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Passenger Oxygen Masks.................................... CHECK DEPLOYED
If the PASS OXY ON light is not illuminated, move the switch to ON.
Transponder (If Not In Contact With ATC)...................................7700
Pressurization ....................ATTEMPT TO CONTROL MANUALLY
L & R Pack Switches ................................................................... HIGH
Pressurization Mode Selector ....................................MAN DC / MAN
Outflow Valve Switch................................................................CLOSE
Note: If pressurization is restored, continue manual operation.
Emergency descent may be terminated if cabin altitude is
controllable, and alternative options for continuation of the
flight to destination, diversion, or alternate airport can be
reviewed.
Operate outflow valve to maintain proper cabin altitude and cabin rate
of change.
Altimeters..............................................................................................SET
(Continued)
AIR SYSTEMS
Sec. 2.2 Page 10
Rev. 11/15/02 #41
Continental
737
Flight Manual
Level Off Altitude...........10,000 FEET CABIN ALTITUDE OR MEA
(WHICHEVER HIGHER)
Once the aircraft has safely descended to 10,000 feet cabin altitude or
MEA (whichever higher), further descent to at or below 10,000 feet
should be considered if weather, terrain, and fuel permit.
Communication capabilities may be significantly enhanced if and when
the flight crew can remove oxygen masks.
- - - - - AFTER LEVEL OFF - - - - -
Speed brake...................................................................DOWN DETENT
Crew Oxygen Masks & Regulators ...........................(AS REQUIRED)
Flight crew must use oxygen when cabin altitude is above 10,000 feet.
To conserve oxygen, position NORMAL/100% selector to NORMAL.
Start Switches ...............................................................(AS REQUIRED)
Select OFF, CONT, or FLT as flight conditions dictate.
Passenger Address ............................. ADVISE F/A’s OF SITUATION
The new course of action is based on weather, oxygen, fuel remaining,
and available airports. Use of long range cruise may be appropriate.
Refer to IN RANGE checklist when appropriate.
* * * *
737
Flight Manual
Continental
AIR SYSTEMS
Sec. 2.2 Page 11
Rev. 11/15/02 #41
>>@ CABIN DIFFERENTIAL PRESSURE CHART
* * * *
DUAL BLEED LIGHT
The DUAL BLEED light illuminated indicates the APU bleed valve is open and
either:
No. 1 engine bleed switch is ON, or
No. 2 engine bleed switch is ON and the isolation valve is OPEN.
Limit engine thrust to idle while light is illuminated. Reposition switches to
extinguish light. The DUAL BLEED light illuminated is normal for starting.
After Engine Start:
APU Bleed Air Switch................................................................................OFF
* * * *
AIR SYSTEMS
Sec. 2.2 Page 12
Rev. 11/15/02 #41
Continental
737
Flight Manual
>>@B DUCT OVERHEAT
The DUCT OVERHEAT light illuminated indicates that supply duct temperature has
exceeded limits. The mix valve automatically moves to full cold.
Temperature Selector.......................................COOLER TEMPERATURE
Selecting a cooler temperature prevents the mixing valve from
programming back to an overheat condition.
Trip Reset Button ...................................................................................PRESS
The system may be reset as soon as the duct cools. The air mix valve
programs to the new selected temperature, and the DUCT OVERHEAT light
extinguishes if the duct temperature has cooled below limits. Allow
approximately 2 minutes for temperature to cool.
IF DUCT OVERHEAT Light Extinguishes:
Proceed normally.
* * * *
IF Duct Temperature Increases Rapidly Or The Mix Valve Indicator Moves
Toward Full Hot:
Temperature Selector........................................................MANUAL
Adjust the air mix valve position as required.
* * * *
OR
737
Flight Manual
Continental
AIR SYSTEMS
Sec. 2.2 Page 13
Rev. 11/15/02 #41
EMERGENCY DESCENT PROCEDURE
This maneuver is desired to bring the aircraft down smoothly to a safe cabin
altitude in the minimum time with the least possible passenger discomfort. It is
intended as a specialized case to cover an uncontrollable loss of cabin
pressurization. When it is used for other than pressurization problems or
contamination of cabin atmosphere, the oxygen procedures may be omitted.
Don oxygen masks and establish crew communication at the first indication of a
　
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