Forward handrail extension .................................................... Engage Release latch and pull inboard and up, extend and engage on the support at the side of the forward entry door.
To Retract:
WARNING:Do not disengage the airstair aft handrail at this time. Injuries to personnel can occur during forward entry door operations if the aft handrail is disengaged.
Forward handrail extension ............................................... Disengage

Disengage from door support, 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.
WARNING:Step down the airstair as the forward entry door moves to the cocked position to prevent injuries to personnel.
Forward entry door ......................................Close to cocked position

Aft handrail extension ........................................................ Disengage

Disengage from door support, 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.
Copyright . The Boeing Company. See title page for details.

Supplementary Procedures -Airplane General, Emer. Equip., Doors, Windows
737 Flight Crew Operations Manual
Forward entry door ............................................................ Fully close

CAUTION: Use of the standby control switch bypasses all safety circuits. Airstair handrail extension must be stowed or substantial damage could result.
Normal mode: AIRSTAIRS switch ..................................................... RETRACT
Standby mode: POWER switch .............................................. Hold in STANDBY AIRSTAIRS switch ..................................................... RETRACT
Oxygen Mask Microphone Test
MASK-BOOM switch .................................................................. MASK
RESET/TEST .................................................................... Push and hold
EMERGENCY/TEST selector .......................................... Push and hold

YA613, YA686, YA687 FLT INT............................................................................................Push Verify oxygen flow sound is heard through the flight deck loudspeaker. YA626 - YK104 INTERPHONE transmitter selector and receiver switches .......................................................................Push Verify oxygen flow sound is heard through the flight deck loudspeaker. YA626 - YK104 Push-to-Talk switch .............................................................................I/C
Simultaneously push the Push-to-Talk switch, EMERGENCY/TEST selector and the RESET/TEST switch. Verify oxygen flow sound is heard through the flight deck
loudspeaker.
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Airplane General, Emer. Equip., Doors, Windows 737 Flight Crew Operations Manual

YA613 Push-to-Talk switch ............................................................................INT
Simultaneously push the Push-to-Talk switch, EMERGENCY/TEST selector and the RESET/TEST switch. Verify oxygen flow sound is heard through the flight deck
loudspeaker.
Push-to-Talk switch ......................................................................Release
EMERGENCY/TEST selector .....................................................Release
RESET/TEST ...............................................................................Release
MASK-BOOM switch ................................................................. BOOM

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

737 Flight Crew Operations Manual

Wing–Body Overheat Test
Wing–body OVHT TEST switch .....................................................Push Hold for a minimum of 5 seconds. Both WING–BODY OVERHEAT lights – illuminated MASTER CAUTION – illuminated AIR COND system annunciator – illuminated Wing–body OVHT TEST switch ................................................ Release Both WING–BODY OVERHEAT lights – extinguished MASTER CAUTION lights – extinguished AIR COND system annunciator – extinguished
External Air Cart Use
CAUTION: The BAT switch should always be on when using the airplane air conditioning system since the protective circuits are DC. This ensures protection in the event of loss of AC power.
Note: For engine start with a ground air source, see section SP.7. APU BLEED air switch .................................................................... OFF ISOLATION VALVE switch ......................................................... OPEN
　
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