NOTE: If a large quantity of liquid is to be removed, a suction pump should be used to drain the contaminated area.
(3)
Use approved cleaning agents and disinfectants when you clean areas where blue water contamination has occurred (AMM 20-30-31/201).
(4)
When blue water is found in the lavatory area, do the steps that follow:
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(a) Remove laying blue water from all surfaces.
NOTE: Most of the blue water should drain out of the airplane through the floor drains and the waste water system.
WARNING: DO NOT USE TOO MUCH FRESH WATER TO REMOVE THE BLUE STAIN BECAUSE ADDITIONAL WATER COULD CAUSE POSSIBLE DAMAGE TO ELECTRICAL EQUIPMENT. THIS CAN RESULT IN AN UNWANTED EFFECT ON THE FLIGHT SAFETY OF THE AIRPLANE.
(b)
Use clean fresh water to dilute contaminated areas of the blue stain.
(c)
If there are signs of blue water on the toilet tank, make sure you remove all blue water stains from the toilet tank and all related components and connections.
NOTE: It is important that all blue stains are removed from the area. This will allow accurate visual inspections to be done in the future.
(d)
If blue water was found on the toilet floor, make sure all signs of blue water stains are removed from the toilet floor, and all floor installed connections.
(e)
If blue water was found on the modular toilet, make sure all signs of blue water stains are removed and the weep holes in the floor pan are free from blockage.
(f)
Use a clean, moisture-free cloth or sponge to fully dry all surfaces and components.
(g)
Use a dry air supply to fully remove additional moisture from the contaminated areas which are difficult to touch.
(h)
If there are surface areas which remain with a blue stain, make a record of the precise location.
NOTE: A record of a blue stain area can help to find the cause of a possible new leak of blue water, should a leak occur in the future.
(5) If blue water is found in the electronic equipment compartment, do the steps that follow:
WARNING: DO NOT USE TOO MUCH FRESH WATER TO REMOVE THE BLUE STAIN BECAUSE ADDITIONAL WATER COULD CAUSE POSSIBLE DAMAGE TO ELECTRICAL EQUIPMENT. THIS CAN RESULT IN AN UNWANTED EFFECT ON THE FLIGHT SAFETY OF THE AIRPLANE.
(a)
Protect adjacent areas to the contaminated area, from the cleaning procedure, by the use of polyethylene sheeting as a waterproof cover.
(b)
Use clean fresh water to dilute contaminated areas of the blue stain.
(c)
Use a clean absorbent cloth or a sponge to remove laying blue water from all areas shown during the toilet over-servicing inspection of the electronic equipment compartment.
(d)
If the airstair drip pan is contaminated by blue water, do the steps that follow: 1) Make sure the airstair drip pan is drained of liquid. 2) Remove the access panel on the airstair drip pan (AMM 25-51-0/001). 3) Fully clean the airstair drip pan and access panel with fresh water. 4) Make sure the drain in the access panel is free from blockage.
(e)
If the moisture shroud is contaminated by blue water, remove the moisture shroud from the airplane (AMM 25-51-0/001) and clean with fresh water.
NOTE: It is not recommended to clean the shroud in the installed configuration; damage can occur to the shroud.
(f)
Make sure all moisture-shroud drain channels are clean and free from blockage.
(g)
Use a clean cloth to fully dry all surfaces and use a dry air supply to dry the areas which are difficult to touch.
(h)
If the area below the toilet tank shows signs of blue water contamination, fully clean the drain tube, the ground flush hose or the drain valve control cable with fresh water.
NOTE: You must be most careful with the use of water in the electronic equipment compartment; additional contamination must not occur.
(i)
If the blue water contamination shows on the electronic racks and equipment, do the steps that follow: 1) Remove blue water from all surfaces, cables and connectors. 2) Use a dry air supply to remove all moisture from the contaminated areas.
NOTE: It is important that all blue stains are removed from the area. This will allow accurate visual inspections to be done in the future.
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NOTE: Electrical cable looms can hold moisture between the separate wires. If possible, open the wires in a contaminated cable when you dry the cable.
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