WATER AND WASTE SYSTEMS
Table of Contents
Vol. 1
21--00--1
REV 56, Jan 31/03
CHAPTER 21 --- WATER AND WASTE SYSTEMS
Page
TABLE OF CONTENTS
Table of Contents
21--00
21--00--1
INTRODUCTION
Introduction
21--10
21--10--1
POTABLE WATER SYSTEM
Potable Water System
Servicing
System Circuit Breakers
21--20
21--20--1
21--20--2
21--20--6
LAVATORY WASTE SYSTEM
Lavatory Waste System
System Circuit Breakers
21--30
21--30--1
21--30--3
LIST OF ILLUSTRATIONS
INTRODUCTION
Figure 21--10--1
Potable Water and Waste
Systems -- General Arrangement
21--10--2
POTABLE WATER SYSTEM
Figure 21--20--1
Galley Potable Water System
Figure 21--20--2
Lavatory Water System
Figure 21--20--3
Galley Control Panel
21--20--3
21--20--4
21--20--5
LAVATORY WASTE SYSTEM
Figure 21--30--1
Waste Disposal System
21--30--2
Flight Crew Operating Manual
CSP A--013
MASTER
WATER AND WASTE SYSTEMS
Table of Contents
Vol. 1
21--00--2
REV 56, Jan 31/03
THIS PAGE INTENTIONALLY LEFT BLANK
Flight Crew Operating Manual
CSP A--013
MASTER
WATER AND WASTE SYSTEMS
Introduction
1.
Vol. 1
21--10--1
REV 56, Jan 31/03
INTRODUCTION
The water and waste systems include potable water, lavatory waste equipment and system
controls.
Two potable water systems store and supply potable water to the galley and lavatory. The
forward water system supplies potable water to the water dispenser and coffee maker in the
galley. The aft water system supplies wash water to the lavatory sink. Both water systems
are controlled from a single control panel located in the galley. Each water system has a
servicing panel located on the right forward and aft external fuselage. Each servicing panel
has controls for filling or draining of the related potable water system.
The lavatory waste system consists of a waste holding tank containing flushing fluid and a
servicing panel. The servicing panel is located on the right aft external fuselage. System
controls are provided to drain, rinse, prime and flush the toilet.
Flight Crew Operating Manual
CSP A--013
MASTER
WATER AND WASTE SYSTEMS
Introduction
AFT
WATER
TANK
DRAIN
LINE
21--10--2
Vol. 1
REV 56, Jan 31/03
AFT WATER
TANK (CARGO BAY)
WASHBASIN
SUPPLY LINE
WASHBASIN
FAUCET
WASHBASIN
DRAIN LINE
SERVICE
DOOR (REF)
AFT
DRAIN
MAST
AFT
WATER
TANK
SERVICE
PANEL
GALLEY WATER
SUPPLY LINE
GALLEY
DRAIN
LINE
TOILET
DRAIN/SERVICE
PANEL
FORWARD
WATER TANK
SERVICE PANEL
FORWARD
DRAIN MAST
FORWARD
WATER TANK
(UNDER FLOOR)
Potable Water and Waste Systems ---General Arrangement
Figure 21---10---1
Flight Crew Operating Manual
CSP A--013
MASTER
WATER AND WASTE SYSTEMS
Potable Water System
1.
Vol. 1
21--20--1
REV 56, Jan 31/03
POTABLE WATER SYSTEM
The potable water system stores, supplies and controls the flow of water to the galley and
lavatory. Potable water for the coffee maker, water dispenser and galley wash basin is
stored in the forward water tank. Potable water for the lavatory wash basin is stored in the
aft water tank. Each tank has a water level/temperature probe and a heater. System power
on/off switches, water tank level lights and system circuit breakers are located on the galley
control panel in the galley. The forward and aft water systems are independent, but are
controlled by a single potable water system electronic control unit (ECU) located in the
avionics compartment. The ECU controls the tank heaters, pumps and provides water level
indications to the control panel.
Potable water is supplied to the galley from a single 5 USG (19 LTR) water tank located
under the galley floor. Potable water is supplied to the galley by an ECU controlled pump,
which maintains the water supply line pressure to the galley. The ECU controls the galley
tank heater to maintain the water temperature between 10 to 20_C (50 -- 68_F). Each tank
heater contains a thermal fuse for overheat protection, which removes power to the heater
when it exceeds a preset point and turns on the OVHT light on the galley control panel.
Potable water is supplied to the galley from a single 8 USG (30 LTR) water tank located
under the galley floor. Potable water is supplied to the galley by an ECU controlled pump,
which maintains the water supply line pressure to the galley. The ECU controls the galley
tank heater to maintain the water temperature between 10 to 20_C (50 -- 68_F). Each tank
heater contains a thermal fuse for overheat protection which removes power to the heater
when it exceeds a preset point and turns on the OVHT light on the galley control panel.
<0080>
Potable water is supplied to the lavatory sink from a single 5 USG (19 LTR) water tank
located in the baggage compartment. Potable water is supplied to the lavatory by a pump
which is controlled by the sink faucet selection. Wash basin water is heated to 25 ±5_C
(77 9_F).
