERMOMETER 50 DEG C (122 DEG F) to make sure that the temperature of the decalcification solution is not more than 40 deg.C (104.0 deg.F).
Subtask 38-10-00-941-063-A (1) Prepare 250 l (66.0 USgal) of decalcification solution ( citric acid solution - 1% mass) in the CONTAINER 500 L(150 USGAL) that is connected to the PUMP - WATER, HIGH PRESSURE.
(2) Use a THERMOMETER 50 DEG C (122 DEG F) to make sure that the temperature of the decalcification solution is not more than 40 deg.C (104.0 deg.F).
NOTE: The warm decalcification solution increases the speed of the decalcification procedure.
K. Safety Precautions
(1) Put the WARNING NOTICE(S) in position in each lavatory and wet galley to tell persons not to use the potable water system because the decalcification is in progress.
(2) Open the door of each lavatory to get a sufficient airflow.
(3) Put the WARNING NOTICE(S) in position on each lavatory door to tell persons not to close it.
4. Procedure(1) Put the WARNING NOTICE(S) in position in each lavatory and wet galley to tell persons not to use the potable water system because the decalcification is in progress.
(2) Open the door of each lavatory to get a sufficient airflow.
(3) Put the WARNING NOTICE(S) in position on each lavatory door to tell persons not to close it.
Subtask 38-10-00-670-072-A ** ON A/C NOT FOR ALL
A. Decalcification of the Potable-Water Distribution System
(3) On the PWSP:
(a) Turn the handle (10) from the NORMAL to the PULL TO FILL position.
(b) Pull the handle (10) out to the mechanical stop.
(4) Start the PUMP - WATER, HIGH PRESSURE to fill the potable water tank with the decalcification solution.
(5) When the decalcification solution starts to flow out of the POTABLE WATER OVERFLOW port, stop the PUMP - WATER, HIGH PRESSURE.
(6) On the mid drain-panel, turn the handle (1) of the overflow valve to the CLOSED position.
(7) On the PWSP, push the handle (10) and turn it to the NORMAL position to close the fill/drain valve.
(8) Pressurize the potable water system (Ref. AMM TASK 38-10-00-614-001).
(9) Bleed the potable water system:
(a) In each lavatory:
1 Open the manual shut-off valve.
2 Flush the toilet 15 times.
3 Set the water faucet to the cold position and let 3 l (0.8 USgal) of the decalcification solution flow through the wash-basin.
4 Set the water faucet to the hot position and let 3 l (0.8 USgal) of the decalcification solution flow through the wash-basin.
(b) In each wet galley:
1 Open the manual shut-off valve.
2 If installed, open the water faucet and let 5 l (1.3 USgal) of the decalcification solution flow through the sink.
(10) In the most forward and the most aft lavatory/wet galley do a check of the pH value of the decalcification solution. Use indicator paper (pH range from 1 to 10):
(a) Open the water faucet.
(b) Carefully let the decalcification solution flow over the indicator paper.
(c) If the test shows that the pH value is more than 2.5 do the steps 4.A.(9) and 4.A.(10) again.
(11) Carefully disconnect the hose from the fill/drain nipple (4).
(13) Drain the potable water system (Ref. AMM TASK 12-24-38-680-002).
Subtask 38-10-00-670-072-B ** ON A/C NOT FOR ALL WARNING:
BEFORE YOU USE THE DECALCIFICATION SOLUTION, OBEY THESE PRECAUTIONS:
(1) Make sure that the potable water system is depressurized (Ref. AMM TASK 38-10-00-614-002). - PUT ON GLOVES, PROTECTIVE CLOTHING AND GOGGLES.
- MAKE SURE THAT THE NOZZLE ASSEMBLY IS CORRECTLY INSTALLED ON THE FAUCET. IF IT IS INCORRECTLY INSTALLED, THE SOLUTION CAN FLOW OUT HORIZONTALLY.
- PUT A GUARD AROUND THE FAUCET TO KEEP THE SPRAY FROM THE SOLUTION IN THE WASHBASIN AND AWAY FROM ADJACENT SURFACES.
NOTE: If the potable water system is depressurized, the decalcification solution can flow out of the POTABLE WATER OVERFLOW port on the mid drain-panel when the potable water tank is filled.
