11.17

Question 1

Whats the 3 subsystems which use water and waste systems ?

Answer 1

Potable water system
Toilet system
Water waste system

Question 2

What does the portable water systems provide to the galleys, lavatory’s ?

Answer 2

Drinkable water

Question 3

Where is portable water stored ?

Answer 3

Under cabin floor, generally in cargo sidewalls

Question 4

What does portable water use to transport the water from storage tanks to the galleys ?

Answer 4

Pressurisation

Question 5

What pressurises portable water system ?

Answer 5

Electric pump

Question 6

What prevents a reverse flow of water and air to the air supply when is pressure is lower than the tank pressure ?

Answer 6

Check valves

Question 7

Where is the pressure relief valve in the portable water system ?

Answer 7

Between tank and pressure switch

Question 8

If pneumatic system fails, what then drives the water and pressurises it ?

Answer 8

air compressor

Question 9

What are shut-off valves used to do ?

Answer 9

Isolate sections of water system for maintenance

Question 10

How does the pneumatic system change to air compressor in case of a failure to deliver portable water ?

Answer 10

Pressure switch which happens automatically

Question 11

When should you completely drain the water system ?

Answer 11

Before disinfecting

When parking aircraft in cold weather

Every three days - adding fresh water preventing bacteria

Question 12

Where is the water service panel or drain pane located ?

Answer 12

Lower part of fuselage and somewhere that doesn’t effect other areas needed during a after flight turnaround

Question 13

Explain what happens when you overfill the water tank when re filling it ?

Answer 13

Overfill drain line takes the water and spills it overboard

Question 14

How do you drain the water system ?

Answer 14

-Open shut-off valves and drain valves
-pull drain handle

Question 15

Whats the components of a lavatory water system ?

Answer 15

Header
Manual shut-off valve
Heater
Mixer valve
Washbasin

Question 16

What dos the header do in a lavatory system ?

Answer 16

Distributes water to its needs

Question 17

What does the mixer valve do in a lavatory water system ?

Answer 17

Mixes warm and cold water

Question 18

What does the drain mast remove ?

Answer 18

Wastewater

Question 19

Whats the 2 ways that the flow of waste water is generated by ?

Answer 19

Gravity

Differential pressure between pressurised cabin and exhaust at the end of drain mast

Question 20

Whats the type of wastewater called “grey water” ?

Answer 20

Collected in tank and emptied from the ground service panel when aircraft has landed

Question 21

Whats the two types of toilet waste systems ?

Answer 21

Flush
Vacuum

Question 22

Explain the operation of the flush toilet system ?

Answer 22

When flush handle is pressed it activates timer that controls flush motor which tuns a pump that sprays a flashing agent from the tank though a filter and into bowl

Question 23

Explain the operation of a vacuum toilet system ?

Answer 23

Suctions waste from toilets and moves it to a waste holding tank

Question 24

Where are the waste tanks located ?

Answer 24

Cargo compartment ( centre of aircraft )

Question 25

What happens when the waste tank is full ?

Answer 25

Module shuts the system down and provides indications to flight deck and the cabin control panel

Question 26

How is the waste tank cleaned ?

Answer 26

Attaching water pressure hose to the ground flush connection.