737 Flight Crew Operations Manual
Duct pressure..................................................................20 psi minimum
If external air cannot hold 20 psi minimum and the APU is operating: ISOLATION VALVE switch ................................................... AUTO APU BLEED air switch ................................................................ ON
APU supplies left pack and external air source supplies right
pack.
Ground Air Conditioning Cart Use
Before connecting ground air conditioning cart: PACK switches ............................................................................OFF Allows cart to operate at maximum efficiency After disconnecting ground air conditioning cart: PACK switches ................................................................ As required
Isolated Pack Operation during Engine Start
To improve cabin air quality between starting the first and second engine:
CAUTION: Moving engine BLEED air switches while a starter is engaged can damage the starter.
Engine No. 2 .....................................................................................Start
After engine No. 2 stabilized: ISOLATION VALVE switch ................................................. CLOSE Right PACK switch .................................................................. AUTO Duct pressure ...................................................................... Stabilized
Engine No. 1 .....................................................................................Start After engine No. 1 stabilized: ISOLATION VALVE switch ................................................... AUTO
Pressurization System Manual Mode Test
PACK switches..................................................................................OFF
Copyright . The Boeing Company. See title page for details.
SP.2.2 March 29, 2004
Supplementary Procedures -Air Systems
737 Flight Crew Operations Manual
Pressurization mode selector .......................................................... MAN AUTO FAIL and ALTN lights – extinguished. MANUAL light – illuminated.
Outflow valve switch ................................................................... CLOSE Verify outflow valve position indicator moves toward CLOSE. Outflow valve switch ..................................................................... OPEN Verify outflow valve position indicator moves toward OPEN.
Pressurization mode selector .........................................................AUTO Verify outflow valve position indicator moves toward OPEN. MANUAL light – extinguished.
Manual Mode Operation
CAUTION: Switch actuation to the manual mode causes an immediate response by the outflow valve. Full range of motion of the outflow valve can take up to 20 seconds.
Pressurization mode selector .......................................................... MAN MANUAL light – illuminated
CABIN/FLIGHT ALTITUDE placard .......................................... Check Determine the desired cabin altitude. If a higher cabin altitude is desired: Outflow valve switch (momentarily) ....................................... OPEN Verify the outflow valve position indicator moves right, cabin altitude climbs at the desired rate, and differential pressure decreases. Repeat as necessary. If a lower cabin altitude is desired: Outflow valve switch (momentarily) ..................................... CLOSE Verify the outflow valve position indicator moves left, cabin altitude descends at the desired rate, and differential pressure increases. Repeat as necessary.
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Air Systems 737 Flight Crew Operations Manual
During Descent
Thrust lever changes should be made as slowly as possible to prevent excessive pressure bumps.
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 switch to full open to depressurize the airplane. Verify differential pressure is zero.
Pressurization Control Operation – Landing at Alternate Airport
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