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@ AUTO FAIL Light (amber)
Illuminated – Automatic pressurization control failure.
· Control automatically transfers to standby mode.
A Off Schedule Descent Light (amber)
Illuminated – Aircraft descends before reaching the planned cruise flight
altitude set in the flight altitude indicator.
B Pressurization Mode Selector
AUTO – Aircraft pressurization system controlled automatically.
CHECK – Tests auto failure function of AUTO system.
C Flight / Ground Switch
GRD – Drives pressurization outflow valve full open at controlled rate and
depressurizes the aircraft when on the ground.
FLT – On the ground, pressurizes the cabin to .1 psid (approximately 200
feet below airport elevation).
· After takeoff, cabin pressure automatically controlled in climb and
descent as function of aircraft altitude.
· In cruise, cabin pressure held constant.
AIR SYSTEMS
Sec. 6.2 Page 50 737
Rev. 11/15/02 #41 Continental Flight Manual
CABIN PRESSURE CONTROL SYSTEM (CPCS) CONTROLS AND
INDICATORS – STANDBY OPERATION >@
< STANDBY Light (green)
Illuminated – Pressurization system operating in standby mode.
= Cabin Rate Selector
DECR – Cabin altitude rate of change equals 50 ft/min.
INCR – Cabin altitude rate of change equals 2000 ft/min.
(Index) – Cabin altitude rate of change equals 300 ft/min.
> Cabin Altitude Indicator
· Indicates selected cabin altitude.
AIR SYSTEMS
737 Sec. 6.2 Page 51
Flight Manual Continental Rev. 11/15/02 #41
? Cabin Altitude Selector
ROTATE – To select desired cabin altitude.
· Large diameter control sets nearest 1000 feet.
· Small diameter control sets nearest 10 feet.
@ Pressurization Mode Selector
STBY – Aircraft pressurization system controlled through the standby mode.
· Requires cabin altitude rate of change and cabin altitude selections.
· Automatic mode bypassed.
A Flight / Ground Switch
GRD – Drives outflow valve open at rate selected by Cabin Rate Selector.
FLT – Pressurizes aircraft at rate selected by Cabin Rate Selector to cabin
altitude selected on Cabin Altitude Indicator (normally 200 feet below
takeoff field elevation).
B Cabin / Flt Altitude Placard
Used to determine the setting for cabin altitude.
Example: In the event automatic pressurization mode is inoperative, and a
flight is planned at 22,000 feet using the standby mode, set
1900 feet in the Cabin Altitude Indicator after takeoff.
AIR SYSTEMS
Sec. 6.2 Page 52 737
Rev. 11/15/02 #41 Continental Flight Manual
CABIN PRESSURE CONTROL SYSTEM (CPCS) CONTROLS AND
INDICATORS – MANUAL OPERATIONS >@
< MANUAL Light (green)
Illuminated – Pressurization system operating in manual mode.
= Outflow Valve Position Indicator
· Indicates position of main cabin outflow valve.
· Operates in all modes.
> Outflow Valve Switch (spring-loaded to center)
OPEN – Opens main cabin outflow valve electrically.
CLOSE – Closes main cabin outflow valve electrically.
? Pressurization Mode Selector
MAN – Aircraft pressurization controlled manually by Outflow Valve
Switch.
AC – Outflow valve operates from AC power.
DC – Outflow valve operates from DC power.
· All auto and standby circuits bypassed.
AIR SYSTEMS
737 Sec. 6.2 Page 53
Flight Manual Continental Rev. 11/15/02 #41
DIGITAL CABIN PRESSURE CONTROL SYSTEM (AIRCRAFT WITH
DCPCS)
Outflow Valves
>@ The main outflow valve is actuated by DC motors in any operating
mode. The forward outflow valve closes automatically to assist in maintaining
cabin pressure when the main outflow valve is almost closed or when the
recirculation fan is operating.
BCD The forward outflow valve found in prior models has been removed.
The flow control valve has been replaced with a motorized overboard exhaust
valve which combines the functions of the flow control valve and forward
outflow valve.
Digital Cabin Pressure Controller
Controls cabin altitude in the following modes:
AUTO - Automatic pressurization control; the normal mode of operation.
Uses brushless DC motor.
ALTN - Automatic pressurization control; the alternate mode of operation.
Uses brushless DC motor.
MAN - Manual control of the system using DC motor.
>@ In the automatic and alternate modes of operation, aircraft altitude is
provided by the Air Data Computers (ADCs). The ADCs receive barometric
corrections from the Captain’s and First Officer’s altimeters.
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737 FLIGHT MANUAL 737飞行手册3(61)
