737 Flight Crew Operations Manual
Supplementary Procedures -
Air Systems
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
SP.2.4 D6-27370-866-EGP
Outflow valve switch (momentarily) ................................ CLOSE
During descent, intermittently position the outflow valve switch
toward CLOSE, observing cabin altitude decrease as the airplane
descends.
Before entering the landing pattern, slowly position the outflow valve
to full open to depressurize the airplane. Verify differential pressure
is zero.
Pressurization Control Operation – Landing at Alternate
Airport
At top of descent:
LAND ALT Indicator ............................................................ Reset
Reset to new destination field elevation.
Automatic Pressurization Control – Landing Airport Elevation
Above 6000 Feet
Do the normal Preflight Procedure - First Officer except as modified
below.
Prior to takeoff:
LAND ALT indicator .............................................. 6000 feet
At initial descent or approximately 20 minutes prior to landing:
LAND ALT indicator ...................Destination field elevation
Unpressurized Takeoff and Landing
When making a no engine bleed takeoff or landing with the APU
inoperative, or operative but not providing bleed air:
Takeoff
PACK switches .............................................................................. AUTO
ISOLATION VALVE switch ....................................................... CLOSE
Engine BLEED air switches..............................................................OFF
APU BLEED air switch ....................................................................OFF
September 24, 2015
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