Aircraft Water and Waste System Overview

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What subsystems make up the water and waste system?

Drinking water system, sewage system, drainage system

Water supply system, HVAC system, electrical system

Water purification system, recycling system, irrigation system

Potable water system, waste water system, toilet system (correct)

How is the potable water tank pressurized to supply water?

Compressed air from the bleed air system or ground pressure connection (correct)

Wind energy conversion

Hydraulic pump system

Solar power backup

What controls the heating of water pipes in icing conditions?

Manual water pipe insulation adjustment

Heating elements based on ambient temperature

Water flow rate regulation valves

Tape electrical heaters controlled by anti ice control units (correct)

How is each lavatory connected to the potable water distribution system?

Through a manual shut-off valve for isolation Signup and view all the answers

What is used to prevent ice formation in the potable water servicing panel?

Heating elements installed in the panel Signup and view all the answers

How are water faucets in the aircraft supplied with water?

Through a distribution system from the water tank Signup and view all the answers

What is the maximum amount of water used to flush the waste tank?

57 liters Signup and view all the answers

In cold weather conditions, why must the potable water system be drained?

To prevent damage to the system by ice Signup and view all the answers

What must be done if the drain mast is not heated?

Not dispatch the aircraft Signup and view all the answers

What is the purpose of moving the drain valve control-handle to the open position?

Drain waste from the toilet tank Signup and view all the answers

What should be done after flushing the waste tank with water?

Drain the water from the tank Signup and view all the answers

Under what condition can an aircraft be dispatched if the drain mast is not heated?

When galley and toilet use is restricted Signup and view all the answers

What is used to prevent ice formation in the fill/drain nipple and overflow nipple?

Electric heating Signup and view all the answers

What controls the potable water service panel heating?

Thermostat Signup and view all the answers

What must be done in winter conditions regarding the potable water system during night stops?

It must be drained Signup and view all the answers

Where are the water and waste indications displayed?

Flight Attendant Panel (FAP) Signup and view all the answers

How is the filling quantity selected for the water tank?

25%, 50%, 75%, and 100% Signup and view all the answers

What happens when the fill/drain control handle is set to the drain position?

Forward drain valve opens Signup and view all the answers

Where is the waste holding tank installed on the aircraft?

Right of the aircraft under the floor behind the bulk cargo compartment Signup and view all the answers

What controls the flushing system operation in the toilet system?

Vacuum System Controller Function (VSCF) Signup and view all the answers

What is the purpose of the fill/drain control handle?

To select a filling or draining operation for the water Signup and view all the answers

Where is the potable water service panel located?

In the rear left hand side of the fuselage Signup and view all the answers

What happens when the potable water service panel door is opened?

The water and waste page appears automatically on the FAP Signup and view all the answers

Where is the FAP located?

In the forward section of the cabin Signup and view all the answers

What information does the FAP display about the potable water system?

The water quantity stored in the potable water tank Signup and view all the answers

Where is the toilet service panel located?

In the rear right hand side of the fuselage between FR65 and FR66 Signup and view all the answers

What happens when the toilet service panel door is opened on the ground?

The Cabin Intercommunication Data System (CIDS) stops all toilet operations Signup and view all the answers

What does the FAP display about the waste holding tank?

The waste quantity stored in the waste holding tank Signup and view all the answers

What happens when a lavatory is deactivated?

All of the above Signup and view all the answers

What is the primary purpose of the compressed air used in the potable water system?

To pressurize the system and supply water from the tank to the necessary service locations Signup and view all the answers

Where is the potable water tank located?

In the pressurized LH underfloor area rear of the aft cargo compartment Signup and view all the answers

What is the purpose of the water heaters installed in the lavatories and galleys?

To provide hot water to the water faucets in the lavatories and galleys Signup and view all the answers

What is the purpose of the anti-ice control units installed in the cargo compartments?

