Drain valves for coffee maker and
water boiler (if installed) .....................................................CLOSED
Forward lavatory drain valve ...............................................CLOSED
Tank drain valve handle .......................................................CLOSED
Water service panel .................................................................... Close
Drain line ............................................... Disconnect from drain ports

Copyright . The Boeing Company. See title page for details.

Supplementary Procedures -Airplane General, Emer. Equip., Doors, Windows
737 Flight Crew Operations Manual
If the potable water tank will not be refilled immediately after the system is emptied, open the following circuit breakers and attach DO–NOT–CLOSE tags:
P18–3 circuit breaker panel
.
LAVATORY WATER HEATER A

.
LAVATORY WATER HEATER D

.
LAVATORY WATER HEATER E

Power distribution panel number 1

.
POT WATER COMPRESSOR

.
WATER QTY IND

Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Airplane General, Emer. Equip., Doors, Windows 737 Flight Crew Operations Manual

Forward Airstair Operation YC411, YC413
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: Operation of airstair in winds exceeding 40 knots is not recommended.
CAUTION: Do not move airplane with stair extended.
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.
Control switch ..................................................................... EXTEND

Note: For interior standby operation, the battery switch must be ON.
Hold until extension is complete.
The STAIRS OPER light illuminates during extension until the
airstair is fully extended.
Note: The STAIRS OPER 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 the supports at the sides of the forward entry doorway.
Copyright . The Boeing Company. See title page for details.

Supplementary Procedures -Airplane General, Emer. Equip., Doors, Windows
737 Flight Crew Operations Manual
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 OPER light illuminates during retraction until the
airstair door is fully closed. Note: The STAIRS OPER light will not illuminate with loss of AC power.
Control switch ........................................................................ Release

Exterior Control
To Extend: Normal mode: AIRSTAIRS switch ........................................................EXTEND
Standby mode: POWER switch .............................................. Hold in STANDBY AIRSTAIRS switch ........................................................EXTEND
Forward entry door .......................................Open to cocked position

WARNING:Extend and connect the airstair aft handrail to protect against falling and prevent injuries to personnel.
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Airplane General, Emer. Equip., Doors, Windows 737 Flight Crew Operations Manual

Aft handrail extension ............................................................. Engage Release latch and pull inboard 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.
　
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