737 MAX Flight Crew Operations Manual
Airplane General, Emergency
Equipment, Doors, Windows -
Systems Description
MN-FLT-OH-201
1.40.49
Electrical Power
Electricity for the galleys is 115V AC supplied from the airplane transfer buses
and controlled by a switch on the overhead panel. Circuit breakers are located in
the lower E/E bay as part of the power distribution panels.
Water Service
Water is supplied to the galleys from the airplane pressurized water system and, in
an emergency, may be shut off at the galley.
Water System
The potable airplane water system is supplied from a single tank located behind
the aft cargo compartment. Fresh water is supplied to the galleys and lavatory
sinks.
Quantity Indication and System Operation
A quantity indicator is located on the attendant panel. The system is pressurized
by engine bleed air or by the water system air compressor. Shutoff valves are
located on each galley and below the sink in each lavatory. The drain position of
this valve is used to drain all water overboard. Normally, the drain shutoff valves
are ON.
WATER SYSTEM
LAVATORY
EXTERNAL
WATER TANK
LAVATORY
QUANTITY
INDICATOR
LINE
GALLEY
SERVICE PANEL
DISTRIBUTION
(TYP)
GALLEY
March 1, 2021
