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enroute altitude whichever is higher. The Pilot Monitoring will call out 2,000
feet above and 1,000 feet above level off altitude.
When turbulent air is encountered or expected, reduce to turbulent air
penetration speed (280 IAS or .73 Mach >>@ / .76 Mach BCD
whichever is lower).
If descending into icing conditions, use engine and wing anti-ice and thrust as
required.
If structural integrity is in doubt, limit speed as much as possible, preferably at
or below the existing speed, and avoid high maneuvering loads.
After Level Off
Recheck pressurization system and evaluate the situation. Do not remove the
crew oxygen masks if cabin altitude remains above 10,000 feet. Determine new
course of action based on weather, oxygen, fuel remaining and available
airports, and obtain new ATC clearance.
AIR SYSTEMS
Sec. 2.2 Page 16
Rev. 11/15/02 #41
Continental
737
Flight Manual
EMERGENCY DESCENT
Structural Integrity Satisfactory
737
Flight Manual
Continental
AIR SYSTEMS
Sec. 2.2 Page 17
Rev. 11/15/02 #41
EQUIPMENT COOLING OFF
> The EQUIPMENT COOLING OFF light illuminated indicates a loss of airflow in
the equipment cooling system.
Equipment Cooling Switch.......................................................ALTERNATE
>@BCD The EQUIPMENT COOLING SUPPLY or EXHAUST OFF light
illuminated indicates a loss of airflow from the selected cooling fan.
Equipment Cooling Supply / Exhaust Switch (As Req.) ......ALTERNATE
Establish a new source of equipment cooling airflow. The light should
extinguish within approximately 5 seconds.
No further action is necessary in flight if the EQUIPMENT COOLING OFF light does
not extinguish.
* * * *
AIR SYSTEMS
Sec. 2.2 Page 18
Rev. 11/15/02 #41
Continental
737
Flight Manual
MANUAL MODE OPERATION
This mode is required if the cabin altitude, rate of climb, and differential
pressure do not respond to the standby / alternate mode inputs to the
pressurization controller. The AUTO FAIL and/or STANDBY / ALTN lights may be
illuminated.
Caution: Switch actuation in manual will cause an immediate response of
the outflow valve. Momentary actuation, (toggling) of manual
switch should be employed.
Pressurization Mode Selector ............................................. MAN DC / MAN
Check MANUAL light illuminated.
Selection of MAN DC will provide slower valve position changes.
Cabin / Flight Altitude Placard .........................................................CHECK
Determine the desired cabin altitude.
IF A Higher Cabin Altitude is Desired:
Outflow Valve Switch (Momentarily)............................................OPEN
Check 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
Check the outflow valve position indicator moves left, cabin altitude
descends at the desired rate, and differential pressure increases.
Repeat as necessary.
During Descent
Throttle 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 aircraft descends.
Before entering the landing pattern, slowly position the outflow valve
switch to full OPEN, depressurizing the aircraft, and check that
differential pressure is zero.
* * * *
737
Flight Manual
Continental
AIR SYSTEMS
Sec. 2.2 Page 19
Rev. 11/15/02 #41
OFF-SCHEDULE DESCENT
The OFF-SCHEDULE DESCENT light illuminated indicates that the selected flight
altitude has not been reached and the aircraft is descending.
IF Returning To Departure Airport:
No action is necessary if the aircraft is returning to the airport of departure
for landing.
* * * *
IF Not Landing At Airport Of Departure:
Flight Altitude Indicator ...............................................................RESET
Reset to actual aircraft altitude.
Land Altitude Indicator ........................................(If Required) RESET
* * * *
OR
AIR SYSTEMS
Sec. 2.2 Page 20
Rev. 11/15/02 #41
Continental
737
Flight Manual
B PACK TRIP OFF / CD PACK
Note: A PACK TRIP OFF or PACK light illuminated indicates the related pack
temperature has exceeded limits, or both primary and standby pack
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