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Oxygen Masks & Regulators
(Goggles If Required)....................................................... ON; 100%
The 100 % OXYGEN position must be used to prevent the inhalation of
smoke or fumes. If smoke concentration affects vision, don goggles
and use the EMERGENCY position on the oxygen regulator and open the
mask valve to clear the goggle of smoke.
Crew Communications ........................................................ESTABLISH
Press crew interphone receiver down and set volume arrow at 12
o’clock or greater. Set mask / boom selector to MASK. Use I/C toggle
on audio selector panel or bottom position on YOKE ROCKER switch
when speaking to other pilot.
Recirculation Fan Switch(s)...............................................................OFF
To eliminate possible source of smoke.
IF Smoke Stops:
Continue flight with the recirculation fan switch(s) OFF.
* * * *
IF Smoke Continues:
Isolation Valve Switch........................................................... CLOSE
Prevents the isolation valve from opening in the following
procedural step.
R Pack Switch ..............................................................................OFF
Eliminates Engine No. 2 bleed air and the right pack as a possible
source of air conditioning smoke.
(Continued)
OR
AIR SYSTEMS
Sec. 2.2 Page 2
Rev. 11/15/02 #41
Continental
737
Flight Manual
IF Smoke Stops:
Continue flight with the right pack switch OFF and isolation valve
switch in the CLOSE position.
* * * *
IF Smoke Continues:
R Pack Switch ....................................................................AUTO
L Pack Switch .......................................................................OFF
Eliminates Engine No. 1 bleed air and the left pack as a
possible source of air conditioning smoke.
IF Smoke Stops:
Continue flight with the left pack switch OFF and the isolation
valve switch in the CLOSE position.
* * * *
IF Smoke Continues:
L Pack Switch.............................................................AUTO
Land At Nearest Suitable Airport.
Accomplish the SMOKE / FUMES REMOVAL checklist in FIRE
PROTECTION section, if required.
* * * *
OR
OR
737
Flight Manual
Continental
AIR SYSTEMS
Sec. 2.2 Page 3
Rev. 11/15/02 #41
AUTO FAIL OR UNSCHEDULED
PRESSURIZATION CHANGE
IF BCD A DISPLAYS CONTROL PANEL annunciation is displayed on
the captain’s altimeter. This indicates a failure of the Captain’s EFIS
control panel. All barometric corrections to the AUTO and ALTN
pressurization controllers are lost.
BCD Displays Control Panel Select Switch
(On Overhead Panel) ...............................................BOTH ON 2
Verify DISPLAYS CONTROL PANEL annunciation and ALTN flag
extinguish, and altimeter reappears.
* * * *
IF The AUTO FAIL light has illuminated, it indicates the automatic mode has
failed. Illumination of the STANDBY / ALTN light indicates the
pressurization system has automatically changed to the
standby/alternate mode.
An unscheduled pressurization change is indicated by inappropriate
change in cabin altitude.
Increasing thrust may insure adequate air supply to control cabin
altitude.
>>@ Pressurization Mode Selector ........STBY/ALTN
Refer to the STANDBY / ALTN OPERATION checklist.
BCD Pressurization Mode Selector...................ALTN
The AUTO FAIL light extinguishes. Set cabin altitude using cabin/flight
altitude placard, before descent set landing field elevation minus 200
feet (as required).
IF STBY / ALTN Mode Cannot Maintain Cabin Pressurization:
Pressurization Mode Selector ....................... MAN DC / MAN
Outflow Valve Switch.......................................AS REQUIRED
Operate the outflow valve to maintain proper cabin altitude
and cabin rate of change. At traffic pattern altitude, position
the outflow valve to full OPEN.
* * * *
OR
AIR SYSTEMS
Sec. 2.2 Page 4
Rev. 11/15/02 #41
Continental
737
Flight Manual
AUTOMATIC PRESSURIZATION CONTROL
LANDING AIRPORT ELEVATION ABOVE 6000 FEET
Use this procedure when the landing airport elevation is above 6000 feet to
maintain the cabin at a lower altitude for reduced crew and passenger fatigue.
IF Flights Less Than One Hour:
Use Normal Procedures
Note: On very short flights where large changes in cabin altitude are
required, it may be necessary to use STANDBY mode (if
installed) and increase CABIN RATE to achieve the desired
cabin altitude in the time available.
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