A water level/temperature probe is installed in each tank and supplies level and temperature
information to the ECU. The ECU then uses the information to control the tank heaters and
to illuminate the respective empty, 1/4, 1/2, 3/4 or full level indicator on the galley control
panel.
Electrical power for the ECU, tank heaters and line heaters is controlled by the respective
galley and lavatory ON/OFF switches on the galley control panel.
Effectivity:
S Airplanes Pre SB 601R-- 38-- 19 thru 22
Each system provides drainage of used water overboard through drain masts on the bottom of
the fuselage. All components that could possibly freeze are heated and/or insulated to
maintain the component temperature above the freezing point.
Flight Crew Operating Manual
CSP A--013
MASTER
WATER AND WASTE SYSTEMS
Potable Water System
Vol. 1
21--20--2
REV 56, Jan 31/03
CAUTION
In flight, if the galley or lavatory ON/OFF switch is
inadvertently selected OFF, power will be removed
from the corresponding mast heater. Continued use
of the respective drain system may cause ice
accumulation on the drain mast which may detach and
cause damage to the aircraft. <Pre SB 601R--38--19 thru 22>
Effectivity:
S Airplanes Post SB 601R-- 38-- 19 thru 22
Each system provides drainage of used water overboard through drain masts on the bottom of
the fuselage. All components that are likely to freeze are heated and/or insulated to maintain
the component temperature abovethe freezing point. The drain mast heaters are continuously
powered from AC utility bus 2. This is done to prevent ice build--up on the drain masts, in
flight, if the galley or lavatory ON/OFF switch is inadvertently selected OFF. Power can be
removed from the drain masts by opening the LINE HTR circuit breakers on the potable water
system control panel or by removing power from AC utility bus 2.
2.
SERVICING
Each potable water system has a service panel located on the right side of the external
fuselage. The galley service panel is forward and the lavatory service panel aft. Each
service panel has a water fill port and a control handle.
When the control handle is positioned to the FILL position, water can be pumped into the
system using the fill adapter. When the tank is full, water flows out through the overboard
drain mast. When the control handle is placed in the DRAIN position and pulled, the potable
water is drained from the tank through the drain mast.
Effectivity:
S Airplanes Post SB 601R-- 38-- 19 thru 22
When the control handle is positioned to the FILL position, water can be pumped into the
system using the fill adapter. When the tank is full, water flows out through the overboard drain
mast. When the control handle is placed in the DRAIN position and pulled, the potable water is
drained from the tank through the drain mast. The control handle must be returned to the
vertical (closed) position or the serving door will not close.
Flight Crew Operating Manual
CSP A--013
MASTER
Vol. 1
WATER AND WASTE SYSTEMS
Potable Water System
LEGEND
Electrical connection.
Mechanical connection.
Fill line.
Overflow line.
Drain line.
Pressure supply line.
21--20--3
REV 56, Jan 31/03
COFFEE MAKER
AND WATER
DISPENSER
WITH DRAIN PAN
GALLEY
VENT
GALLEY
CONTROL
PANNEL
OVERFLOW
PORT
GALLEY
SINK
FILL
VALVE
CABIN FLOOR (REF)
ELECTRONIC
CONTROL
UNIT
TANK
VENT
GALLEY
WATER TANK
ASSEMBLY
P
FILTER
PX SW
PRESSURE
MANIFOLD
DRAIN VALVE
HEATED DRAIN
MAST (FWD)
WATER FILL PORT
DUSTCAP
FILL AND DRAIN
HANDLE
Potable Water Service and Drain Panel
Galley Potable Water System
Figure 21--20--1
Flight Crew Operating Manual
CSP A--013
MASTER
21--20--4
Vol. 1
WATER AND WASTE SYSTEMS
Potable Water System
REV 56, Jan 31/03
FILL
VALVE
LAVATORY
ECU
PRESSURE
RELIEF
VENT
MANIFOLD
LAVATORY
WATER
TANK
ASSEMBLY
FAUCET
SWITCH
P
DRAIN
MANIFOLD
WASHBASIN
FILTER
SHUTOFF
VALVE
LEGEND
Electrical connection.
Mechanical connection.
Fill line.
Overflow line.
Drain line.
Pressure supply line.
HEATED DRAIN
MAST (AFT)
WATER FILL PORT
DUSTCAP
FILL AND DRAIN
HANDLE
Potable Water Service and Drain Panel
Lavatory Water System
Figure 21--20--2
Flight Crew Operating Manual
CSP A--013
MASTER
WATER AND WASTE SYSTEMS
Potable Water System
GALLEY POWER Switch (green)
ON:
Activates heater system,
Turns on level control system
OFF:
De--activates heater system,
Turns off level sensing.
21--20--5
Vol. 1
REV 56, Jan 31/03
LAVATORY POWER Switch (green)
ON:
Activates heater system,
Turns on level control system
OFF:
De--activates heater system,
Turns off level sensing.
NOTE
15 minute total warm--up sequence.
