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· When operating one pack from APU (both engine BLEED air switches
OFF), regulates to high flow.
HIGH –
· Pack regulates to high flow.
· Provides maximum flow rate on ground with APU BLEED air switch
ON.
AIR SYSTEMS
737 Sec. 6.2 Page 37
Flight Manual Continental Rev. 11/15/02 #41
A TRIM AIR Switch
ON – Trim air pressure regulating and shutoff valve signaled open.
OFF – Trim air pressure regulating and shutoff valve signaled closed.
B Air Temperature (TEMP) Indicator
· Indicates temperature at location selected with AIR TEMP source
selector.
C Recirculation (RECIRC) FAN Switches
OFF – Fan signaled OFF.
AUTO – Fan signaled on except when both packs operating with either pack
switch in HIGH.
D PACK Light
Illuminated (amber):
· Indicates pack trip off or failure of both primary and standby pack
controls.
· During Master Caution recall, indicates failure of either primary or
standby pack control. Extinguishes when Master Caution is reset.
TRIP RESET Switch
PUSH (if fault condition is corrected):
· Resets BLEED TRIP OFF, PACK and ZONE TEMP lights.
· Lights remain illuminated until reset.
AIR SYSTEMS
Sec. 6.2 Page 38 737
Rev. 11/15/02 #41 Continental Flight Manual
INTENTIONALLY LEFT BLANK
AIR SYSTEMS
737 Sec. 6.2 Page 39
Flight Manual Continental Rev. 11/15/02 #41
PRESSURIZATION SYSTEM DESCRIPTION
GENERAL
The aircraft is pressurized by bleed air supplied to, and distributed by, the air
conditioning system. Pressurization and ventilation are controlled by varying
the opening of outflow valves. A proportional relationship is maintained
between ambient and cabin pressure in climb or descent, and a maximum
differential is normally maintained in cruise.
There are two type of pressure control systems. The earlier Cabin Pressure
Control System (CPCS) and later Digital Cabin Pressure Control System
(DCPCS).
>>@ PRESSURIZATION OUTFLOW
Cabin air outflow is controlled by the main outflow valve, the forward outflow
valve, and the flow control valve. During pressurized flight the flow control
valve is closed, and the majority of the overboard exhaust is through the main
outflow valve. A small amount is also exhausted through toilet and galley vents,
miscellaneous fixed vents, and by seal leakage.
BCD PRESSURIZATION OUTFLOW
Cabin air outflow is controlled by the outflow valve and the overboard exhaust
valve. The outflow valve is the exhaust exit for the majority of the air circulated
through the passenger cabin.
The forward outflow valve found in prior models has been removed. The flow
control valve has been replaced with a motorized overboard exhaust valve.
>>@ FLOW CONTROL VALVE
The flow control valve opens to exhaust the cooling air from the E & E
compartment overboard during ground operation, unpressurized flight, and
pressurized flight below a cabin differential pressure of approximately 2.5 psi.
When the flow control valve closes, air is directed around the forward cargo
compartment liner for inflight heating.
AIR SYSTEMS
Sec. 6.2 Page 40 737
Rev. 11/15/02 #41 Continental Flight Manual
BCD OVERBOARD EXHAUST VALVE
The motorized overboard exhaust valve combines the functions of the flow
control valve and the forward outflow valve.
On the ground and in flight with low differential presure, the overboard exhaust
valve is open and warm air from the E & E bay is discharged overboard. In
flight, at higher cabin differential pressures, the overboard exhaust valve is
normally closed and exhaust air is diffused to the lining of the forward cargo
compartment.
B However, the overboard exhaust valve is driven open if either PACK switch
is in HIGH and the recirculation fan is off. This allows for increased ventilation
in the smoke removal configuration.
CD However, the overboard exhaust valve is driven open if either PACK
switch is in HIGH and the right recirculation fan is off. This allows for increased
ventilation in the smoke removal configuration.
>>@ FORWARD OUTFLOW VALVE
The forward outflow valve is the overboard discharge exit for air circulated
around the forward cargo compartment. The valve closes whenever the
recirculation fan is operating.
BCD FORWARD OUTFLOW VALVE
The forward outflow valve has been removed leaving the main outflow valve as
the exit for the majority of the air.
BCD MAIN OUTFLOW VALVE
The main outflow valve is the overboard exhaust exit for the majority of the air
circulated through the passenger cabin. Passenger cabin air is drawn through
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