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AUTO FAIL light and the ALTN light remains illuminated to indicate single channel
automatic operation.
MANUAL MODE OPERATION (AIRCRAFT WITH DCPCS)
A green MANUAL light illuminates with the pressurization mode selector in MAN
position.
Manual control of the cabin altitude is available if the AUTO and ALTN modes are
inoperative. In the MAN mode the outflow valve switch is used to modulate the
main outflow valve by monitoring the cabin altitude panel and valve position on
the outflow valve position indicator. The main outflow valve is driven by a
separate DC motor at a slower rate than the automatic modes. Outflow valve
full range of motion takes approximately 20 seconds.
AIR SYSTEMS
737 Sec. 6.2 Page 59
Flight Manual Continental Rev. 11/15/02 #41
BCD AIRCRAFT WITH DCPCS
* The controller senses only psi. References to altitudes are approximations
and vary according to density altitude. As the density of the air decreases,
the greater the change in altitude is for a given psi.
AIR SYSTEMS
Sec. 6.2 Page 60 737
Rev. 11/15/02 #41 Continental Flight Manual
>@BCD DIGITAL CABIN PRESSURE CONTROL SYSTEM
(DCPCS) CONTROLS AND INDICATORS
< Flight Altitude Indicator
· Indicates selected cruise flight altitude.
· Set before takeoff.
= Flight Altitude Selector
ROTATE – To set planned cruise flight altitude.
> Landing Altitude Indicator
· Indicates altitude of intended landing field.
· Set before takeoff.
AIR SYSTEMS
737 Sec. 6.2 Page 61
Flight Manual Continental Rev. 11/15/02 #41
? Landing Altitude Selector
ROTATE – To select planned landing field altitude.
@ AUTO FAIL (amber)
Illuminated – Automatic pressurization system failure detected.
· Indicates a single channel controller failure when ALTN light is also
illuminated.
· Indicates a dual channel controller failure when illuminated alone.
A Off Schedule Descent Light (amber)
Illuminated – Aircraft descends before reaching the planned cruise flight
altitude set in the Flight Altitude Indicator.
B Alternate Light (green)
Illuminated – Pressurization system operating in alternate automatic mode.
· With the Pressurization Mode Selector in the AUTO position,
illumination of both ALTN and AUTO FAIL lights indicate a single channel
controller failure and automatic transfer to the ALTN mode.
· Pressurization Mode Selector in the ALTN position.
C MANUAL Light (green)
Illuminated – Pressurization system operating in manual mode.
D Outflow Valve Position Indicator
· Indicates position of main outflow valve.
· Operates in all modes.
Outflow Valve Switch (spring-loaded to center)
OPEN – Opens main outflow valve electrically with the Pressurization Mode
Selector in MAN position.
CLOSE – Closes main outflow valve electrically with the Pressurization
Mode Selector in MAN position.
AIR SYSTEMS
Sec. 6.2 Page 62 737
Rev. 11/15/02 #41 Continental Flight Manual
Pressurization Mode Selector
AUTO – Aircraft pressurization system controlled automatically.
ALTN – Aircraft pressurization system controlled automatically in the ALTN
mode.
MAN – Aircraft pressurization controlled manually by Outflow Valve
Switch.
· Both auto system control circuits are bypassed.
Cabin / Flight Altitude Placard
· Used in the manual mode to determine cabin altitude.
737
Flight Manual Continental
AIR SYSTEMS
Sec. 6.2 LEP-1
Rev. 11/15/02 #41
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