To automatically control the heating elements that prevent ice formation in the water pipes Signup and view all the answers

How are mechanically or electrically operated valves used in the potable water system?

To control the supply of water from the water tank to the water faucets in the galleys and lavatories Signup and view all the answers

What is the purpose of the potable water service panel heating?

To prevent ice formation in the potable water servicing panel in icing conditions Signup and view all the answers

What is the purpose of the manual shut-off valves installed in each lavatory?

To isolate each lavatory from the potable water distribution system Signup and view all the answers

What is the purpose of the electrically heated fill/drain nipple and overflow nipple?

To prevent ice formation in the remaining water Signup and view all the answers

Where is the potable water service panel located?

In the rear lower fuselage on the LH side Signup and view all the answers

What controls the flushing system operation in the toilet system?

The Vacuum System Controller Function (VSCF) Signup and view all the answers

Where is the waste holding tank installed on the aircraft?

On the right of the aircraft under the floor behind the bulk cargo compartment Signup and view all the answers

How is the potable water tank pressurized to supply water?

Using the aircraft's pressurized water system Signup and view all the answers

What happens when the potable water service panel door is opened?

All of the above Signup and view all the answers

What must be done in winter conditions regarding the potable water system during night stops?

The potable water system must be drained Signup and view all the answers

What happens when the forward drain valve open light comes on?

The light has a lamp press to test facility Signup and view all the answers

Where is the forward water drain panel located on the aircraft?

On the A/C center line of the lower fuselage Signup and view all the answers

What is the purpose of the door microswitch related to the potable water service panel?

Isolates the indicating system when the door is open Signup and view all the answers

When does the water and waste page come on automatically on the Flight Attendant Panel (FAP)?

When the service panel door is opened Signup and view all the answers

Where is the toilet service panel installed on the aircraft?

In the rear right side of the fuselage Signup and view all the answers

What message comes on when the toilet service panel is open on ground?

"Vacuum System Disabled - Ground Servicing" Signup and view all the answers

What does a grey square symbolize on the aircraft symbol concerning lavatories?

Activated lavatory Signup and view all the answers

What is the maximum pressure allowed when flushing the waste tank?

3.45 bar (50.0380 psi) Signup and view all the answers

How much disinfectant solution should be filled in the toilet tank after draining?

10 liters Signup and view all the answers

What should be done if waste fluids such as oil, fuel, solvent or lubricant are spilled?

Sort them and use special waste disposal containers Signup and view all the answers

What is the approximate time required for flushing the waste tank with water?

90 seconds Signup and view all the answers

If the drain mast is not heated, what action should be taken?

The associated galleys or toilets must be locked and placarded as inoperative Signup and view all the answers

What should be done with the drain valves if the bleed air system is off and the external air temperature is below 0°C (32°F)?

The drain valves must be left open Signup and view all the answers

What is the maximum amount of water that should be used to flush the waste tank?

57 liters (15.0576 USgal) Signup and view all the answers

What should be done after draining the water from the tank?

Fill the tank with disinfectant solution Signup and view all the answers

What controls the heating of water pipes in icing conditions?

The information is not provided in the text Signup and view all the answers

What is the primary purpose of the compressed air used in the potable water system?

To pressurize the potable water tank and supply water to the necessary service locations Signup and view all the answers

Where is the potable water tank installed on the aircraft?

In the pressurized LH underfloor area rear of the aft cargo compartment Signup and view all the answers

What is the purpose of the water heaters installed in the lavatories and galleys?

To heat the water for the faucets and sinks Signup and view all the answers

What is the purpose of the anti-ice control units installed in the cargo compartments?

To control the heating of the water pipes in icing conditions Signup and view all the answers

How is each lavatory connected to the potable water distribution system?

Through a manual shut-off valve that can isolate the lavatory from the system Signup and view all the answers

What is the purpose of the potable water service panel heating?

To prevent ice formation in the potable water servicing panel in icing conditions Signup and view all the answers

What subsystems make up the water and waste system?

