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A 737-300/400/500MAINTENANCE MANUAL
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 ALL  ú ú 03 Page 4 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 B.  A gasper outlet provides each crewmember and passenger a method for ventilating his local area. An adjustable nozzle at each station allows the individual a choice from no airflow to maximum airflow from the distribution system.
 C.  A recirculation fan attached to the main distribution manifold recirculates conditioned air from around the forward cargo compartment into the distribution system manifold where the air mixes with the air supplied by the air conditioning packs.
 3.  Pressurization Control System_____________________________
 A.  The pressurization control system includes pressurization control, pressurization relief valves, and pressurization indicating and warning.
 B.  Cabin pressure is controlled by positioning a cabin pressurization outflow valve to meter cabin air exhaust. The valve operates electrically from three control systems. The control systems are AUTO, STANDBY and MANUAL. AUTO mode provides automatic pressure control of cabin altitude and rate of altitude change based on settings made to the pressurization control panel (P5) of flight and landing altitudes. STANDBY mode provides semi-automatic control of cabin altitude and rate of altitude change based on settings of the pressurization control panel (P5) of cabin altitude and rate selected. MANUAL mode provides control of cabin altitude and rate of altitude change by the selection of MAN AC or MAN DC and operation of a three position (CLOSE-OFF-OPEN) manually operated toggle switch. Normal control is from the AUTO system with the STANDBY system acting as a backup. The MANUAL system functions as an override over the AUTO and STANDBY systems.
 C.  Pressurization relief valves include two safety relief valves, which prevent overpressurizing the airplane, and a vacuum relief valve which prevents pressure inside the airplane becoming appreciably less than ambient. In addition to the relief valves, pressure equalization valves are installed in both cargo compartments to provide a quick method of allowing cargo compartment pressure to vary, within limits, with cabin pressure. Blowout panels are used in both cargo compartments to protect against a sudden differential in pressure between the cargo compartment interior and exterior.
 D.  Indicators are provided to allow monitoring cabin altitude, differential pressure, and rate of pressure change (21-33-00/001). A cabin altitude warning system sounds a horn if cabin altitude exceeds approximately 10,000 feet.
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 ALL  ú ú 03 Page 5 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 4.  Cooling
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 A.  All cold air required for air conditioning is provided by air conditioning packs. Passing bleed air through a primary heat exchanger, an air cycle machine, and a secondary heat exchanger cools the air sufficiently to handle any cooling situation required. A ram air system provides coolant air for the heat exchangers. A ram air modulation control system automatically regulates the supply of coolant air during flight to obtain required cooling with minimum aerodynamic drag from the system. A turbofan draws air through the system for ground operation and in flight when flaps are extended. A water separator removes excess moisture from the cooled air which is then passed through a water injector and sprayed on the secondary heat exchanger core to aid in cooling bleed air. Various thermal switches, thermostats, sensors, and valves are included to provide automatic protection and warning of an air malfunction.
 5.  Temperature Control (AMM 21-61-00/001)
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 A.  Temperature of the air entering the distribution systems to the passenger and control cabins is regulated by positioning mix valves. The mix valves proportion hot bleed air with cold air from the air conditioning packs to provide air conditioned comfort in the passenger and control cabin. There is one mix valve for each air cycle system. Two sets of controls on the forward overhead panel provide automatic or manual control and monitoring for each system. The control cabin controls the left air cycle system and the passenger cabin controls the right air cycle system. Each control system consists of a temperature controller, temperature selector, temperature indicator, temperature sensors, overheat control and warning light, mix valve, and mix valve position indicator.
　
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