(2) On the mid drain-panel, turn the handle (1) to the OPEN position to open the overflow valve. (3) On the PWSP:
(a) Turn the handle (10) from the NORMAL to the PULL TO FILL position.
(b) Pull the handle (10) out to the mechanical stop.
(4) Start the PUMP - WATER, HIGH PRESSURE to fill the potable water tank with the decalcification solution.
(5) When the decalcification solution starts to flow out of the POTABLE WATER OVERFLOW port, stop the PUMP - WATER, HIGH PRESSURE.
(6) On the mid drain-panel, turn the handle (1) of the overflow valve to the CLOSED position.
(7) On the PWSP, push the handle (10) and turn it to the NORMAL position to close the fill/drain valve.
(8) Pressurize the potable water system (Ref. AMM TASK 38-10-00-614-001).
(9) Bleed the potable water system:
(a) In each lavatory:
1 Open the manual shut-off valve.
2 Flush the toilet 15 times.
3 Set the water faucet to the cold position and let 3 l (0.8 USgal) of the decalcification solution flow through the wash-basin.
4 Set the water faucet to the hot position and let 3 l (0.8 USgal) of the decalcification solution flow through the wash-basin.
(b) In each wet galley:
1 Open the manual shut-off valve.
2 If installed, open the water faucet and let 5 l (1.3 USgal) of the decalcification solution flow through the sink.
(10) In the most forward and the most aft lavatory/wet galley do a check of the pH value of the decalcification solution. Use indicator paper (pH range from 1 to 10):
(a) Open the water faucet.
(b) Carefully let the decalcification solution flow over the indicator paper.
(c) If the test shows that the pH value is more than 2.5 do the steps 4.A.(9) and 4.A.(10) again.
(11) Carefully disconnect the hose from the fill/drain nipple (4).
NOTE: It is possible that the hose is filled with decalcification solution.
(12) If the hose is filled with decalcification solution, drain the hose into the CONTAINER 500 L(150 USGAL). (13) Drain the potable water system (Ref. AMM TASK 12-24-38-680-002).
A. Decalcification of the Potable-Water Distribution System
(a) Turn the handle (3) from the NORMAL to the PULL TO FILL position.
(b) Pull the handle (3) out to the mechanical stop.
(3) Start the PUMP - WATER, HIGH PRESSURE to fill the potable water tank with the decalcification solution.
(4) When the decalcification solution starts to flow out of the POTABLE WATER OVERFLOW port, stop the PUMP - WATER, HIGH PRESSURE.
(5) On the PWSP, push the handle (3) and turn it to the NORMAL position to close the fill/drain valve.
(6) Pressurize the potable water system (Ref. AMM TASK 38-10-00-614-001).
(7) Bleed the potable water system:
(a) In each lavatory:
1 Open the manual shut-off valve.
2 Flush the toilet 15 times.
3 Set the water faucet to the cold position and let 3 l (0.8 USgal) of the decalcification solution flow through the wash-basin.
4 Set the water faucet to the hot position and let 3 l (0.8 USgal) of the decalcification solution flow through the wash-basin.
(b) In each wet galley:
1 Open the manual shut-off valve.
2 If installed, open the water faucet and let 5 l (1.3 USgal) of the decalcification solution flow through the sink.
(8) In the most forward and the most aft lavatory/wet galley do a check of the pH value of the decalcification solution. Use indicator paper (pH range from 1 to 10):
(a) Open the water faucet.
(b) Carefully let the decalcification solution flow over the indicator paper.
(c) If the test shows that the pH value is more than 2.5 do the steps 4.A.(7) and 4.A.(8) again.
(9) Carefully disconnect the hose from the fill/drain nipple (4).
(11) Drain the potable water system (Ref. AMM TASK 12-24-38-680-002).
Subtask 38-10-00-790-051-A WARNING:
BEFORE YOU USE THE DECALCIFICATION SOLUTION, OBEY THESE PRECAUTIONS:
(1) Make sure that the potable water system is depressurized (Ref. AMM TASK 38-10-00-614-002). - PUT ON GLOVES, PROTECTIVE CLOTHING AND GOGGLES.
- MAKE SURE THAT THE NOZZLE ASSEMBLY IS CORRECTLY INSTALLED ON THE FAUCET. IF IT IS INCORRECTLY INSTALLED, THE SOLUTION CAN FLOW OUT HORIZONTALLY.
