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No. 3 windows. Each of these outlets can be opened or closed as desired by
turning a slotted adjusting screw.
There is also a dual purpose valve behind the rudder pedals of each pilot. These
valves provide air for warming the pilots’ feet and for defogging the inside of
the No. 1 windshields. Each valve is controlled by knobs located on the
Captain’s and First Officer’s panel, respectively.
PASSENGER CABIN
The passenger cabin air supply distribution system consists of the mix manifold,
sidewall risers, and an overhead distribution duct.
Sidewall risers go up the right and left wall of the passenger cabin to supply air
to the overhead distribution duct. The overhead distribution duct routes
conditioned air to the passenger cabin. It extends from the forward to the aft
end of the ceiling along the aircraft centerline and also supplies the sidewall
diffusers.
AIR SYSTEMS
737 Sec. 6.2 Page 19
Flight Manual Continental Rev. 11/15/02 #41
>>@B AIR CONDITIONING DISTRIBUTION SCHEMATIC
3737706
RECIRC FAN
OVHT
TEST
C LO SE
O FF O F F
O N O N
1 2
O F F O F F
O F F
AU TO AU T O
O PEN
T RIP
RES ET
A UT O
HI G H AU TO H IG H
APU
L PACK ISOLATION
VALVE
BLEED
R PACK
0 100
80
40 60
20
PSI
W IN G
AN T I
I CE
W IN G
AN T I
ICE
PA CK
T R IP O FF
PAC K
T RI P O F F
BL EED
T RI P O F F
B LEED
T R IP O FF
CONTCABIN AIRTEMP PASSCABIN
AIRMIX
VALVE
AIRMIX
VALVE
PASS
CABIN
SUPPLY
DUCT
CO
LD
CO
LD
HO
T
HO
T
20
40 60
80
100
°C
AUTO AUTO
COOL COOL
COOL COOL
WARM WARM
WARM WARM
NO AL NO AL
OFF OFF
MANUAL MANUAL
DUAL
BLEED
DRIVES MIX VALVES FULL COLD
TO RIGHT SIDEWALL
RISER
LEFT SIDEWALL
RISER
RIGHT PACK TRIP OFF
RIGHT DUCT OVERHEAT
TO
RIGHT
PACK
VALVE
OVERRIDE
CONDITION:
INFLIGHT
FROM RIGHT PACK PACKS ON
MIX
VALVES
COLD HOT
FROM LEFT PACK
HOT AIR
COLD AIR
CONDITIONED AIR
MIX
MANIFOLD
LEFT DUCT
OVERHEAT
LEFT PACK
TRIP OFF
RECRIC
FAN
FILTER
AIR SYSTEMS
Sec. 6.2 Page 20 737
Rev. 11/15/02 #41 Continental Flight Manual
CD TRIM AIR SYSTEM OPERATION
Due to the length of the aircraft, the air conditioning system is divided into three
zones. These include the CONT CAB (flight deck), FWD CAB, and AFT
CAB. Adjusting the individual selector sets desired zone temperature. With the
desired temperatures selected, the packs produce an air temperature that will
satisfy the zone that requires the most cooling. In order to prevent the
remaining two zones from receiving conditioned air that is too cool for the
selected temperatures, trim air (bleed air) is mixed with the air from the
manifold to regulate it to the desired temperature.
With the TRIM AIR switch in the ON position, the trim air pressure regulator and
shutoff valve are open. This allows bleed air ducted from upstream of the packs
to be directed to three trim air modulating valves, one for each zone. Two
separate electronic controllers control the modulating valves. The right
controller provides for the modulation of the forward cabin and acts as the
primary controller for the flight deck. The left controller modulates the valve
for the aft cabin and acts as backup controller for the flight deck. The
controllers will allow the valves to open when necessary to provide bleed air for
mixing with the conditioned air to maintain desired zone temperatures.
When the TRIM AIR switch is OFF, the left pack controller provides air at the
temperature selected for the flight deck zone and the right pack supplies air at
the temperature requested by the passenger cabin zone demanding the coolest
air. If all temperature selectors are positioned OFF, the left pack will maintain a
fixed temperature of 75°F and the right pack will be controlled to maintain a
fixed temperature of 65°F, measured at pack discharge.
The system also incorporates zone supply duct overheat protection. If a supply
duct overheats, the associated amber ZONE TEMP and MASTER CAUTION lights will
illuminate, and the trim air modulating valve closes.
If the CONT CAB ZONE TEMP light illuminates after master caution RECALL, a
failure of the Electronic Controllers is indicated. If a passenger zone
　
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