Supplementary Procedures -Airplane General, Emer. Equip., Doors, Windows
Water Heaters .............................................................................. OFF
Fill and Overflow valve............................................................OPEN
Tank Drain valve ...................................................................... OPEN
Shutoff/Drain valves...............................................................DRAIN
When water stops flowing from outlets:

Fill and Overflow valve .................................................... CLOSE
Tank Drain valve ............................................................... CLOSE
Shutoff/Drain valves ................................................................ON

Open each lavatory faucet and galley outlet to drain residual water.
Forward Airstair Operation
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.
CAUTION: Do not move airplane with stair extended.
CAUTION: Operation of airstair in winds exceeding 40 knots is not recommended.
Interior Control
WARNING:Open entry door to cocked position to allow clear visibility of area outside airplane to prevent injury to personnel. Do not open door beyond cocked position while operating airstair.
To Extend:
Forward Entry Door ....................................Open to Cocked Position When operating the airstair from the interior control panel, the forward entry door must be open to the cocked position. Safety circuits prevent airstair operation if the entry door is closed.
Supplementary Procedures -Airplane General, Emer. Equip., Doors, Windows 737 Operations Manual

Control Switch .................................................................... EXTEND

Note: For interior standby operation, the battery switch must be ON and (on airplanes delivered prior to November, 1991) 115 V AC power available.
Hold until extension is complete.
The STAIRS OPERATING light illuminates during extension
until the airstair is fully extended.
Note: The STAIRS OPERATING light will not illuminate with loss of AC power.
Control switch .........................................................................Release

Handrail Extensions ................................................................ Engage Release latch and pull inboard and up, extend and engage on supports at sides of forward entry doorway.
To Retract:
Handrail Extensions ........................................................... Disengage Disengage from door supports, depress latch at base of forward extension to permit retraction within upper segment of handrail. Slide right and left extensions down along upper rails. Stowing in appropriate stowage points provides circuit continuity for energizing retract relay.
CAUTION: Use of the standby control switch bypasses all safety circuits. Airstair handrail extensions must be stowed or substantial damage could result.
Control switch...................................................................RETRACT Hold until retraction is complete. The STAIRS OPERATING light illuminates during retraction
until the airstair door is fully closed.
Note:  The STAIRS OPERATING light will not illuminate with loss of AC power.
Control switch .........................................................................Release

Copyright . The Boeing Company. See title page for details.
SP.1.4   June 4, 2004

Supplementary Procedures -Airplane General, Emer. Equip., Doors, Windows
Exterior Control
To Extend: Control Handle ................................... Push Button to Extend Handle Control Handle .........................................................Rotate to Extend
Hold control handle in position until entire extension cycle is complete. Control Handle ....................................................................... Release Forward entry door .......................................Open to cocked position
WARNING:Extend and connect the airstair aft handrail to protect against falling and to prevent injuries to personnel.
Aft handrail extension .............................................................Engage

Release latch and pull inward and up, extend and engage on the
support at the side of the forward entry door.
WARNING:Step down the airstair as the forward entry door moves to the open position to prevent injuries to personnel.
Forward entry door ............................................................ Fully open Forward handrail extension .....................................................Engage Release latch and pull inboard and up, extend and engage on the support side of the forward entry door. To Retract:
　
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