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cycle. An overheat condition causes the pack valve to close and the PACK TRIP
OFF light to illuminate.
AIR SYSTEMS
Sec. 6.2 Page 14 737
Rev. 11/15/02 #41 Continental Flight Manual
>>@ AIR CONDITIONING PACK SCHEMATIC
AIR SYSTEMS
737 Sec. 6.2 Page 15
Flight Manual Continental Rev. 11/15/02 #41
RAM AIR SYSTEM
The ram air system is used to provide cooling for the heat exchangers in the air
conditioning system. Operation of the system is automatic.
During flight, the ram air modulating system automatically regulates airflow
through the system. A temperature sensor in the air cycle machine (ACM)
compressor discharge duct controls airflow through the system. The sensor
modulates the mechanically linked ram door and exhaust louvers to maintain the
required cooling airflow across the heat exchangers. BCD Louvers are not
installed. In normal cruise, the ram door will modulate between a normal open
and normal closed position.
When on the ground or during slow flight with the flaps not fully retracted, the
ram door moves to the full open position for maximum cooling. The RAM DOOR
FULL OPEN light illuminates whenever the ram door is fully open.
DEFLECTOR DOOR
A deflector door is installed forward of the ram air inlet doors to prevent slush
ingestion prior to liftoff and after touchdown. The deflector door extends when
activated electrically by the air-ground safety sensor.
TURBOFAN
>>@
A turbofan is located in each ram air exit duct just upstream of the exit louvers.
It augments the ram airflow on the ground, or during slow flight with the flaps
not fully retracted. The fan operates pneumatically using bleed air. It is
activated electrically, when the pack is on, by the air-ground safety sensor or
flap limit switch.
AIR SYSTEMS
Sec. 6.2 Page 16 737
Rev. 11/15/02 #41 Continental Flight Manual
>>@ RAM AIR SYSTEM SCHEMATIC
RAM DOOR
BEFORE TAKEOFF
(FULL OPEN)
AFTER TAKEOFF
(NORMAL OPEN)
CRUISE
(FULL CLOSED)
AIRPLANE
ATTITUDE
FLAP
POSITION
TURBO FAN
VALVE
POSITION
FLAP
POSITION
RAM DOOR
FULL OPEN
LIGHT
BEFORE
TAKEOFF UP OR DOWN OPEN EXTENDED ILLUMINATED
TAKEOFF/
CLIMB DOWN OPEN RETRACTED ILLUMINATED
BEFORE
LANDING DOWN OPENS RETRACTED ILLUMINATED
TOUCH
DOWN DOWN OPEN EXTENDED ILLUMINATED
CLIMB UP CLOSES RETRACTED EITHER
CRUISE UP CLOSES RETRACTED EXTINGUISHED
RAM DOOR
FULL OPEN
HOT AIR
HEAT EXCHANGER
COOLED AIR
COLD AIR
RAM AIR
CONDITION:
ON GROUND
PACK ON
RAM AIR INLET
DEFLECTOR
DOOR
RAM DOOR
FWD
TO WATER SEPARATOR
ACM
RAM AIR
SENSOR
COLD
MIX
VALVE
SECONDARY
HEAT
EXCHANGER
PRIMARY
HEAT
EXCHANGER
RAM AIR
CONTROLLER
RAM AIR
ACTUATOR
RAM AIR
EXHAUST
LOUVERS
TURBOFAN
TURBOFAN
VALVE
3737705
AIR SYSTEMS
737 Sec. 6.2 Page 17
Flight Manual Continental Rev. 11/15/02 #41
BCD AIR CYCLE MACHINE FAN
BCD Adequate air flow across the heat exchangers is assured when the
aircraft is on the ground or in flight by a fan attached to the ACM.
A spring loaded fan bypass valve opens when ram air pressure is more than fan
air pressure. This valve serves as a check valve when the ACM fan air pressure
exceeds ram air pressure.
AIR SYSTEMS
Sec. 6.2 Page 18 737
Rev. 11/15/02 #41 Continental Flight Manual
AIR CONDITIONING DISTRIBUTION
Conditioned air is collected in the mix manifold. The temperature of the air is
directly related to the setting of the CONT CABIN and PASS CABIN temperature
selectors.
Overheat detection is provided by temperature sensors located downstream of
the packs. An overheat condition causes the appropriate mix valves to drive full
cold and the DUCT OVERHEAT light to illuminate. A temperature higher than the
duct overheat causes the appropriate pack valve to close and the PACK TRIP OFF
light to illuminate.
FLIGHT DECK
Since the flight deck requires only a fraction of the air supply provided by the
left pack, most of the left pack air output is mixed with the right pack supply and
routed to the passenger cabin.
Conditioned air for the flight deck branches into several risers which end at the
floor, ceiling, and foot level outlets. Air diffusers on the floor under each seat
deliver continuous air flow as long as the manifold is pressurized.
Overhead diffusers are located on the flight deck ceiling, above and aft of the
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