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 C.  A ram air modulation system automatically regulates airflow through the ram air system during flight to minimize drag. The system also moves to provide maximum flow for ground operation and extends a deflector door to prevent slush injection when the airplane is moving on the ground.
 D.  AIRPLANES WITH RAM AIR EXHAUST LOUVERS (PRE-SB 21-1123); The ram air modulation system equipment includes the ram air inlet modulation panel, a deflector door, ram air exhaust louvers and their operating mechanism, a ram air actuator, a cable system for the ram air inlet modulation panel, a ram air controller, and a ram air temperature sensor (Fig. 2). Air cycle system equipment includes a turbofan, a turbofan valve, and the related ducting for routing pressurized air to run the turbofan.
 E.  AIRPLANES WITHOUT RAM AIR EXHAUST LOUVERS (POST-SB 21-1123); The ram air modulation system equipment includes the ram air inlet modulation panel, a deflector door, a ram air actuator, a cable system for the ram air inlet modulation panel, a ram air controller, and a ram air temperature sensor (Fig. 2). Air cycle system equipment includes a turbofan, a turbofan valve, and the related ducting for routing pressurized air to run the turbofan.
 2.  Ram Air Inlet_____________
 A.  The ram air inlet consists of a scoop, a modulation panel, and a deflector door. A scoop is located on each side of the airplane at the forward end of the wing to body fairing. The scoop forms the entry for the ram air ducts.
 B.  The ram air inlet modulation panel is made up of two panel sections. The forward end of the forward panel is hinged to structure and its aft end is hinged to the forward end of the aft panel section. The aft end of the aft panel section is equipped with rollers which allow movement forward and aft. Two cranks with rollers attached move the forward end of the aft panel inboard or outboard to open or close the inlet. The cranks are attached to a shaft which is operated by the ram air actuator through a cable system.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 C.  The deflector door is hinged at its forward end to airplane structure and is shaped to fit in the scoop when retracted to prevent interference with ram airflow into the ram air ducts. A mechanism connected to the modulation panel cable system causes the deflector door to be extended when the airplane is on the ground and then to fair on takeoff. The deflector door minimizes the possibility of foreign material entering the ram air system when the airplane is moving on the ground.
 3.  Ram Air Ducts
_____________
 A.  The ram air ducts are contained in the ram air duct cavity and the equipment bay. A web between the two compartments helps support the heat exchangers and the inlet ducts. The ram air exit ducts connect to the inboard side of the heat exchangers then extend to an outlet just aft of the equipment bay doors. A turbofan is included between duct sections immediately forward of the outlet. Access to the entire ram air duct system is obtained by opening the ram air duct access door and the air conditioning equipment bay doors.
 4.  Ram Air Actuator
________________
 A.  AIRPLANES WITH RAM AIR EXHAUST LOUVERS (PRE-SB 21-1123); The ram air actuator is a 115-volt ac motor-operated linear actuator. It operates in either direction and may be stopped at any position between full extend and full retract. The actuator is used to modulate the ram air inlet modulation panel and the ram air exhaust louvers, and moves the deflector door.
 B.  AIRPLANES WITHOUT RAM AIR EXHAUST LOUVERS (POST-SB 21-1123); The ram air actuator is a 115-volt ac motor-operated linear actuator. It operates in either direction and may be stopped at any position between full extend and full retract. The actuator is used to modulate the ram air inlet modulation panels and move the deflector door.
 C.  AIRPLANES WITH RAM AIR EXHAUST LOUVERS (PRE-SB 21-1123); The ram air actuator is controlled by relays in the Air Conditioning Accessory Unit and the ram air controller. The control is automatic and depends on whether airplane is on the ground, inflight with flaps extended or inflight with flaps positioned full up. When airplane is inflight with flaps full up, temperature of the air in the air cycle machine compressor discharge is sensed by the ram air controller to govern actuator position. There are four position switches in the actuator which work with the control system to obtain proper positioning of the inlet panel and the exhaust louvers. The ram air actuator is mounted on the aft bulkhead of the ram air duct cavity.
　
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