WATER LEVEL Indicators (green)
Come on to indicate water level in
corresponding tanks. Tank heaters
will not come on if E (empty)
indicator is off. Will flash to indicate
control failure.
EMPTY Indicators (green)
Go off to indicate corresponding
tanks empty. Tank heaters and
pumps, automatically deactivated.
Will flash during warm--up sequence.
OVERHEAT Indicators (amber)
Steady -- Comes on to indicate an overheat.
The heaters are automatically de--activated.
Flashing -- Comes on to indicate a heater
control malfunction. The heaters are
automatically de--activated.
Water System Circuit Breakers
Used to protect the following:
Galley and lavatory pumps control
system.
Galley and lavatory tank heaters.
Galley and lavatory heating system.
Galley Control Panel
Figure 21--20--3
Flight Crew Operating Manual
CSP A--013
MASTER
A.
21--20--6
Vol. 1
WATER AND WASTE SYSTEMS
Potable Water System
REV 56, Jan 31/03
System Circuit Breakers
SYSTEM
SUB--SYSTEM
CB NAME
Potable Waste WASTE
System
SYSTEM
Water System
Control Logic
Lavatory Tank
Heaters
Lavatory Line
Heaters
Potable Water
Galley
System
Lavatory
WATER CONT
WATER HTRS
LINES
WATER HTRS
TANKS
GALLEY
CONT & IND
GALLEY TANK
HTR
GALLEY LINE
HTRS
LAVATORY
CONT & IND
LAVATORY
TANK HTR
LAVATORY
LINE HTRS
BUS BAR
CB
CB
PANEL LOCATION
NOTES
U4
DC SERVICE
BUS
U5
2
AC UTIL BUS
2
D13--D14
D15
DC SERVICE
AC UTIL BUS
2
DC SERVICE
Ci i
Circuit
Breakers
are
located on
the Galley
Control
Panel
AC UTIL BUS
2
Flight Crew Operating Manual
CSP A--013
MASTER
WATER AND WASTE SYSTEMS
Lavatory Waste System
1.
21--30--1
Vol. 1
REV 56, Jan 31/03
LAVATORY WASTE SYSTEM
The lavatory waste system stores waste material from the lavatory toilet and provides a
means of flushing the toilet bowl. The toilet assembly is self-contained and consists of a
integral seat and bowl assembly, holding tank, electric pump, timer, filter, flush handle and
service panel.
The holding tank holds the deodorant flushing solution and waste material until removed by
ground servicing personnel.
When the toilet flush handle is pushed, a timer energizes the electric pump for 10 seconds.
The pump draws the flushing fluid from the tank, through a filter, and sends it out through the
bowl assembly flush ring.
The system is serviced by means of a lavatory service panel, located on the right side of the
aft fuselage. When the service vehicle drain line is connected to the drain port, the T-handle
is pulled then rotated to the left. This opens the holding tank drain valve, on the bottom of
the tank, allowing the tank to empty through the drain line.
Once the holding tank is emptied, rinsing agent and flushing fluid are sent through the
charging port, flushing and cleaning the tank and lines. The T-handle is then turned to the
right and pushed in to close the drain valve. The tank is then filled with precharge flushing
fluid until the fluid level light on the service panel illuminates.
The toilet requires a precharge of 2.3 US gallons (8.7 liters) of flushing fluid.
Flight Crew Operating Manual
CSP A--013
MASTER
Vol. 1
WATER AND WASTE SYSTEMS
Lavatory Waste System
21--30--2
REV 56, Jan 31/03
LAVATORY
FLUSH
HANDLE
BOWL
ASSEMBLY
CHECK
VALVE
LEGEND
Mechanical connection
Ground rinse inlet tubing
Lavatory waste duct assembly
HOLDING
TANK
DRAIN VALVE
TIMER
MOTOR
VENT
FILTER
AND PUMP
DRAIN
CONNECTION
RINSE
CONNECTION
WASTE DUMP
CABLE T--HANDLE
T Handle
Used to open drain valve.
Waste Valve
Used to drain tank.
Precharge Port
Used to flush tank and
precharge system.
Vent
Precharge Lamp
Indicates system is at
precharge level.
Push light to test lamp.
NOTE
Access panel can not be closed
unless waste valve and precharge
port covers are closed and locked
and drain valve T handle is locked.
Lavatory Service Panel
Waste Disposal System
Figure 21---30---1
Flight Crew Operating Manual
CSP A--013
MASTER
A.
REV 56, Jan 31/03
System Circuit Breakers
SYSTEM
Lavatory
Waste
S t
System
21--30--3
Vol. 1
WATER AND WASTE SYSTEMS
Lavatory Waste System
SUB--SYSTEM
Toilet
Waste
CB NAME
TOILET
WASTE SYST
WATER CONT
BUS BAR
CB
CB
PANEL LOCATION
AC SERVICE
DC SERVICE
Flight Crew Operating Manual
CSP A--013
S2
2
U4
U5
MASTER
NOTES
WATER AND WASTE SYSTEMS
Lavatory Waste System
Vol. 1
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Flight Crew Operating Manual
CSP A--013
MASTER