- PUT A GUARD AROUND THE FAUCET TO KEEP THE SPRAY FROM THE SOLUTION IN THE WASHBASIN AND AWAY FROM ADJACENT SURFACES.
NOTE: If the potable water system is depressurized, the decalcification solution can flow out of the POTABLE WATER OVERFLOW port on the mid drain-panel when the potable water tank is filled.
(2) On the PWSP: (a) Turn the handle (3) from the NORMAL to the PULL TO FILL position.
(b) Pull the handle (3) out to the mechanical stop.
(3) Start the PUMP - WATER, HIGH PRESSURE to fill the potable water tank with the decalcification solution.
(4) When the decalcification solution starts to flow out of the POTABLE WATER OVERFLOW port, stop the PUMP - WATER, HIGH PRESSURE.
(5) On the PWSP, push the handle (3) and turn it to the NORMAL position to close the fill/drain valve.
(6) Pressurize the potable water system (Ref. AMM TASK 38-10-00-614-001).
(7) Bleed the potable water system:
(a) In each lavatory:
1 Open the manual shut-off valve.
2 Flush the toilet 15 times.
3 Set the water faucet to the cold position and let 3 l (0.8 USgal) of the decalcification solution flow through the wash-basin.
4 Set the water faucet to the hot position and let 3 l (0.8 USgal) of the decalcification solution flow through the wash-basin.
(b) In each wet galley:
1 Open the manual shut-off valve.
2 If installed, open the water faucet and let 5 l (1.3 USgal) of the decalcification solution flow through the sink.
(8) In the most forward and the most aft lavatory/wet galley do a check of the pH value of the decalcification solution. Use indicator paper (pH range from 1 to 10):
(a) Open the water faucet.
(b) Carefully let the decalcification solution flow over the indicator paper.
(c) If the test shows that the pH value is more than 2.5 do the steps 4.A.(7) and 4.A.(8) again.
(9) Carefully disconnect the hose from the fill/drain nipple (4).
NOTE: It is possible that the hose is filled with decalcification solution.
(10) If the hose is filled with decalcification solution, drain the hose into the CONTAINER 500 L(150 USGAL). (11) Drain the potable water system (Ref. AMM TASK 12-24-38-680-002).
B. Leak Test
(1) Do a leak check of the air supply system (Ref. AMM TASK 38-41-00-790-002).
Subtask 38-10-00-170-057-A (1) Do a leak check of the air supply system (Ref. AMM TASK 38-41-00-790-002).
NOTE: Leaks are not permitted.
C. Flush the Potable Water System (after decalcification)
(2) Pressurize the potable water system (Ref. AMM TASK 38-10-00-614-001).
(3) Operate the water faucet in the lavatories and the galleys to flush them:
(a) In the lavatories:
1 Flush the toilet 15 times.
2 Set each water faucet to the COLD position and fill the wash basin with water to the overflow level (approximately 5 l (1.3 USgal)).
3 Remove the water from the wash-basin.
4 Set each water faucet to the HOT position and do the procedure again.
(b) In each wet galley:
1 If a water faucet is installed, open the water faucet and let 5 l (1.3 USgal) of water flow through the sink.
(4) If the water flow out of the lavatory faucet is not sufficient:
(a) Remove and clean the nozzle assembly (Ref. AMM TASK 38-12-41-000-006).
(b) Install the nozzle assembly and operate the faucet (Ref. AMM TASK 38-12-41-400-006).
(c) If the water flow is not sufficient, remove the water faucet filters (Ref. AMM TASK 38-12-41-000-001).
(d) Send the water faucet filters to the workshop to clean them.
(e) Install the water faucet filters and operate the water faucet (Ref. AMM TASK 38-12-41-400-001).
Subtask 38-10-00-670-073-A NOTE: It is necessary to do this procedure two times.
(1) Fill the potable water system with clean water (Ref. AMM TASK 12-15-38-613-002). (2) Pressurize the potable water system (Ref. AMM TASK 38-10-00-614-001).
(3) Operate the water faucet in the lavatories and the galleys to flush them:
(a) In the lavatories:
1 Flush the toilet 15 times.
2 Set each water faucet to the COLD position and fill the wash basin with water to the overflow level (approximately 5 l (1.3 USgal)).
