LAVATORY
DISTRIBUTION WATER TANK LINE EXTERNAL SERVICE PANEL
GALLEY (TYP)
AIR PRESSURE LINE
LAVATORY
Forward Airstair (As Installed)
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.
December 5, 2003 1.40.37
Airplane General, Emergency Equipment, Doors, Windows -Systems Description 737 Operations Manual
Interior Control
The interior control panel is located on the forward attendant’s panel. An amber 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 around the handle. When operating the airstair with the exterior control, the forward entry door need not be open. The exterior control handle by–passes the door–open requirement. The control handle is normally flush with the fuselage. Pushing the button in the center of the handle extends the handle for easy operation. The handle rotates clockwise or counterclockwise to extend or retract the airstair. A two–position switch, labeled NORMAL and STANDBY, is located in the exterior handle 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 control handle rotates to extend or retract 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. An amber 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 illuminates in normal or standby operation of the airstair.
Copyright . The Boeing Company. See title page for details.
1.40.38 December 5, 2003
Airplane General, Emergency Equipment, Doors, Windows -Systems Description
737 Operations Manual
Forward Airstair
FORWARD ENTRY DOOR (COCKED POSITION)
FORWARD HANDRAIL RETRACTED AFT HANDRAIL EXTENDED
AIRSTAIR
EXTERIOR
CONTROL
WARNING: Use care not to fall from the airstair platform when operating the forward entry door. The small platform area and bad weather can make the door difficult to operate.
Copyright . The Boeing Company. See title page for details.
June 4, 2004 1.40.39
Airplane General, Emergency Equipment, Doors, Windows -Systems Description 737 Operations Manual
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