Potable water system, waste water system, and toilet system Signup and view all the answers

What is the main purpose of flushing the waste tank with water?

To clean and disinfect the tank Signup and view all the answers

What should be done with the drain valves if the bleed air system is off and the external air temperature is below 0°C (32°F)?

Open the drain valves to allow the system to drain Signup and view all the answers

What is the maximum pressure allowed when flushing the waste tank?

3.45 bar (50.04 psi) Signup and view all the answers

How much disinfectant solution should be added to the toilet tank after draining?

10 liters Signup and view all the answers

What is the approximate time required for flushing the waste tank with water?

90 seconds Signup and view all the answers

What must be done if the drain mast is not heated?

The aircraft can be dispatched if the associated galleys and toilets are not used Signup and view all the answers

What is the purpose of moving the drain valve control-handle to the open position?

To drain the waste from the toilet tank Signup and view all the answers

What is the maximum amount of water that should be used to flush the waste tank?

57 liters (15.0576 gallons) Signup and view all the answers

What is the primary purpose of the compressed air used in the potable water system?

To pressurize the potable water tank Signup and view all the answers

What does the tank full light indicate?

The water tank is full Signup and view all the answers

Where is the forward water drain panel located?

On the A/C center line of the lower fuselage Signup and view all the answers

What is indicated by the tank symbol with a scale on the Flight Attendant Panel (FAP)?

Liquid level in percentage Signup and view all the answers

What happens when the toilet service panel door is open on ground?

CIDS stops all toilet operations Signup and view all the answers

What information does the FAP display about the waste holding tank?

Waste quantity in percentage Signup and view all the answers

When does the FAP WATER/WASTE page appear automatically?

When there is a fault in the system Signup and view all the answers

What does the amber cross symbolize on the lavatory square of the aircraft symbol?

De-activated lavatory due to no communication with flush control unit Signup and view all the answers

What is the purpose of the electrical heating elements in the drain masts?

To prevent ice formation during flight and in cold weather Signup and view all the answers

How does the toilet system operate at high altitudes?

It relies on the differential pressure between the cabin and atmosphere to move waste Signup and view all the answers

What component controls the flushing system operation in the toilet system?

The Vacuum System Controller Function (VSCF) Signup and view all the answers

Where is the Vacuum System Controller Function (VSCF) installed?

In the avionics compartment Signup and view all the answers

What happens when the waste servicing panel is open?

The toilet system operation stops Signup and view all the answers

What component is used to separate water from the waste in the holding tank?

A water separator Signup and view all the answers

How is the filling quantity for the potable water tank selected?

By selecting the desired percentage (25%, 50%, 75%, or 100%) on the FAP Signup and view all the answers

How is the potable water tank pressurized to supply water?

By using compressed air from the bleed air system or ground pressure connection Signup and view all the answers

What prevents ice formation in the potable water servicing panel in icing conditions?

Heated tape electrical heaters Signup and view all the answers

What component controls the supply of the potable water system?

Electrically operated valves Signup and view all the answers

What is the purpose of the manual shut-off valves installed in each lavatory?

To isolate each lavatory from the potable water distribution system Signup and view all the answers

Why are water pipes, where icing conditions can occur, insulated and heated?

To prevent ice formation on the pipes Signup and view all the answers

What controls the automatic heating of the water pipes in icing conditions?

Two anti ice control units installed in the cargo compartments Signup and view all the answers

Where is one of the water heaters installed within the aircraft?

In each lavatory and galley Signup and view all the answers

How is compressed air supplied to pressurize the potable water system?

From the bleed air system in normal configuration or a ground pressure connection Signup and view all the answers

What prevents ice formation in the potable water service panel?

Heated tape electrical heaters Signup and view all the answers

How does the potable water get supplied to water faucets in galleys and lavatories?

From a distribution system connected to the water tank Signup and view all the answers

What controls the operation of the potable water system's heating in icing conditions?

