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controls have failed. If a pack light illuminates on recall check, either
the primary or the standby control has failed.
If PACK light does not extinguish when Master Caution system is reset:
Do Not Takeoff.
All Temperature Selectors........... SELECT WARMER TEMPERATURE
Reduces the work load on the affected air conditioning pack.
Trip Reset Button ...................................................................................PRESS
If the PACK light illuminated as a result of the pack temperature exceeding
limits, the light extinguishes if the pack temperature has cooled below
limits. Allow 30 seconds cooling time.
IF The PACK Light Extinguishes:
Proceed normally.
* * * *
IF One PACK Light Remains Illuminated:
Isolation Valve Switch .................................................................. CLOSE
Pack Switch (Affected Side) ...............................................................OFF
* * * *
IF Both PACK Lights Remain Illuminated:
Note: Both pack valves may have closed resulting in a gradual loss of
cabin pressure and an eventual CABIN ALTITUDE warning.
Monitor cabin altitude during the remainder of the flight.
IF Cabin Altitude Increases:
Descent ......................................................................ACCOMPLISH
Monitor cabin altitude and rate. Descend to lowest safe altitude or
10,000 feet, whichever is higher.
OR
(Continued)
OR
737
Flight Manual
Continental
AIR SYSTEMS
Sec. 2.2 Page 21
Rev. 11/15/02 #41
At level off:
Airspeed............................................................ 290 KNOTS MINIMUM
290 knots is the minimum airspeed required to maintain appropriate
cabin pressure differential with the outflow valve in the full open
position.
Pack valves may have failed in full open (hot) position.
Note: Flight deck and cabin temperatures may increase rapidly
below 290 knots depending on pack valve position.
Pressurization Mode Selector .......................................................... MAN
Outflow Valve Switch ..........................................................FULL OPEN
Right Recirculation Fan Switch .....................................................AUTO
Left Recirculation Fan Switch (If Installed)....................................OFF
IF Flight Deck And Cabin Temperatures Are Excessively Warm:
Flight Deck Door ..............................................................................OPEN
Galley or Cab / Util .............................................................................OFF
BCD IFE / Pass Seat (If Installed) ........................................OFF
In-Flight Entertainment Systems......................................................OFF
Cabin Lighting ....................................................................................DIM
Cabin Window Shades................................................................CLOSED
* * * *
AIR SYSTEMS
Sec. 2.2 Page 22
Rev. 11/15/02 #41
Continental
737
Flight Manual
>>@ PACK TRIP OFF
The PACK TRIP OFF light illuminated indicates the compressor discharge, turbine
inlet, or main distribution duct temperature has exceeded limits. This causes the
pack valve to close and the mix valve to drive to full cold.
Temperature Selector.............................................................AS REQUIRED
Select warmer temperature unless DUCT OVERHEAT light is illuminated. If a
DUCT OVERHEAT light is illuminated, select a cooler temperature.
Trip Reset Button ...................................................................................PRESS
The system may be reset as soon as the pack cools.
The air mix valve programs to the new selected temperature, and the PACK TRIP
OFF light extinguishes if the compressor discharge or turbine inlet temperature
has cooled below limits. Allow approximately 2 minutes for temperature to
cool.
IF PACK TRIP OFF Light Extinguishes:
Proceed normally.
* * * *
IF One PACK TRIP OFF Does Not Extinguish:
Isolation Valve Switch .................................................................. CLOSE
Pack Switch..........................................................................................OFF
* * * *
PASSENGER OXYGEN ON
The PASS OXY ON light illuminates to indicate that the passenger oxygen system
is activated.
* * * *
OR
737
Flight Manual
Continental
AIR SYSTEMS
Sec. 2.2 Page 23
Rev. 11/15/02 #41
STANDBY / ALTN OPERATION
- - - - - BEFORE START - - - - -
Pressurization Mode Selector ..................................................STBY / ALTN
　
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