3 Remove the water from the wash-basin.
4 Set each water faucet to the HOT position and do the procedure again.
(b) In each wet galley:
1 If a water faucet is installed, open the water faucet and let 5 l (1.3 USgal) of water flow through the sink.
(4) If the water flow out of the lavatory faucet is not sufficient:
(a) Remove and clean the nozzle assembly (Ref. AMM TASK 38-12-41-000-006).
(b) Install the nozzle assembly and operate the faucet (Ref. AMM TASK 38-12-41-400-006).
(c) If the water flow is not sufficient, remove the water faucet filters (Ref. AMM TASK 38-12-41-000-001).
(d) Send the water faucet filters to the workshop to clean them.
(e) Install the water faucet filters and operate the water faucet (Ref. AMM TASK 38-12-41-400-001).
D. Test for the Remaining Decalcification Solution
(1) Examine the potable water in each galley and lavatory for remaining decalcification solution. Do the test with indicator paper (pH range from 1 to 10). Refer to manufacturer's instructions.
(a) Carefully let the water flow over the indicator paper at the water faucets in the galleys and lavatories.
(2) If the test shows that the pH value is not within a range of 6.5 to 9.5, flush the system again. If there are other limits given by the national health authority for drinking water, refer to them.
(3) Drain the potable water system (Ref. AMM TASK 12-24-38-680-002).
5. Close-up(1) Examine the potable water in each galley and lavatory for remaining decalcification solution. Do the test with indicator paper (pH range from 1 to 10). Refer to manufacturer's instructions.
(a) Carefully let the water flow over the indicator paper at the water faucets in the galleys and lavatories.
(2) If the test shows that the pH value is not within a range of 6.5 to 9.5, flush the system again. If there are other limits given by the national health authority for drinking water, refer to them.
(3) Drain the potable water system (Ref. AMM TASK 12-24-38-680-002).
Subtask 38-10-00-560-076-A
A. Installation of the Filter Elements and the Galley Equipment (after Decalcification of the Potable Water System)
(1) Install the galley water-filter elements (if removed) (Ref. AMM TASK 38-12-23-920-802):
(a) If removed, install new filter elements to the related filter housings.
(b) Remove the bypass connectors from the related interfaces.
(c) If removed, install new canisters to the related interfaces.
(2) In each wet galley install all equipment connected to the potable water system which you removed for cleaning in the shop. Refer to the related installation tasks of these components.
(3) Do the leak check of the air supply system (Ref. AMM TASK 38-41-00-790-002).
Subtask 38-10-00-865-078-A (1) Install the galley water-filter elements (if removed) (Ref. AMM TASK 38-12-23-920-802):
(a) If removed, install new filter elements to the related filter housings.
(b) Remove the bypass connectors from the related interfaces.
(c) If removed, install new canisters to the related interfaces.
(2) In each wet galley install all equipment connected to the potable water system which you removed for cleaning in the shop. Refer to the related installation tasks of these components.
(3) Do the leak check of the air supply system (Ref. AMM TASK 38-41-00-790-002).
NOTE: Leaks are not permitted.
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 38-10-00-170-063-A | 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 | VACU TOIL SYS-VACUUM-GEN | 33MG | A08 |
| ** ON A/C NOT FOR ALL | |||
| 2001VU | WATER-SYS-DRAIN | 1MP | B05 |
| ** ON A/C NOT FOR ALL | |||
| 2001VU | VACU TOIL SYS-VACU-GEN | 33MG | A08 |
C. Flushing of Lavatory A
(1) In the lavatory A, flush the toilet a minimum of 5 times.
Subtask 38-10-00-613-064-A (1) In the lavatory A, flush the toilet a minimum of 5 times.
NOTE: The flushing is necessary to remove remaining waste water from the vacuum lines.
D. Filling of the Potable Water System
(1) If necessary, fill the potable water system (Ref. AMM TASK 12-15-38-613-001).
Subtask 38-10-00-410-070-A ** ON A/C NOT FOR ALL (1) If necessary, fill the potable water system (Ref. AMM TASK 12-15-38-613-001).
E. Close Access
(1) Disconnect the 98D38108002000 ADAPTER DRAIN MAST from the waste-water drain masts.
(2) On the forward drain-panel:
(a) Make sure that the work area is clean and clear of tools and other items.