Thermostat Signup and view all the answers

Where is the waste holding tank installed on the aircraft?

On the right under the floor behind the bulk cargo compartment Signup and view all the answers

What triggers the stopping of the flushing system operation in the toilet system?

Liquid level sensor Signup and view all the answers

Which component prevents ice formation in the drain masts during cold weather?

Integrated heating elements Signup and view all the answers

How is waste moved from the toilet bowl to the waste holding tank at high altitude?

Differential pressure between cabin and atmosphere Signup and view all the answers

Where is the door microswitch located in relation to the potable water service panel?

On the door itself Signup and view all the answers

What is used to supply potable water for flushing in the toilet system?

Potable water tank Signup and view all the answers

Which system controls and stops toilet system operation when needed?

Vacuum System Controller Function (VSCF) Signup and view all the answers

What is used to discard used water from lavatories and galley sinks?

Waste water system with drain valve and drain mast Signup and view all the answers

How does waste move from a toilet bowl to a waste holding tank at low altitude or on ground?

Vacuum generator activates differential pressure Signup and view all the answers

What is the purpose of the fill/drain control handle?

To select a filling or draining operation for the potable water tank Signup and view all the answers

Where is the forward water drain panel located?

On the A/C center line of the lower fuselage Signup and view all the answers

What is the purpose of the door microswitch on the potable water service panel?

It isolates the indicating system when the panel is closed Signup and view all the answers

What is the purpose of the tank full light?

It indicates when the water tank is full Signup and view all the answers

What is the purpose of the water and waste page on the Flight Attendant Panel (FAP)?

All of the above Signup and view all the answers

What is the purpose of the drain control handle at the toilet service panel?

To manually operate the waste holding tank drain valve Signup and view all the answers

What is indicated by the grey square on the aircraft symbol for a lavatory?

The lavatory is activated Signup and view all the answers

What is indicated by the amber square on the aircraft symbol for a lavatory?

The lavatory is deactivated Signup and view all the answers

What is the purpose of the RESET WARNING button on the FAP?

To reset the water and waste system in case of flush valve failure Signup and view all the answers

What message comes on when the toilet service panel is open on the ground?

VACUUM SYSTEM DISABLED-GROUND SERVICING Signup and view all the answers

What is the maximum pressure allowed when flushing the waste tank?

$3.45 bar (50.0380 psi)$ Signup and view all the answers

What should be done with the drain valves if the bleed air system is off and the external air temperature is below 0C (32F)?

The drain valves must remain open after the potable water system is drained to prevent damage to the potable water system. Signup and view all the answers

What is the main purpose of flushing the waste tank with water?

To clean the waste tank Signup and view all the answers

What should be done after draining the water from the tank?

Fill the toilet tank with 10 l of disinfectant solution. Signup and view all the answers

What is the approximate time required for flushing the waste tank with water?

90 seconds Signup and view all the answers

What should be done if waste fluids such as oil, fuel, solvent or lubricant are spilled?

Sort them and use special waste disposal containers. Signup and view all the answers

What is the maximum amount of water that should be used to flush the waste tank?

57 l (15.0576 USgal) Signup and view all the answers

What happens when a lavatory is deactivated?

The lavatory door is locked, and a placard is placed indicating it is inoperative. Signup and view all the answers

What is the purpose of the electrical heating elements in the drain masts?

To heat the drain masts and prevent ice formation. Signup and view all the answers

What is the primary purpose of the compressed air used in the potable water system?

To pressurize the potable water tank. Signup and view all the answers

What is the purpose of the potable water service panel heating?

To prevent ice formation in the fill/drain nipple and overflow nipple. Signup and view all the answers

Aircraft Water and Waste System Overview

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Questions and Answers

What subsystems make up the water and waste system?

How is the potable water tank pressurized to supply water?

What controls the heating of water pipes in icing conditions?

