.
hot beverage containers
.
hot cup receptacles
.
refrigeration and main storage compartments.
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Airplane General, Emergency Equipment, Doors, Windows -Systems Description
737 Flight Crew Operations Manual
Electrical control panel switches and circuit breakers to operate the above equipment are conveniently located within the galley work area. Storage space, miscellaneous drawers and waste containers are also integrated in the galley units.
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.
GALLEY
LAVATORY
QUANTITY
INDICATOR
LINE DISTRIBUTION WATER TANK
EXTERNAL
SERVICE PANEL
GALLEY
(TYP)
LAVATORY
WATER SYSTEM
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Airplane General, Emergency Equipment, Doors, Windows -Systems Description 737 Flight Crew Operations Manual
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.
Hot Water
Hot and cold water is available in all lavatories. The water heater is located below the lavatory sink. When emptied, it heats a new water charge in four minutes. An amber light is ON when the heater is operating normally. The heater has an overheat switch which turns off the heating element if an excess temperature is reached. The heater may be turned off at any time by using a manual switch on the heater. Cold water is supplied at the galleys.
Servicing
The system is serviced from an exterior panel located on the bottom right side of the aft fuselage. Pressure filling is required. Waste water from the galleys and lavatory wash basins is drained overboard through two heated drain masts. The drain masts are on the bottom of the fuselage; one forward and one aft.
Forward Airstair YC411, YC413
The forward airstair provides the capability of boarding passengers without relying on the availability of airport ground equipment. The airstair is electrically operated and may be controlled from either inside or outside the airplane. The airstair is stowed inside a compartment just below the forward entry door. The compartment has a pressure door that automatically opens before the airstair can operate. For passenger safety, upper handrails are attached to support brackets inside the entry door after the airstair is fully extended.
Copyright . The Boeing Company. See title page for details.
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Airplane General, Emergency Equipment, Doors, Windows -Systems Description
737 Flight Crew Operations Manual
Interior Control
The interior control panel is located on the forward attendant panel. A white STAIR OPER light on the panel illuminates when the airstair is in transit. The airstair tread lights on the airstair steps are controlled by a single three–position airstair Tread LIGHTS switch. With the switch in the AUTO position, the tread lights illuminate when the airstair makes contact with the ground and extinguish when the airstair retracts. The interior control panel has two modes of operation, normal and standby. The standby system provides an alternate means of electrical control in the event the normal mode of operation is not available. Normal operation requires 115V AC while standby operation requires the battery switch to be ON. Both operating modes require the forward entry door to be partially open. During normal operation the momentary extend or retract switches are depressed to operate the stairs. To operate in the standby mode, the momentary standby switch must be depressed while the retract or extend switches are also depressed.
Exterior Control
The exterior control is located to the right and below the airstair compartment. Operating instructions are located near the switches. When operating the airstair with the exterior control, the forward entry door need not be open. The exterior control switch by–passes the door–open requirement. A two–position switch, labeled NORMAL and STANDBY, is located in the exterior control recess. The switch is spring–loaded to NORMAL. Holding the NORMAL/STANDBY Switch to STANDBY provides DC power from the battery bus for airstair operation. The BAT switch on the flight deck does not need to be ON when operating the airstair on standby from the exterior control panel. The airstair control switch can be moved to extend or retract the airstair. The use of the standby system from either the interior or exterior control by–passes the handrail and lower ladder safety circuits. Caution must be exercised when using the standby system. If the upper handrail extensions are not properly stowed before retraction, damage to the airplane structure or damage to the airstair’s handrail may result. A white AIRSTAIR light, located on the overhead door caution annunciator panel, illuminates when the airstair pressure door is unlocked. Illumination of the AIRSTAIR light also activates the DOORS annunciator light and the MASTER CAUTION lights. The Airstair light is inoperative when DC bus 1 is not powered. The MASTER CAUTION and DOORS lights illuminate in normal or standby operation of the airstair.
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