(b) Close access door 133AL.
(3) On the mid drain-panel:
(a) Disconnect the HOSE - VINYL (3) from the POTABLE WATER OVERFLOW port (2).
(b) Make sure that the work area is clean and clear of tools and other items.
(c) Close access door 192NB.
(4) On the PWSP:
(a) Install the cap (8) on the fill/drain nipple (7).
(b) Make sure that the work area is clean and clear of tools and other items.
(c) Close access door 171AL.
(5) Make sure that the work area is clean and clear of tools and other items.
(6) Make sure that all manual shut-off valves of the potable water system are open.
(7) Set the switches on the water heaters in all lavatories to the ON position:
(a) If necessary, use a FLASHLIGHT and MIRROR - INSPECTION, FLEXIBLE to find the power switch of the water heater.
(8) Remove the WARNING NOTICE(S).
(9) Remove the access platform(s).
Subtask 38-10-00-410-070-B ** ON A/C NOT FOR ALL (1) Disconnect the 98D38108002000 ADAPTER DRAIN MAST from the waste-water drain masts.
(2) On the forward drain-panel:
(a) Make sure that the work area is clean and clear of tools and other items.
(b) Close access door 133AL.
(3) On the mid drain-panel:
(a) Disconnect the HOSE - VINYL (3) from the POTABLE WATER OVERFLOW port (2).
(b) Make sure that the work area is clean and clear of tools and other items.
(c) Close access door 192NB.
(4) On the PWSP:
(a) Install the cap (8) on the fill/drain nipple (7).
(b) Make sure that the work area is clean and clear of tools and other items.
(c) Close access door 171AL.
(5) Make sure that the work area is clean and clear of tools and other items.
(6) Make sure that all manual shut-off valves of the potable water system are open.
(7) Set the switches on the water heaters in all lavatories to the ON position:
(a) If necessary, use a FLASHLIGHT and MIRROR - INSPECTION, FLEXIBLE to find the power switch of the water heater.
(8) Remove the WARNING NOTICE(S).
(9) Remove the access platform(s).
E. Close Access
(1) Disconnect the 98D38108002000 ADAPTER DRAIN MAST from the waste-water drain masts.
(2) On the forward potable-water drain-panel:
(a) Make sure that the work area is clean and clear of tools and other items.
(b) Close access door 133AL.
(3) On the PWSP:
(a) Disconnect the HOSE - VINYL (6) from the POTABLE WATER OVERFLOW port (7).
(b) Install the cap (5) on the fill/drain nipple (4).
(c) Make sure that the work area is clean and clear of tools and other items.
(d) Close access door 171AL.
(4) Make sure that the work area is clean and clear of tools and other items.
(5) Make sure that all manual shut-off valves of the potable water system are open.
(6) Set the switches on the water heaters in all lavatories to the ON position:
(a) If necessary, use a FLASHLIGHT and MIRROR - INSPECTION, FLEXIBLE to find the power switch of the water heater.
(7) Remove the WARNING NOTICE(S).
(8) Remove the access platform(s).
Subtask 38-10-00-942-062-A (1) Disconnect the 98D38108002000 ADAPTER DRAIN MAST from the waste-water drain masts.
(2) On the forward potable-water drain-panel:
(a) Make sure that the work area is clean and clear of tools and other items.
(b) Close access door 133AL.
(3) On the PWSP:
(a) Disconnect the HOSE - VINYL (6) from the POTABLE WATER OVERFLOW port (7).
(b) Install the cap (5) on the fill/drain nipple (4).
(c) Make sure that the work area is clean and clear of tools and other items.
(d) Close access door 171AL.
(4) Make sure that the work area is clean and clear of tools and other items.
(5) Make sure that all manual shut-off valves of the potable water system are open.
(6) Set the switches on the water heaters in all lavatories to the ON position:
(a) If necessary, use a FLASHLIGHT and MIRROR - INSPECTION, FLEXIBLE to find the power switch of the water heater.
(7) Remove the WARNING NOTICE(S).
(8) Remove the access platform(s).
F. Removal of the Ground Support Equipment
(1) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(2) For the disposal of the used decalcification solution, refer to the national or local authority regulations.
Subtask 38-10-00-862-056-A (1) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(2) For the disposal of the used decalcification solution, refer to the national or local authority regulations.