How is each lavatory connected to the potable water distribution system?

What is used to prevent ice formation in the potable water servicing panel?

How are water faucets in the aircraft supplied with water?

What is the maximum amount of water used to flush the waste tank?

In cold weather conditions, why must the potable water system be drained?

What must be done if the drain mast is not heated?

What is the purpose of moving the drain valve control-handle to the open position?

What should be done after flushing the waste tank with water?

Under what condition can an aircraft be dispatched if the drain mast is not heated?

What is used to prevent ice formation in the fill/drain nipple and overflow nipple?

What controls the potable water service panel heating?

What must be done in winter conditions regarding the potable water system during night stops?

Where are the water and waste indications displayed?

How is the filling quantity selected for the water tank?

What happens when the fill/drain control handle is set to the drain position?

Where is the waste holding tank installed on the aircraft?

What controls the flushing system operation in the toilet system?

What is the purpose of the fill/drain control handle?

Where is the potable water service panel located?

What happens when the potable water service panel door is opened?

Where is the FAP located?

What information does the FAP display about the potable water system?

Where is the toilet service panel located?

What happens when the toilet service panel door is opened on the ground?

What does the FAP display about the waste holding tank?

What happens when a lavatory is deactivated?

What is the primary purpose of the compressed air used in the potable water system?

Where is the potable water tank located?

What is the purpose of the water heaters installed in the lavatories and galleys?

What is the purpose of the anti-ice control units installed in the cargo compartments?

How are mechanically or electrically operated valves used in the potable water system?

What is the purpose of the potable water service panel heating?

What is the purpose of the manual shut-off valves installed in each lavatory?

What is the purpose of the electrically heated fill/drain nipple and overflow nipple?

Where is the potable water service panel located?

What controls the flushing system operation in the toilet system?

Where is the waste holding tank installed on the aircraft?

How is the potable water tank pressurized to supply water?

What happens when the potable water service panel door is opened?

What must be done in winter conditions regarding the potable water system during night stops?

What happens when the forward drain valve open light comes on?

Where is the forward water drain panel located on the aircraft?

What is the purpose of the door microswitch related to the potable water service panel?

When does the water and waste page come on automatically on the Flight Attendant Panel (FAP)?

Where is the toilet service panel installed on the aircraft?

What message comes on when the toilet service panel is open on ground?

What does a grey square symbolize on the aircraft symbol concerning lavatories?

What is the maximum pressure allowed when flushing the waste tank?

How much disinfectant solution should be filled in the toilet tank after draining?

What should be done if waste fluids such as oil, fuel, solvent or lubricant are spilled?

What is the approximate time required for flushing the waste tank with water?

If the drain mast is not heated, what action should be taken?

What should be done with the drain valves if the bleed air system is off and the external air temperature is below 0°C (32°F)?

What is the maximum amount of water that should be used to flush the waste tank?

What should be done after draining the water from the tank?

What controls the heating of water pipes in icing conditions?

What is the primary purpose of the compressed air used in the potable water system?

Where is the potable water tank installed on the aircraft?

What is the purpose of the water heaters installed in the lavatories and galleys?

What is the purpose of the anti-ice control units installed in the cargo compartments?

How is each lavatory connected to the potable water distribution system?

What is the purpose of the potable water service panel heating?

What subsystems make up the water and waste system?

What is the main purpose of flushing the waste tank with water?

What should be done with the drain valves if the bleed air system is off and the external air temperature is below 0°C (32°F)?

What is the maximum pressure allowed when flushing the waste tank?

How much disinfectant solution should be added to the toilet tank after draining?

What is the approximate time required for flushing the waste tank with water?

What must be done if the drain mast is not heated?

What is the purpose of moving the drain valve control-handle to the open position?

What is the maximum amount of water that should be used to flush the waste tank?

What is the primary purpose of the compressed air used in the potable water system?

What does the tank full light indicate?

Where is the forward water drain panel located?