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temperature controller fails, the associated trim air modulating valve closes.
The temperature selectors are still operable but the temperature output will be
an average of the FWD CAB and AFT CAB temperature selectors.
Any failure of the Trim Air system will cause the packs to revert to independent
operation. If the CONT CAB (flight deck) trim air is lost, the left pack will be
controlled by the CONT CAB temperature selector and right pack will be
controlled to provide air at a temperature to satisfy the demand of the passenger
cabin zone requiring the coolest air.
AIR SYSTEMS
737 Sec. 6.2 Page 21
Flight Manual Continental Rev. 11/15/02 #41
If the Trim Air for a passenger cabin zone is lost, the right pack will supply air
at an averaged temperature for the FWD CAB and AFT CAB temperature selectors.
The Electronic Controllers will ignore the setting of any Temperature Selector
which has been switched OFF. If all three selectors are switched OFF, the Left
Pack will output air to maintain 75°F (24°C) and the Right Pack will output air
to maintain 65°F (18°C) as measured at the pack temperature sensors.
CD AIR CONDITIONING DISTRIBUTION SCHEMATIC
AIR SYSTEMS
Sec. 6.2 Page 22 737
Rev. 11/15/02 #41 Continental Flight Manual
RECIRCULATION FAN
>>@B The recirculation fan system reduces the air conditioning pack load
and the engine bleed air demand. The air for the recirculation fan is exhaust air
from the main cabin and electrical equipment bay collected in a shroud located
above the forward cargo compartment. This air is filtered and recirculated to
the mix manifold. The fan is driven by an AC motor. Fan operates with switch
in AUTO except when both packs are on and one or both are in HIGH.
When the fan shuts down as a result of this action, the forward outflow valve
>>@, motorized overboard exhaust valve B, will open to assure continued
air flow around the forward cargo compartment.
CD The dual recirculation fan system reduces the air conditioning pack load
and the engine bleed air demand. The air for the right recirculation fan is
exhaust air from the main cabin and electrical equipment bay collected in a
shroud located above the forward cargo compartment. The left recirculation fan
draws air from the air distribution compartment where the mix manifold is
located. This compartment is connected to the area under the floor aft of the
wheel well via a tunnel system, which enables the fan to receive adequate air
supply. The air for the fans is filtered and recirculated to the mix manifold. The
fans are driven by AC motors. The fans normally operate with the switches in
AUTO. Fan(s) operation is subject to the conditions listed in the following table.
AIR SYSTEMS
737 Sec. 6.2 Page 23
Flight Manual Continental Rev. 11/15/02 #41
BCD OVERBOARD EXHAUST VALVE
CD
RECIRC FAN
SW POSITION PACK OPERATION
LEFT RECIRC
FAN
RIGHT
RECIRC FAN
OFF ANY OFF OFF
LEFT PACK LOW FLOW
RIGHT PACK LOW FLOW
ON ON
LEFT PACK HIGH FLOW
RIGHT PACK LOW FLOW
ON ON
LEFT PACK LOW FLOW
RIGHT PACK HIGH FLOW
ON ON
G
R
O
U
N
D LEFT PACK HIGH FLOW
RIGHT PACK HIGH FLOW
OFF ON
LEFT PACK LOW FLOW
RIGHT PACK LOW FLOW
ON ON
LEFT PACK HIGH FLOW
RIGHT PACK LOW FLOW
OFF ON
LEFT PACK LOW FLOW
RIGHT PACK HIGH FLOW
OFF ON
A
U
T
O
A
I
R
LEFT PACK HIGH FLOW
RIGHT PACK HIGH FLOW
OFF OFF
BCD Motorized Overboard Exhaust Valve
Low cabin pressure – Open
High cabin pressure – Closed
Both packs on High – Open
AIR SYSTEMS
Sec. 6.2 Page 24 737
Rev. 11/15/02 #41 Continental Flight Manual
>>@ FORWARD CARGO COMPARTMENT
The forward cargo compartment is warmed in flight when more than 2.5 psi
pressure differential exists. Air from the E & E compartment flows up and
around the forward cargo compartment lining. The recirculation fan maintains
this warming air flow. When the recirculation fan is off, the forward outflow
valve opens to ensure this warm air flow (except when closed in order to
maintain pressurization).
BCD FORWARD CARGO COMPARTMENT
The forward cargo compartment utilizes a motorized overboard exhaust valve in
place of the flow control valve, while eliminating the forward outflow valve.
When the overboard exhaust valve is closed, exhaust air from the equipment
cooling system is also diffused to the lining of the forward cargo compartment
for additional inflight heating.
When the right recirculation fan shuts down, according to the above operation
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