Copyright . The Boeing Company. See title page for details.
December 6, 2002  1.30.21
Airplane General, Emergency Equipment, Doors, Windows -Controls and Indicators
737 Operations Manual
Water System Controls
WATER 
1/2 
1 
1  3 
4  4 
WATER 
E  F 
PUSH 

QUANTITY
GALLEY AREA
2 6
7
3
4 8
5
BELOW AFT ENTRY DOOR
1 Water Quantity Indicator Push – lights illuminate to indicate quantity of water in reservoir. Example: With reservoir half full, the E, 1/4, and 1/2 lights illuminate.
2 Water System Service Panel
3 Air Valve
Pressurizes tank and system when normal pressure sources are not available.
4 Overflow Fitting
Prevents overfilling of tank and allows venting of tank when gravity draining.
Copyright . The Boeing Company. See title page for details.
1.30.22  December 6, 2002

Airplane General, Emergency Equipment, Doors, Windows -Controls and Indicators
737 Operations Manual

Access Panel
Cannot be closed unless the fill and overflow valve and tank drain valve handles
are in the closed position.

Fill and Overflow Valve Handle
OPEN – enables filling or gravity draining water tank.
CLOSED – normal position.

Fill Fitting
Used to fill tank.

Tank Drain Valve Handle Open – drains water from tank. Closed – normal position.
Lavatory Controls

Water Heater Switch
On – activates the water heater.

Water Heater Light
Illuminated – heater operating.

Water Supply Drain Valve
.  
OPEN – the drain valve allows the water to drain from all the lavatory A and galley supply lines.

.  
CLOSE – the water from the supply lines flows to the lavatory and galley components and does not flow overboard.

Copyright . The Boeing Company. See title page for details.
1.30.24   December 3, 2004

737 Operations Manual

Introduction
This chapter describes miscellaneous airplane systems, including:
.
lighting systems . emergency egress
. oxygen systems . flight deck seats

.
fire extinguishers . galleys

.
emergency equipment . water systems

.
doors and windows . lavatories

.
cargo compartments .airstairs.

Lighting Systems
Lighting systems described in this chapter include:
.
exterior lighting . passenger cabin lighting

.
flight deck lighting . emergency lighting.

Exterior Lighting
Exterior lighting consists of these lights:
.
landing . strobe

.
runway turnoff . anti–collision

.
taxi . wing illumination

.
logo . wheel well.

.
position (navigation)

Outboard Landing Lights
Outboard landing lights are installed in the outboard flap track fairings. The lights are designed to extend and shine forward, parallel to the waterline of the airplane. The lights may be extended at any speed.
Inboard Landing Lights
Two inboard landing lights are in the wing leading edge. The lights shine forward and down in a fixed position.
Runway Turnoff Lights
Runway turnoff lights are in each wing root. The lights illuminate the area in front of the main gear.
Airplane General, Emergency Equipment, Doors, Windows -Systems Description 737 Operations Manual

Taxi Lights
The taxi light is mounted on the nose wheel strut and points in the same direction as the nose wheel. For increased service life of the taxi light, it is recommended that the taxi light not be used for takeoff and landing.
Logo Lights
On some airplanes, logo lights are located on the top of each wing tip to illuminate both sides of the vertical stabilizer.
Position Lights
The navigation lights are the standard red (left forward wingtip), green (right forward wingtip), and white (aft tip of both wings) position lights.
Strobe Lights
On some airplanes, three high intensity white strobe lights are installed on the left forward wing tip, right forward wing tip, and tail cone.
Anti–collision Lights
Two red anti–collision strobe lights are located on the top and bottom of the fuselage.
Wing Illumination Lights
Wing lights are installed on the fuselage and illuminate the leading edge of the wing.
Wheel Well Lights
Lights are installed in the wheel well of the nose gear and each main gear.
Copyright . The Boeing Company. See title page for details.
1.40.2  December 1, 2000

Airplane General, Emergency Equipment, Doors, Windows -Systems Description
　
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