(2)
For supply/drain valve, if necessary, proceed as follows:
(a)
Open towel disposal container access door.
(b)
Remove container and open access door inside container enclosure.
D. Open tank drain valve. In each lavatory, position three-way supply/drain valve handle to DRAIN.
E. On airplanes with forward lavatory, with secondary drain valve installed, position the drain valve to OPEN.
F. On ALL EXCEPT airplanes with press-to-flow faucets,
(1)
In forward lavatory, position vent valve handle to DRAIN.
(2)
In aft lavatory, position vent valve handle parallel to airplane centerline.
G. When water stops flowing from drain outlets close tank drain valve. Position three-way lavatory supply/drain valve handles to ON.
H. Allow 2 minutes for pressure to stabilize.
I. In each lavatory, position three-way supply/drain valve handle to DRAIN to exhaust residual water, then to ON.
J. On ALL EXCEPT airplanes with press-to-flow faucets, repeat step H for every lavatory and open each water faucet for 1/2 minute, then close.
K. Repeat step H, open each galley water outlet, and drain water into gallon container. Close galley water outlet.
L. Where applicable disconnect coffeemaker and repeat step K.
M. Restore airplane to normal.
(1)
Depressurize water tank (AMM 38-41-0/201).
(2)
On airplanes with forward lavatory, with secondary drain valve installed, position the drain valve to CLOSED.
(3)
In each forward lavatory, if applicable, position vent valve handle to ON.
(4)
In each aft lavatory, if applicable, position vent valve handle pointing into sink cabinet.
(5)
Where applicable connect coffeemaker to water supply in galley.
3. Gravity Draining Passenger Water System
A. Open all lavatory water heater circuit breakers on P18.
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May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 38-11-0 Page 301
B. Open fill and overflow valve and tank drain valve. In each lavatory, position 3-way supply/drain valve handle to DRAIN. In each forward lavatory, if applicable, position vent valve handle to DRAIN. In each aft lavatory, if applicable, position vent valve handle parallel to airplane centerline.
C. On airplanes with forward lavatory, with secondary drain valve installed, position the drain valve to OPEN.
D. When water stops flowing from drain outlets close fill and overflow valve and tank drain valve. Position 3-way supply/drain valve handles to ON. In each forward lavatory, if applicable, position vent valve handle to ON. In each aft lavatory, if applicable, position vent valve handle pointing into sink cabinet.
E. Open each galley water outlet and drain water into gallon container. Close outlet.
F. Where applicable disconnect coffeemaker and repeat step E.
G. On airplanes with forward lavatory, with secondary drain valve installed, position the drain valve to CLOSED.
H. Install towel disposal container as necessary and close doors.
4. Disinfect Passenger Water System
A. General
(1) The passenger water system may be disinfected with an application of the following:
(a)
50 parts per million of chlorine acidified with vinegar
(b)
100 parts per million of chlorine - not acidified
(c)
50 parts per million of chlorine - not acidified
NOTE: Disinfecting time for (a) and (b) is 1 hour. Disinfecting time for (c) is 4 hours.
(2) Recommended chlorine solution (concentrated). The following concentrated solution will result in a 50 parts per million of acidified chlorine solution when added to a 30-gallon water tank. This solution minimizes the objectionable taste normally attributed to disinfectants and requires the shorter disinfecting time.
(a)
9 fluid ounces (266 ml) chlorine dioxide stabilized 2%
(b)
9 fluid ounces (266 ml) acetic acid (vinegar)
(c)
Approximately 1 gallon (4 liters) clean water
NOTE: Let mixture stand 5 minutes to complete activation.
B. Remove all filter cartridges from water system, where applicable, including coffeemakers. Reinstall filter caps.
NOTE: An excessive amount of disinfectant in the passenger water system may contaminate filter and give an objectionable taste of chlorinated water. Use of the recommended chlorine solution (Ref par. A.(2)) will minimize the objectionable taste.
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