Vol. 1 21--00--1
REV 56, Jan 31/03
WATER AND WASTE SYSTEMS
Table of Contents
Flight Crew Operating Manual
CSP A--013
MASTER
CHAPTER 21 -- WATER AND WASTE SYSTEMS
Page
TABLE OF CONTENTS 21--00
Table of Contents 21--00--1
INTRODUCTION 21--10
Introduction 21--10--1
POTABLE WATER SYSTEM 21--20
Potable Water System 21--20--1
Servicing 21--20--2
System Circuit Breakers 21--20--6
LAVATORY WASTE SYSTEM 21--30
Lavatory Waste System 21--30--1
System Circuit Breakers 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 21--20--3
Figure 21--20--2 Lavatory Water System 21--20--4
Figure 21--20--3 Galley Control Panel 21--20--5
LAVATORY WASTE SYSTEM
Figure 21--30--1 Waste Disposal System 21--30--2
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WATER AND WASTE SYSTEMS
Table of Contents
Flight Crew Operating Manual MASTER
CSP A--013
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Vol. 1 21--10--1
REV 56, Jan 31/03
WATER AND WASTE SYSTEMS
Introduction
Flight Crew Operating Manual
CSP A--013
MASTER
1. 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.
REV 56, Jan 31/03
Vol. 1 21--10--2
WATER AND WASTE SYSTEMS
Introduction
Flight Crew Operating Manual MASTER
CSP A--013
Potable Water and Waste Systems ---General Arrangement
Figure 21---10---1
AFT
DRAIN
MAST
AFT
WATER
TANK
SERVICE
PANEL
WASHBASIN
SUPPLY LINE
WASHBASIN
FAUCET
WASHBASIN
DRAIN LINE
GALLEY WATER
SUPPLY LINE
FORWARD
DRAIN MAST
FORWARD
WATER TANK
(UNDER FLOOR)
FORWARD
WATER TANK
SERVICE PANEL
SERVICE
DOOR (REF)
GALLEY
DRAIN
LINE
AFT
WATER
TANK
DRAIN
LINE
AFT WATER
TANK (CARGO BAY)
TOILET
DRAIN/SERVICE
PANEL
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WATER AND WASTE SYSTEMS
Potable Water System
Flight Crew Operating Manual
CSP A--013
MASTER
1. 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
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