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table, the overboard exhaust valve opens venting the E & E compartment
overboard. The forward cargo compartment continues to stay warm by air from
the forward cabin. This air flows through the floor registers, down the sides of
the forward cargo compartment and backwards to the overboard exhaust valve.
CONDITIONED AIR SOURCE CONNECTION
A ground air conditioning source may be connected to the mix manifold to
distribute preconditioned air throughout the aircraft.
AIR SYSTEMS
737 Sec. 6.2 Page 25
Flight Manual Continental Rev. 11/15/02 #41
EQUIPMENT COOLING – EXHAUST FAN
EFIS equipment, if installed, circuit breaker and instrument panels in the flight
deck and electronic equipment in the E & E compartment are cooled by the
equipment cooling system. Warm air, from the equipment, is ducted away by
the selected AC powered exhaust fan. On the ground, or with the cabin
differential pressure less than 2.5 psi, the exhaust fan air is blown through a
flow control valve / overboard exhaust valve and out the bottom of the aircraft.
With increasing airflow at greater cabin differential pressures, the flow control
valve / overboard exhaust valve closes. Warm air from the electronic
equipment is then diffused around the forward cargo compartment.
EQUIPMENT COOLING SCHEMATIC
AIR SYSTEMS
Sec. 6.2 Page 26 737
Rev. 11/15/02 #41 Continental Flight Manual
>@BCD EQUIPMENT COOLING – SUPPLY FAN
On EFIS equipped aircraft, the supply fan draws cool air from the passenger
cabin and furnishes it to the instrument panels.
Additional thermal switches are located in the E & E compartment.
Loss of air flow due to failure of an equipment cooling fan results in illumination
of the related equipment cooling OFF light. Selecting the alternate fan should
restore air flow and extinguish the OFF light within approximately 5 seconds.
If an overtemperature occurs on the ground, alerting is provided through the
crew call horn in the nose wheel well.
AIR SYSTEMS
737 Sec. 6.2 Page 27
Flight Manual Continental Rev. 11/15/02 #41
EQUIPMENT COOLING PANEL
< Equipment (EQUIP) COOLING SUPPLY Switch
NORM – Normal cooling supply fan activated.
ALTN – Alternate cooling supply fan activated.
= Equipment Cooling Supply OFF Light
Illuminated (amber) – No airflow from selected cooling supply fan.
> Equipment (EQUIP) COOLING EXHAUST Switch
NORM – Normal cooling exhaust fan activated.
ALTN – Alternate cooling exhaust fan activated.
? Equipment Cooling Exhaust OFF Light
Illuminated (amber) – No airflow from selected cooling exhaust fan.
AIR SYSTEMS
Sec. 6.2 Page 28 737
Rev. 11/15/02 #41 Continental Flight Manual
>>@B BLEED AIR INDICATORS
< DUAL BLEED Light (amber)
Illuminated – APU bleed air valve OPEN and No. 1 engine bleed switch ON,
or No. 2 engine bleed switch ON, APU bleed air valve and isolation valve
OPEN.
= Pneumatic Duct Pressure Indicator
· Indicates pressure in the L and R (left and right) pneumatic ducts.
> WING ANTI-ICE Schematic Decal
· Depicts the relationship of bleed air for wing anti-ice to the pneumatic
system.
AIR SYSTEMS
737 Sec. 6.2 Page 29
Flight Manual Continental Rev. 11/15/02 #41
? WING-BODY OVERHEAT Light (amber)
· Left Light Illuminated – Indicates overheat from a bleed air duct leak
in the left engine strut, left wing leading edge, left air conditioning bay,
keel beam or APU bleed air duct.
· Right Light Illuminated – Indicates overheat from a bleed air duct leak
in the right engine strut, right wing leading edge or right air
conditioning bay.
@ BLEED TRIP OFF Light (amber)
Illuminated – Indicates excessive engine bleed air temperature or pressure.
Associated engine bleed air valve closes automatically and requires reset.
Note: Lights remain illuminated until the TRIP RESET switch is pushed.
AIR SYSTEMS
Sec. 6.2 Page 30 737
Rev. 11/15/02 #41 Continental Flight Manual
>>@B TEMPERATURE CONTROLS
< Air Temperature Source Selector
SUPPLY DUCT – Selects main distribution supply duct sensor for
Temperature Indicator.
PASS CABIN – Selects passenger cabin.
= Temperature Indicator
· Indicates temperature at location selected with Air Temperature
Source Selector.
> Passenger Cabin AIR MIX VALVE Indicator
· Indicates position of air mix valves.
· Controlled automatically with Passenger Cabin Temperature Selector
in AUTO.
· Controlled manually with Passenger Cabin Temperature Selector in
　
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